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Electronics Letters

Issue 10 • Date May 10 2012

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Displaying Results 1 - 25 of 44
  • In brief

    Publication Year: 2012, Page(s): 534
    IEEE is not the copyright holder of this material | PDF file iconPDF (86 KB)
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  • Interview

    Publication Year: 2012, Page(s): 534
    IEEE is not the copyright holder of this material | PDF file iconPDF (86 KB)
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  • close to tiers

    Publication Year: 2012, Page(s): 535
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (179 KB)

    A new class of RF switches have been developed by MIT Lincoln Laboratory in the US. The single chip high-performance vertically stacked switches are based on a wafer-scale 3D integration technology, and have a footprint that is much smaller than in conventional 2D switches. The approach, which is fully compatible with the standard Si CMOS process, could also be used for other types of circuit such... View full abstract»

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  • intense resonance

    Publication Year: 2012, Page(s): 536
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (178 KB)

    Researchers from the Tokyo Institute of Technology have demonstrated a direct modulation of the output power of a resonant tunnelling diode (RTD) oscillator and measured its frequency response in the THz frequency range. They have also achieved wireless data transmission at 542 GHz, the first report of wireless communication in this range. View full abstract»

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  • Design of narrow bandwidth elliptic-type SAW/BAW filters

    Publication Year: 2012, Page(s):539 - 540
    Cited by:  Papers (2)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    The passband width obtained in the SAW/BAW filter is inherently limited by the electromechanical coupling factor K2 of piezoelectric substrate. Proposed is a new design technology to flexibly control the passband width without sacrificing insertion loss, out-of-band rejection and steepness of the transition bands. A bandpass LC filter has been designed based on the traditional el... View full abstract»

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  • Bandwidth limits for lossless planar arrays over ground plane

    Publication Year: 2012, Page(s):540 - 542
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (205 KB)

    Maximum bandwidth limits are developed for lossless planar arrays over a ground plane through use of Fano's broadband impedance matching method and Richards' transformation. It is demonstrated that such an array cannot exceed 8.3:1 bandwidth without material loading (for VSWR'2). It is also demonstrated that an additional dielectric superstrate layer can provide up to 12.1:1 bandwidth, without mag... View full abstract»

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  • Broadband circularly polarised slot antenna array for L- and S-band applications

    Publication Year: 2012, Page(s):542 - 543
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (185 KB)

    A new design of a broadband circularly polarised square slot antenna array (CPSSAA) fed by a symmetric coplanar waveguide (CPW) for L- and S-band applications is presented. The proposed antenna is composed of 2×2 CPSS antennas and a sequentially rotated feed network. In this model, compared with the previous CPSSAA with an asymmetric fed structure, the impedance bandwidth of the antenna is ... View full abstract»

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  • Design of multi-band CPW-fed antenna for triple-frequency operation

    Publication Year: 2012, Page(s):543 - 545
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (467 KB)

    Presented is a coplanar waveguide fed antenna for multi-band operation covering the digital video broadcasting signal reception in the UHF band, mobile communications in the GSM band, and the 2.4 GHz 802.11g/n band. The size of the designed antenna is 114×60 mm and it is printed on an FR4 substrate of thickness 0.8 mm with dielectric constant 4.4. It has an inner U-shaped strip enclosed by ... View full abstract»

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  • Measurements and prediction of outage intensity owing to rain attenuation

    Publication Year: 2012, Page(s):545 - 546
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    Measured data of rain attenuation from 19 terrestrial line-of-sight links, operating in frequencies from 14.5 to 83.5 GHz, were analysed to provide statistics of fade durations as a function of the attenuation threshold. From these results, an empirical method for predicting outage intensity owing to rain attenuation was derived, that shows good agreement with the measurements and allows the calcu... View full abstract»

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  • Yagi antenna with improved out-of-band gain suppression

