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Wireless and Microwave Technology Conference (WAMICON), 2010 IEEE 11th Annual

Date 12-13 April 2010

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Displaying Results 1 - 25 of 58
  • Coupling between waveguide and hemispherical open resonator

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2046 KB) |  | HTML iconHTML  

    The hemispherical open resonator feeding by the rectangular waveguide was analyzed by using the modal analysis method. The open resonator was excited by the rectangular waveguide through a narrow slot, with a complete analysis of all the relevant modes in the waveguide and the open resonator, the coupling coefficients according to the difference width slots were derived among Ka waveband, further more, the coupling coefficients of a slot at different eigen frequency were calculated and were compared to experimental results. View full abstract»

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  • Broadband characterization of planar whispering-gallery-mode dielectric resonators using a simple experimental setup

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3945 KB) |  | HTML iconHTML  

    A simple and cost-effective experimental setup for measuring the transmission coefficient of whispering-gallery (WG) mode dielectric resonators up to the mm-wave band is presented. The proposed setup consists of a sweep generator, a spectrum analyzer and a PC with a General Purpose Interface Bus (GPIB). The major advantage of such arrangement lies in the ease of measurement without standard calibration procedures as well as its cost-effectiveness. Using this setup, two WG resonators have been experimentally characterized over the K- and Ka-bands. The obtained results are in a good agreement with those obtained from a calibrated vector network analyzer. View full abstract»

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  • Integrated 915MHZ OFC SAW sensors

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (8159 KB) |  | HTML iconHTML  

    The purpose of this paper is to present recent results on the integration of SAW orthogonal frequency coded (OFC) wireless sensors into a unified sensor target at 915 MHz. Current proof of concept embodiments at 250 MHz and 915 MHz have been successful in demonstrating a functional sensor design and working interrogation system. However, previous work has done little to optimize the sensor platform into a single package containing the SAW device, matching network, and antenna. Through the work presented a more ubiquitous sensor network will be achieved by significantly reducing the tag footprint while optimizing device performance. The following will first briefly review the OFC device concept and present current device embodiments at the frequency of interest. An overview of current tag antenna and matching network design is presented next as a basis for the work to follow. Finally, a compact sensor target will be outlined based on optimizing trade-offs in device range and overall tag size. View full abstract»

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  • Hardware realization of a low complexity fading filter for Multipath Rayleigh fading simulator

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5544 KB) |  | HTML iconHTML  

    A low-complexity high performance Rayleigh fading simulator, and its Field Programmable Gate Array (FPGA) implementation are presented. This proposed method is a variant of the method of filtering of the white Gaussian noise where the filter design is accomplished in the analog domain and transferred into digital domain. The proposed model is compared with improved Jakes' model [1], auto-regressive filtering [2] and IDFT [3] techniques, in performance and computational complexity. Proposed method outperforms AR(20) filter and modified Jakes' generators in performance. Although IDFT method achieves the best performance, it brings a significant cost in storage and is undesirable. The proposed method achieves high performance with the lowest complexity, and its performance has been verified on Virtex4 and Spartan3e FPGA platforms. Our fixed-point Rayleigh fading-channel simulator utilizes only 2% of the configurable slices, 1% of the Look-Up-Table (LUT) resources and 3% of the dedicated multipliers on a Xilinx Virtex4 - xc4vsx35 FPGA platform. View full abstract»

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  • WiMAX bandpass filter using hybrid microstrip Defected-Ground-Structure

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2581 KB) |  | HTML iconHTML  

    A novel and compact WiMAX microstrip bandpass filter is proposed. The filter employs a very wide bandwidth from 2 to 11 GHz under NLOS environment of the IEEE 802.16-2004 standard, and with a 3-dB fractional bandwidth of greater than 138%. The proposed hybrid WiMAX band-pass filter had return loss more than 17 dB in the passband, and also demonstrated a reject band from 12.4 GHz to more than 20 GHz at -20 dB. View full abstract»

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  • Investigation in open circuited metal lines embedded in defected ground structure and its applications to UWB filters

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6797 KB) |  | HTML iconHTML  

    A novel method for notch implementation in ultra-wideband (UWB) bandpass filter using open circuited metal lines embedded in a defected ground structure (DGS) is proposed. Distinct from traditional notch implementation, the proposed method uses the additional metal lines with half waveguide length embedded in defected ground structure to produce additional notch band behavior based on the DGS bandpass behavior. Furthermore, the equivalent circuit model of the proposed UWB BPF with notch implementation is established for explaining the circuit behaviors more explicitly. In this way, the proposed circuit has a very small size, only amounting to 0.41 by 0.22 guided wavelength at the center frequency of 6.85 GHz. The experimental filter has a notch band frequency of 5.5 GHz, with two observable attenuation poles at 1.65 and 11.36 GHz, respectively. The measured BPF insertion loss is less than 1.0 dB throughout the passband of 3.1 to 10.6 GHz, and the variation of group delay is less than 0.2 ns in this band, except for the notched band. View full abstract»

