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Microwave and Wireless Components Letters, IEEE

Issue 3 • Date March 2013

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Displaying Results 1 - 22 of 22
  • Table of Contents

    Publication Year: 2013 , Page(s): C1 - C4
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  • IEEE Microwave and Wireless Components Letters publication information

    Publication Year: 2013 , Page(s): C2
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  • A Hybrid Electromagnetics-Circuit Simulation Method Exploiting Discontinuous Galerkin Finite Element Time Domain Method

    Publication Year: 2013 , Page(s): 113 - 115
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (690 KB) |  | HTML iconHTML  

    A hybrid electromagnetics (EM)-circuit simulation method employing the discontinuous Galerkin finite element time domain (DGFETD) method is developed to model single lumped port networks comprised of both linear and non-linear elements. The whole computational domain is split into two subsystems: one is the EM subsystem that is analyzed by DGFETD, while another is the circuit subsystem that is modeled by the Modified Nodal Analysis method to generate a circuit subsystem. The coupling between the EM and circuit subsystems is achieved through a lumped port. Due to the local properties of DGFETD operations, only small coupling matrix equation systems are involved. To handle non-linear devices, the standard Newton-Raphson method is applied to the established non-linear matrix equations. Numerical examples are presented to validate the proposed algorithm. View full abstract»

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  • Improved polynomial chaos discretization schemes to integrate interconnects into design environments

    Publication Year: 2013 , Page(s): 116 - 118
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (632 KB) |  | HTML iconHTML  

    Recently, an efficient stochastic modeling method for interconnects with inherent variability in their physical parameters was proposed, based on applying the so-called polynomial chaos (PC) approach in conjunction with a Stochastic Galerkin Method (SGM) onto telegrapher's equations. Although this approach was already very successful from a numerical point of view, the novel technique could not be conveniently integrated into SPICE-like solvers, limiting the applicability of the method. In this letter, the PC-SGM scheme for telegrapher's equations is revisited, pinpointing the origin of this inconvenience and immediately allowing to mitigate the issue. By adapting the traditional discretization of the stochastic telegrapher's equations approach, an augmented, yet deterministic, set of ordinary differential equations is obtained that turns out to be of the same type as the telegrapher's equations, and hence, the physical property of reciprocity is preserved. Consequently, it can be directly and more efficiently handled using SPICE-like solvers, which usually assume matrix symmetries. As an application example, the variability analysis of a state-of-the-art on-chip line for millimeter-wave applications is performed in a SPICE solver. View full abstract»

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  • A Novel Wideband Bandpass Power Divider With Harmonic-Suppressed Ring Resonator

    Publication Year: 2013 , Page(s): 119 - 121
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (648 KB) |  | HTML iconHTML  

    A simple stub-loaded ring resonator is presented as a novel wideband bandpass power divider with good in-band responses and out-of-band harmonic suppression. The first two resonances of the ring resonator are excited and employed to construct a wideband passband. By adjusting the length of loaded open stubs, four transmission zeros can be generated in the lower and upper stopbands. After installing three coupled-line sections at one input port and two output ports along the ring, additional two in-band poles and one upper-stopband transmission zero are further introduced. Subsequently, total five transmission zeros are utilized to improve the passband selectivity and suppress the high-order harmonic. In addition, a single resistor is properly placed between two output ports to ensure the isolation. Finally, a prototype power divider is fabricated and verified experimentally with attractive bandpass features. View full abstract»

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  • Design and Testing of a Single-Layer Microstrip Ultrawideband 90° Differential Phase Shifter

    Publication Year: 2013 , Page(s): 122 - 124
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (594 KB) |  | HTML iconHTML  

    This letter proposes a design of single-layer microstrip ultrawideband (UWB) 90° differential phase shifter. The operating bandwidth covers the UWB frequency range from 3.1-10.6 GHz. The design is optimized using a transmission line model and an electromagnetic model, and have been fabricated using a plotter dealing with generation of printed circuits. The measured S11 is better than -10 dB and S21 is better than -0.96 dB within the UWB frequency range. The simulated and measured phase deviation of the differential phase shift are 90°±5.23° and 90°±9.02°, respectively. The advantages of the proposed design are the simple fabrication, low insertion loss, and broad bandwidth. View full abstract»

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  • Design of a Wideband Balun Using Parallel Strips