    Publication Year: 2012, Page(s):546 - 548
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    Presented is a Yagi antenna with improved out-of-band gain suppression to reduced the demands on the front end band filter. Two parasitics close to the fed element are used to increase the Q-factor of that element, and the length and position of the other directors and reflectors are optimised to suppress the out-of-band gain. Simulated and measured results show that the proposed antenna ha... View full abstract»

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  • Minimal readout scheme for ISFET sensing arrays based on pulse width modulation

    Publication Year: 2012, Page(s):548 - 549
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (281 KB)

    Proposed is an ISFET readout scheme with minimum analogue components to minimise parasitic and noise effects in large-scale chemical sensing arrays. For each array pixel, a pair of complementary ISFETs shares the same floating gate in an inverter configuration. An additional electrical input is capacitively coupled to the same floating gate with a periodic reference signal input. In this way, the ... View full abstract»

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  • ISFET-based chemical Schmitt trigger

    Publication Year: 2012, Page(s):549 - 551
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (267 KB)

    Ion sensitive field effect transistors (ISFETs) are pH sensors that have generally been used in the analogue domain. It is possible to use them in the digital domain for chemical thresholding applications. To facilitate small pH change detection where a simple switch suffers from ripple and distorted output, a chemical switch with input noise immunity is needed. Reported are first measurements of ... View full abstract»

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  • Power efficient output stage for high density implantable stimulators

    Publication Year: 2012, Page(s):551 - 552
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (152 KB)

    In implantable stimulators, a current-controlled stimulation is preferred over a voltage-controlled one due to its safety. However, the power efficiency is a major disadvantage. By reducing the headroom voltage needed in the current driver, power efficiency of a constant current stimulation is improved. A promising technique is to bias the transistor in the triode region whereby improving output i... View full abstract»

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  • 0.07 mm2, 2 mW, 75 MHz-IF, fourth-order BPF using source-follower-based resonator in 90 nm CMOS

    Publication Year: 2012, Page(s):552 - 554
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    A highly-transistorised bandpass filter (BPF) using a source-follower-based (SFB) resonator is proposed. It benefits from the advantageous properties of the source follower (e.g. no parasitic pole, linear VGS I/O relationship, high-input and low-output impedances), while combining it with a compact and low-power grounded differential active inductor to synthesise the complex pole... View full abstract»

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  • CMOS 138 GHz low-power active mixer with branch-line coupler

    Publication Year: 2012, Page(s):554 - 555
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (341 KB)

    A 138 GHz down-conversion mixer with a branch-line coupler has been developed based on a 90 nm CMOS technology. The fabricated mixer shows a differential conversion gain of 3.7 dB with the mixer core drawing a current 0.66 mA from a 1.2 V supply. The 1 dB gain compression point is estimated to be larger than 6 dBm. The mixer occupies 0.61 0.62 mm2 of chip area excluding pads. View full abstract»

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  • Cellular nonlinear network controller for dynamic thermal management

    Publication Year: 2012, Page(s):555 - 557
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The dynamic thermal management problem is posed for multi-processing element (multi-PE) computing systems (which can support both dynamic re-parallelisation of tasks across PEs and their operating frequencies) as a multi-constraint optimisation problem. Proposed is a cellular nonlinear network controller as an online solver of this problem. Results obtained through a simulation model are presented... View full abstract»

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  • Double noise coupling ΔΣ analogue-to-digital converter

    Publication Year: 2012, Page(s):557 - 558
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (301 KB)

    A novel ΔΣ analogue-to-digital (ADC) architecture is proposed for second-order noise shaping enhancement. The new architecture is less dependent on the opamp DC gain than the earlier ΔΣ ADC with second-order noise shaping enhancement. Also, the proposed architecture reduces the complexity of the clock generator and zero optimisation compared to the earlier one. A 9... View full abstract»

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  • Fast median calculation method

    Publication Year: 2012, Page(s):558 - 560
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (182 KB)