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  • Design of a w-band monopulse comparator based on E- and H-plane waveguide couplers

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2896 KB) |  | HTML iconHTML  

    In this paper, we present the design of a W-band waveguide monopulse comparator based on E- and H-plane couplers. E- and H-plane couplers are of 180-degree 3-dB type and consisted of a coupling section and dielectric-slab phase delayer. A monopulse comparator is realized using two E- and two H-plane couplers in tandem. The designed comparator shows amplitude balance within ±0.5 dB and phase balance within +4/-8 degrees, reflection coefficient less than -15 dB and isolation greater than 20 dB at 90-98 GHz. View full abstract»

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  • Enhancement of signal integrity for multi-module memory bus by particle swarm optimization

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5241 KB) |  | HTML iconHTML  

    In this paper, the characteristic impedance of transmission line and on-die termination (ODT) for Double Data Rate (DDR3) multi-module memory bus were be effectively enhanced signal integrity by particle swarm optimization (PSO) algorithm. The bionic characteristic of PSO has good performance of search for macrocosm and fast convergence. In this case, the equivalent model of the circuit considers that CPU/MCH and two dual in-line memory modules (DIMMs) connect by five segments of transmission lines. And the fitness function defined by the reflection coefficient for drive end is the small the better and the transmission coefficient for receiving end is the large the better. Finally, we verify enhancement of signal integrity for the DDR3 by simulating eye diagram. View full abstract»

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  • Noise analysis for noncontact vital sign detectors

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2403 KB) |  | HTML iconHTML  

    A method for analyzing the overall noise performance of vital sign detectors is introduced. For demonstration purpose, the noise analysis on a quadrature direct-conversion vital sign detector is performed. The detector is divided into three sub-systems including RF Front-end amplifiers, mixer with LO, and baseband amplifiers. The noise characteristics of the sub-systems are studied individually and combined to form the overall noise evaluation of the detector. The study on mixer sub-system results in a key design consideration of mixer. The signal-to-noise ratio at the sampler input is defined as the output SNR and is used to measure the overall noise performance of the vital sign detectors. The effect of output SNR on vital sign detection is presented. Tradeoff between output SNR and detection distance is verified by the experimental results. View full abstract»

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  • Novel chip antenna with eight spiral monopole slot structures for DVB-H applications

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (10705 KB) |  | HTML iconHTML  

    A printed chip type antenna using monopole spiral slot structures with system ground for digital video broadcasting-handheld (DVB-H) signal reception in the UHF band is proposed. By utilizing the eight quarter-wavelength spiral slot l a radiator in configuration. In this case, the occupied area of the monopole slot chip antenna on the system circuit board can be further reduced. Antenna has a compact size of 20 × 20 × 0.8mm3. It size is minimized so that it can be easily installed to mobile handset. The simulated and measured results show that the impedance bandwidth covers the DVT (470~860 MHz) band with return loss |S11| than 5. The antenna can get omnidirectional radiation pattern in the whole frequency band. The measurement result is agree with simulation. View full abstract»

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  • A high-frequency power amplifier using GaN power cell technology

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4406 KB) |  | HTML iconHTML  

    This paper describes the design, simulation, packaging and measurement of a 10-GHz Gallium Nitride power amplifier (PA). GaN transistors or power cells with maximum-available gain of 8.7 dB at 10 GHz were used in the design. The power cells were manufactured using a 0.8-¿m HFET 9-layer process, while the PA's DC bias lines, input and output matching circuits were built on a low-cost Miniature-Hybrid MIC chip. A flip-chip technology was used to integrate the power cells with the rest of the PA circuit. A class-AB PA was designed to provide an output power of up to 39 dBm at 10 GHz, while maintaining a power-added efficiency (PAE) of 31%. The measurements of the PA are presented and issues related to packaging and measurements are also discussed in the paper. View full abstract»

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  • Truly differential RF and microwave front-end design

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4438 KB) |  | HTML iconHTML  

    New design methodology for truly differential RF and microwave front-ends has been presented in this paper. Baluns are avoided using this design methodology, while achieving differential signaling for high noise immunity. A case study on an ultra-wide band RF front-end in the frequency band 6-9 GHz has been performed using the new design methodology, indicating that both wide bandwidth and high performance can be achieved using this design methodology. A direct comparison between single-ended and differential designs of the RF filter has also been presented in order to verify the correctness of the design methodology. View full abstract»

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  • 24 GHz low phase noise HBT dielectric resonator oscillator

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (8512 KB) |  | HTML iconHTML  