    Publication Year: 2013 , Page(s): 125 - 127
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (551 KB) |  | HTML iconHTML  

    A wideband balun designed by exact synthesis is presented in this letter. The designed balun has a symmetrical four-port structure with one port open-ended. It consists of a wideband impedance transformer and a broadband phase inverter, which is realized by connecting bottom and top layer parallel strip through two via holes. To design the wideband impedance transformer, an S-plane highpass prototype has been exactly synthesized with third-order Chebyshev response. The proposed design procedure is very flexible, and it can be easily scaled for other frequency bands. A wideband parallel strip balun operating from 0.72 to 2.05 GHz is fabricated and tested to verify the design concepts. The measured results match well with the design theory. View full abstract»

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  • A Novel Ultra-Wideband Differential Filter Based on Microstrip Line Structures

    Publication Year: 2013 , Page(s): 128 - 130
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (565 KB) |  | HTML iconHTML  

    A novel differential filter with ultra-wideband (UWB) response is proposed in this letter based on microstrip line structures. 180° UWB phase shifters and 360° transmission lines are employed in the design to get the 180° phase shift over broad bandwidth. In this way, the broadband conversion between in- and out-of-phase signals can be realized. Utilizing this characteristic, the undesired common-mode noises will be cancelled out at the center of the filter, while the input differential-mode signals can still propagate well. The proposed new differential filter was calculated by transmission line model, simulated by full-wave electromagnetic simulator, and validated by the measurement. The simulation and measurement results verify its good performance. It is validated that, in the proposed filter, the differential-mode signals can propagate well with UWB frequency response, while the common-mode noises are well suppressed with more than 10 dB suppression in the concerned frequency band. View full abstract»

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  • A Tune-All Wideband Filter Based on Perturbed Ring-Resonators

    Publication Year: 2013 , Page(s): 131 - 133
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (836 KB) |  | HTML iconHTML  

    A dual-mode resonator is presented for tunable wideband filters, which allows tunability in both the centre frequency and bandwidth. It is based on a new perturbation arrangement in a ring-resonator that is electronically tuned with varactor diodes. A filter is designed for a radio astronomy receiver application. It consists of 6 cascaded dual-mode resonators with a 49% bandwidth in the L-band. High selectivity and low insertion losses are achieved. The centre frequency is tunable by 9% and the bandwidth by 25.3%. This design is unique in that it achieves wide bandwidth, is realisable in microstrip and tunable in both the centre frequency and bandwidth. View full abstract»

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  • A coplanar waveguide bandwidth-tunable lowpass filter with broadband rejection

    Publication Year: 2013 , Page(s): 134 - 136
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1116 KB) |  | HTML iconHTML  

    A coplanar waveguide lowpass filter (CPW-LPF) with high bandwidth tunability and broadband rejection is demonstrated. Compared to the reported design approaches, a relatively straightforward design with varactor-tuned microwave resonators is proposed for the realization of the tunable CPW-LPF. It is shown that the presented tunable CPW-LPF has a wide bandwidth tuning range via a small bias swing, low passband insertion loss, as well as wideband rejection. Also, the filter roll-off remains unchanged while the cut-off frequency is varied. The proposed tunable CPW-LPF is experimentally verified and expected to find applications in modern communication systems. View full abstract»

    Open Access
  • Analytical Coupled-Resonator Filter Synthesis Method by Extraction of Fully Canonical Second Order Blocks

    Publication Year: 2013 , Page(s): 137 - 139
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (630 KB) |  | HTML iconHTML  

    This work presents an analytical method for extraction of cascaded fully canonical second order blocks, formed by two resonators with a direct input-output coupling that generates two transmission zeros. Starting from the transfer matrix of the complete network and the specification of the transmission zeros, the method finds a decomposition of the transfer polynomials into two new sets corresponding to the second order subnetwork and the remaining one. To do so, the general solution of the extracted block transfer matrix is computed at each transmission zero. Then, both solutions are used to solve the complete polynomials. In order to illustrate the use of the algorithm, an analytical synthesis of a seventh order filter with four transmission zeros is included. The network topology corresponds to two cascaded quadruplets sharing one resonator. View full abstract»

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  • A Novel Transformer Based Current Reused VCO/ILFD With Variable Dividing Ratio