    The ever increasing demand for high image quality requires fast and efficient methods for noise reduction. The best-known order-statistics filter is the median filter. A method is presented to calculate the median on a set of N W-bit integers in W/B time steps. Blocks containing B-bit slices are used to find B-bits of the median; using a novel quantum-like representation allowing the median to be ... View full abstract»

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  • Multi-stage noise band cancellation ΣΔ modulator for digitisation of distorted signals

    Publication Year: 2012, Page(s):560 - 562
    Cited by:  Papers (2)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (319 KB)

    A new sigma-delta modulator (ΣΔM) architecture is proposed to digitise wideband distorted signals. It combines frequency band decomposition with bandpass (BP) ΣΔ converters and cascaded architectures. The novelties are the use of the residual signal transfer function at the output of the first summing node in a classical BP ΣΔ that is an almost free signal... View full abstract»

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  • Time difference amplifier design with improved performance parameters

    Publication Year: 2012, Page(s):562 - 563
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (204 KB)

    Time difference amplification is a technique which has been developed previously to facilitate the measurement of temporal events in circuits whose magnitudes are decreasing with the advances in technology. A technique is proposed which extends the time input difference (ΔTinput) range achieved by current methods from 40 to 70 ps. View full abstract»

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  • Modified angular radial partitioning for edge image description in image retrieval

    Publication Year: 2012, Page(s):563 - 565
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (322 KB)

    An angular radial partitioning (ARP) method divides an edge image into M×N partitions in order to make its compact image descriptor. However, it inherently suffers from a boundary problem that arises when edge pixels exist near the partition boundaries. Proposed is a modified ARP (mARP) to reduce degradation of retrieval performance caused by the boundary problem. For comparis... View full abstract»

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  • Field-programmable true random number generator

    Publication Year: 2012, Page(s):565 - 566
    Cited by:  Papers (3)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (333 KB)

    True random number generation is crucial in cyber-security applications. Proposed is a voltage-controlled true random number generator that is inherently field-programmable. This facilitates increased entropy as a randomness source because there is more than one configuration state which lends itself to more compact and low-power architectures. It is evaluated through electrical characterisation a... View full abstract»

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  • Digital predistortion technique with in-band interference optimisation applied to DVB-T2

    Publication Year: 2012, Page(s):566 - 568
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (211 KB)

    The efficient transmission and nonlinear modelling of orthogonal frequency division multiplexing (OFDM) signals are difficult to address owing to the special characteristics of this modulation scheme. Proposed is a digital predistortion technique suitable for the implementation in an OFDM transmitter to optimise the in-band interference caused by the nonlinear distortion generated in the amplifica... View full abstract»

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  • Effect of class clustering on delay differentiation in priority scheduling

    Publication Year: 2012, Page(s):568 - 570
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (101 KB)

    Priority scheduling is the most viable way to implement QoS differentiation in telecommunication networks. Most studies on priority scheduling do not take into account possible class clustering. In particular, they assume that different classes occur randomly and independently in the arrival stream of packets. In reality, however, packets of the same class may have the tendency to arrive in cluste... View full abstract»

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  • Ultra-compacted sub-terahertz bandpass filter in 0.13 mm SiGe

    Publication Year: 2012, Page(s):570 - 571
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (404 KB)

    The design of an ultra-compacted silicon-based bandpass filter in the sub-terahertz frequency range is explored. A filter with combline topology consisting of multilayered resonators and a cross-coupling capacitor has been designed in 0.13 μm SiGe. The dimensions of the implemented filter are 40 × 130 μm2, which are even smaller than a ground-signal-ground probing p... View full abstract»

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Aims & Scope

Electronics Letters is internationally renowned for its rapid communication of new developments and emerging topics across the broad and interdisciplinary field of modern electronics and electrical engineering.

Full Aims & Scope

Meet Our Editors

Editors-in-Chief

Professor Chris Toumazou
Director of the Biomedical Institute
Imperial College, London, UK

Professor Ian White
Head of Photonics Research
University of Cambridge, UK