    This paper describes the design and performance of a novel, planar 24 GHz low phase noise GaAs HBT dielectric resonator oscillator (DRO) for millimeter wave short range radar sensors for automotive and industrial applications. The detailed design, circuit development and experimental results for the DRO are presented and discussed. The measurement of the oscillator showed a center frequency of 23.82 GHz with a fundamental output power of 3.33 dBm and a phase noise performance of -125.67 dBc/Hz at 100 KHz offset, the lowest yet reported. View full abstract»

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  • An embedded uniform linear monopole antenna array in a wing structure of a UAV

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (7218 KB) |  | HTML iconHTML  

    In this work we present the design and fabrication of a linear array of printed monopole antennas embedded within the wing structure of a small Unmanned Aerial Vehicle (UAV) and operating in the 2.4 GHz ISM band. Integration of antenna elements within UAV structures will reduce the weight and cost. Also, the use of embedded antenna arrays will increase the communication range and data throughput. A 4-element array is considered. Simulation and measurement results are shown and compared. View full abstract»

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  • Ka-band quadrature Doppler radar system with sub-millimeter resolution and sensitivity in measuring periodic movement

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3717 KB) |  | HTML iconHTML  

    In this paper, a 27.6 GHz Ka-band quadrature Doppler radar system is developed to measure the movement amplitude of periodic movement. Experiments were conducted to verify that by increasing the carrier frequency from 5.8 GHz to 27.6 GHz, the resolution can be improved to be in the sub-millimeter range. The relation between the sensitivity-limited detection range and movement amplitude under certain output power was also explored. View full abstract»

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  • Thermal optimization of a flip-chip WiFi RF front-end IC

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (13843 KB) |  | HTML iconHTML  

    Flip-chip designs offer several advantages over traditional designs. However, thermal characteristics must be considered carefully, or the end result may have high junction temperatures and thus poor performance and poor reliability. This paper presents some guidelines for thermal optimization in flip-chip designs, and presents the results of a flip-chip single die WiFi FEM developed using Bi-FET (HBT+E/D-PHEMT) technology. In this design, both solder bumps and copper pillar bumps were developed for the flip chip process. View full abstract»

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  • Methodology of design of millimeter wave power amplifiers complying with 125°C electromigration design rules in advanced CMOS technology

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4552 KB) |  | HTML iconHTML  

    Two millimeter-wave (mmw) Power Amplifiers (PAs) designed in a 65 nm CMOS process with 8-metal layers and transistor ft/fmax of 160/200 GHz and complying with 125°C electromigration design rules are reported. The amplifiers are designed to first validate the passive and active millimeter-wave models and then study the MOS reliability at 60 GHz. In this way, the PAs design takes electromigration constraints at 125°C into account which implies limitations on MOS width and thus on the circuits performances. The PAs operate from a 1.2 V supply voltage. A power gain of 7.8 dB and 4.5 dB, an OCP1dB of 9 dBm and 6 dBm with 12.2% and 12.3% PAE and a saturated output power of 12 dBm and 9 dBm at 60 GHz are measured respectively for the 2 stages and the 1 stage amplifiers. Excellent agreement between measurement and simulation results at small and large signals is observed. View full abstract»

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  • A new Doherty amplifier design approach

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3039 KB) |  | HTML iconHTML  

    The conventional Doherty amplifier requires the auxiliary device current to increase faster than the main as the input power increases. This has been accomplished by additional control circuitry, or uneven power drive, or periphery scaling. This paper presents a new Doherty design approach that accepts the insufficient auxiliary device current. It is shown that with this approach, comparable power back-off efficiency is achieved while linearity is maintained. View full abstract»

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  • A wide-band differential and single-ended microwave amplitude detector

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (6387 KB) |  | HTML iconHTML  

    This paper presents a wide-band amplitude detector that can perform differential and single-ended signal detection on sinusoidal microwave/millimeter-wave signals. The detector contains only one active component, a diode-connected NPN bipolar transistor. The detector's two major advantages, simple circuit structure and variable measuring configurations, make it a good candidate for on-chip applications, and specifically convenient for Six-Port Reflectometer (SPR). To demonstrate its powerful functionality over a wide band, one of its several different measuring configurations is fabricated as a stand-alone circuit in the 0.13-¿m IBM BiCMOS-8HP technology. The simulation results show that the detector can work up to 80 GHz, and the measurement results verify its functionality up to 67 GHz due to test equipment limitations. The closed-form formulas of the developed detector are also given. View full abstract»

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  • Comparison of shunt-series shunt-shunt and shunt-series series-shunt dual feedback wideband amplifiers