    Publication Year: 2013 , Page(s): 140 - 142
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (735 KB) |  | HTML iconHTML  

    A novel, current reused, voltage-controlled oscillator (VCO) and injection-locked frequency divider (ILFD) with variable dividing ratio is presented and implemented in UMC 0.18 triple-well CMOS process. The proposed architecture allows compact and low power solution to be attained by the stacking of a ring-type ILFD and a transformer based VCO. The LC VCO provides the wideband differential output and the two-stage ring oscillator generates the quadrature output with selectable division ratios. Experimental results show an output frequency range from 0.58 to 3.11 GHz and a phase noise level of -112.5 dBc/Hz at 1 MHz offset from carrier (5.72 GHz). This chip occupies a core area of 0.5 × 0.3 mm2 and consumes 4.7 mA from a 1.8 V power supply. View full abstract»

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  • A Current-Switching and g _{m} -Enhanced Colpitts Quadrature VCO

    Publication Year: 2013 , Page(s): 143 - 145
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (742 KB) |  | HTML iconHTML  

    This letter presents the design and analysis for a low-phase-noise and low-power Colpitts quadrature voltage-controlled oscillator (QVCO). The Colpitts QVCO employs current switching to lower the phase noise, gm enhancement to improve the startup condition in the oscillator core, and device reuse to realize anti-phase injection locking for QVCO operation. The proposed Colpitts QVCO has superior phase noise than cross-coupled LC tank VCO and outperforms conventional QVCO in phase noise, quadrature phase accuracy, and tuning range. The fabricated 0.18 μm CMOS Colpitts QVCO draws 500 μA from a 1.5 V power supply and exhibits a phase noise of -118 dBc/Hz at 1 MHz offset and a quadrature phase error of 0.3° at the center frequency of 488 MHz. View full abstract»

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  • A Back-Gate Coupling Quadrature Voltage-Control Oscillator Embedded With Self Body-Bias Schema

    Publication Year: 2013 , Page(s): 146 - 148
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (588 KB) |  | HTML iconHTML  

    A quadrature voltage-controlled oscillator was designed with back-gate coupling and embedded self body-biasing and implemented with the TSMC 0.18 μm 1P6M CMOS technology. Without using any extra negative bias-pin in the current-reuse structure, this embedded body-bias schema makes the switching transistors become forward body-biased in the duration of turn-on. It is not only beneficial for low-voltage operation, but also achieves a high oscillating output power (-2.5 dBm) with less supply power (2.5 mW). The percentage of frequency tuning range is 17.5% (from 4.60 to 5.48 GHz). The phase noise is -114 dBc/Hz at 1-MHz offset from the carrier frequency of 5.48 GHz. View full abstract»

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  • A 15–40 GHz CMOS True-Time Delay Circuit for UWB Multi-Antenna Systems

    Publication Year: 2013 , Page(s): 149 - 151
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (445 KB) |  | HTML iconHTML  

    A CMOS true-time delay (TTD) circuit operating from 15 to 40 GHz is presented for integrated UWB multi-antenna systems. The TTD circuit employs a distributed active switching structure in which eight cascode switches are distributed along transmission lines, leading to 3-bit variations of the group delay. The size of the switches and the characteristic impedance of the transmission lines are carefully scaled so as to minimize loss variation among the different delay states, while maintaining flat delay performance over a wide bandwidth. The circuit is implemented in a bulk 0.13-μm CMOS technology and exhibits a total variable group delay of 40 ps with an average resolution of 5 ps from 15 to 40 GHz. The insertion loss was 14 dB with a maximum RMS variation of 1.6 dB, while the input and output return loss was better than 10 dB over the operating bandwidth. View full abstract»

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  • A 2.24 mW 74 dBΩ-Gain, dc to 600 MHz-BW differential baseband amplifier for 60 GHz wireless applications

    Publication Year: 2013 , Page(s): 152 - 154
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (503 KB) |  | HTML iconHTML  

    A low power, wideband and high linearity current-mode based differential baseband amplifier with a bandwidth from dc to 600 MHz applied for 60 GHz zero-IF RF receiver is presented. The wideband differential baseband amplifier is realized in a 90 nm CMOS process. A series-series feedback technique and a Q-enhanced active inductor are adopted in the current-mode baseband amplifier for achieving wideband and high linearity under a small current consumption. The measured maximum BW of 600 MHz, gain of 74 dBΩ and OIP3 of +12.5 dBV are realized with power consumption of only 2.24 mW under a supply voltage of 1.4 V. The measured performance shows the baseband amplifier fulfills the requirements for 60 GHz zero-IF RF transceivers. View full abstract»