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    The shunt-series shunt-shunt and shunt-series series-shunt dual feedback amplifiers are demonstrated in this paper using 2-¿m GaInP/GaAs HBT technology. The shunt-series shunt-shunt and shunt-series series-shunt wideband amplifiers achieve a small-signal gain of 31/33 dB with the same 3-dB bandwidth of 6 GHz. The noise figure of both amplifiers is below 3 dB from dc to 10 GHz. In addition, shunt-series shunt-shunt wideband amplifiers without and with a common-drain (CD) configuration are demonstrated using 0.35-¿m CMOS technology. As a result, the amplifier without/with a CD configuration achieves the power gain of 15/18 dB and noise figure of 9.5/10 dB, respectively, at a supply voltage of 3.3 V. View full abstract»

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  • 4 – 8 GHz LNA design for a highly adaptive small satellite transponder using InGaAs pHEMT technology

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3130 KB) |  | HTML iconHTML  

    The ever increasing global space activity is characterised by emerging space systems, operation and applications challenges. Hence, reliable RF and microwave receivers for in-orbit highly adaptive small satellites are needed to support reconfigurable multimedia/broadband applications in real-time with optimal performance. Though other parameters of the small satellite communication system may be critical, the noise level of the receiver determines the viability, reliability and deliverability of the project. Thus, a good design that delivers low noise performance, high gain and low power consumption for multipurpose space missions is inevitable. This paper describes a 0.15 ¿m InGaAs pseudomorphic high electron mobility transistor amplifier with low noise and high gain in the frequency band 4 - 8 GHz. The monolithic microwave integrated circuit LNA design presented here shows the best performance known using this technology; noise figure of 0.5 dB and gain of 37 ± 1 dB over the characterised bandwidth. View full abstract»

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  • An analytic technique for trade-off of noise measure and mismatch loss for low noise amplifier design

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5577 KB) |  | HTML iconHTML  

    An analytic technique and figure-of-merit (Fnm) for the trade-off of noise measure and mismatch loss in the design of a low noise amplifier is presented. The trade-off between various design parameters as a function of inductive source degeneration is evaluated from design curves developed and are shown to be unique to the selected device. Several devices demonstrated conditions whereby the use of source degeneration leads to instability and must be avoided. The technique is straightforward and permits pre-screening of potential devices being considered for low noise amplifier design. The resulting design curves permit accurate selection of the range of acceptable feedback values to achieve desired performance. The new figure-of-merit allows designers to choose the optimum value of source inductance either analytically or graphically. The new methodology is discussed and applied to a low noise amplifier design at 10.24 GHz. View full abstract»

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  • Multi-objective optimization algorithms for sensor network design

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1841 KB) |  | HTML iconHTML  

    Many sensor network design problems are characterized by the need to optimize multiple objectives. However, existing techniques in sensor network design generally optimize only one objective while treating the others as constraints or convert the multi-objective optimization problem into a single objective optimization problem using weights associated with different objectives. The weighted sum approach is subjective and is incapable of obtaining multiple tradeoff solutions for non-convex optimization problems. A multi-objective optimization approach optimizes all objectives simultaneously and obtains multiple tradeoff solutions for non-convex problems without the need for a weight vector. This paper illustrates this approach by formulating and solving the sensor placement problem for energy efficient target detection as a multi-objective optimization problem. View full abstract»

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  • 3.6-to-4.4 GHz UWB impulse transmitter and 402-to-405MHz super-regenerative receiver for medical implant devices

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3940 KB) |  | HTML iconHTML  

    This paper propose a multi-standard transceiver architecture, based on 3.6-to-4.4 GHz UWB impulse transmitter and 402-to-405 MHz super-regenerative receiver for medical implant devices. This architecture eliminates the requirement of frequency synthesizer and power amplifier at transmitter side and LNA, mixers, IF amplifiers and ADCs. at receiver side of implant transceiver. The multi-standard external PCB loop antenna is incorporated into the transceiver as inductive element to achieve high sensitivity and selectivity. The design concept is simulated in 0.24 um Ihp CMOS technology. The exchange rate up to 120 kbps is achieved for detecting -95 dBm signals with the power consumption of 500 uW. View full abstract»

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  • Low power super-regenerative Impulse-FM-UWB transceiver for WBAN

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2947 KB) |  | HTML iconHTML  

    This paper presents a low power super-regenerative Impulse-FM-UWB transceiver architecture for wireless body area networks. The design architecture consists of two different colpitts oscillators tuned at 3.5GHz and 4GHz. The external PCB loop antenna is incorporated into these oscillators as an inductive element to achieve high sensitivity and selectivity. These oscillators transmit impulses of FM-UWB signals in switched OOK mode and receive in super-regenerative mode. The design concept is simulated in 0.18¿m CMOS technology. The data exchange rate of 2Mbps is achieved for detecting -95dBm signals with the power consumption of 400¿W. View full abstract»

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