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  • A Reconfigurable Differential CMOS RF Energy Scavenger With 60% Peak Efficiency and -21 dBm Sensitivity

    Publication Year: 2013 , Page(s): 155 - 157
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (577 KB) |  | HTML iconHTML  

    A differential RF-DC CMOS converter for RF energy scavenging based on a reconfigurable voltage rectifier topology is presented. The converter efficiency and sensitivity are optimized thanks to the proposed reconfigurable architecture. Prototypes, realized in 130 nm, provide a regulated output voltage of ~2 V when working at 868 MHz, with a -21 dBm sensitivity. The circuit efficiency peaks at 60%, remaining above the 40% for a 18 dB input power range. View full abstract»

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  • 20-pJ/Pulse 250 Mbps Low-Complexity CMOS UWB Transmitter for 3–5 GHz Applications

    Publication Year: 2013 , Page(s): 158 - 160
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (723 KB) |  | HTML iconHTML  

    This letter presents a CMOS on-off keying 3-5 GHz ultra-wideband (UWB) transmitter with low complexity, low power and high speed. In the transmitter, a new differential narrow triangular pulse generator using push and pull integrating technique was designed for reducing quiescent current and common-mode interference, and a new complementary switch mode on-off voltage controlled ring oscillator (VCRO) was proposed by breaking the oscillation loop instead of breaking the power to avoid base-band energy without extra shaping filter. Without using delay resistor and capacitor in the VCRO, the transient response speed of the transmitter can be increased by only utilizing the parasitic resistances and capacitances. The design was successfully implemented with a 0.18 μm CMOS technology. The test results show that the new UWB transmitter can obtain a sidelobe rejection of more than 20 dB, a low energy consumption of 20 pJ/pulse at 250 Mbps, and a small core chip size of 0.08 mm2. View full abstract»

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  • 32 dBm Power Amplifier on 45 nm SOI CMOS

    Publication Year: 2013 , Page(s): 161 - 163
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (569 KB) |  | HTML iconHTML  

    A silicon metal-semiconductor-field-effect-transistor (MESFET) power amplifier operating at 900 MHz fabricated on a 45 nm silicon-on-insulator CMOS process with no changes to the process flow is presented. The soft breakdown of the MESFET is 20 times that of the MOSFET and allowed a single transistor amplifier based on Class A bias conditions to operate at up to 32 dBm output power with an 8 V drain bias. The amplifier had a peak power added efficiency of 37.6%, gain of 11.1 dB, OIP3 of 39.3 dBm and 1 dB compression point at an output power of 31.6 dBm. The device required only 0.125 mm 2 of active area. Additionally, the depletion mode operation of the MESFET enables a simple input bias approach using an inductor to ground at the gate of the device. View full abstract»

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  • Energy Harvesting Circuit on a One-Sided Directional Flexible Antenna

    Publication Year: 2013 , Page(s): 164 - 166
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (615 KB) |  | HTML iconHTML  

    The present letter describes the design of an energy harvesting circuit on a one-sided directional flexible planar antenna. The circuit is composed of a flexible antenna with an impedance matching circuit, a resonant circuit, and a booster circuit for converting and boosting radio frequency power into a dc voltage. The proposed one-sided directional flexible antenna has a bottom floating metal layer that enables one-sided radiation and easy connection of the booster circuit to the metal layer. The simulated output dc voltage is 2.89 V for an input of 100 mV and a 50 Ω power source at 900 MHz, and power efficiency is 58.7% for 1.0 × 107 Ω load resistance. View full abstract»

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  • 2013 IEEE membership form

    Publication Year: 2013 , Page(s): 167 - 168
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    Freely Available from IEEE
  • IEEE Microwave and Wireless Components Letters Reviewers List

    Publication Year: 2013 , Page(s): C3
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    Freely Available from IEEE

Aims & Scope

The IEEE Microwave and Wireless Components Letters (MWCL) publishes three page papers that focus on microwave theory, techniques and applications as they relate to components, devices, circuits, biological effects, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals.

Full Aims & Scope