Electronics Letters

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Displaying Results 1 - 25 of 37
• In brief

Publication Year: 2012, Page(s): 134
| |PDF (298 KB)
• Interview

Publication Year: 2012, Page(s): 134
| |PDF (130 KB)

Publication Year: 2012, Page(s):135 - 136
| |PDF (1936 KB)
• Powering down

Publication Year: 2012, Page(s): 136
| |PDF (282 KB)
• Acoustic targets feature extraction method based on manifold learning

Publication Year: 2012, Page(s):139 - 140
Cited by:  Papers (1)
| |PDF (168 KB)

A new method for feature extraction of acoustic targets based on manifold learning is proposed. The new method overcomes the shortcomings of the original manifold learning algorithm by minimising the impact of noise on the manifold and makes full use of the classification information to extract the intrinsic features of acoustic targets, thus improving the accuracy of acoustic targets recognition.... View full abstract»

• Compact planar microstrip-fed quasi-Yagi antenna

Publication Year: 2012, Page(s):140 - 141
Cited by:  Papers (11)
| |PDF (398 KB)

A novel compact planar microstrip-fed quaisi-Yagi antenna is investigated. The feeding structure is directly realised by a microstrip line and has the advantage of avoiding the introduction of a balun, transition, tapered or truncated structures, thereby decreasing design complexity. The proposed antenna shows measured impedance bandwidth from 2.74 to 4.25 GHz for a return loss less than 10 dB, an... View full abstract»

• Continuously polarisation reconfigurable antenna element by using liquid crystal based tunable coupled line

Publication Year: 2012, Page(s):141 - 143
Cited by:  Papers (3)
| |PDF (355 KB)

A polarisation reconfigurable microstrip patch antenna element is presented. The antenna includes a liquid crystal based tunable coupled line by which the antenna polarisation can be controlled. The prototype is fabricated in a similar fashion to LC displays resulting in a low-cost and simple fabrication compared to other tunable device fabrication technologies. The antenna operates at 13.75 GHz w... View full abstract»

• 68.4 μW 400 MHz intrabody communication receiver front-end for biomedical applications

Publication Year: 2012, Page(s):143 - 144
Cited by:  Papers (3)
| |PDF (264 KB)

A 400 MHz sub-hundred microwatt intrabody communication receiver front-end suitable for OOK, ASK and FSK modulation schemes and applied to personal health wearable/implantable devices is presented. 68.4 μW of static power, 24.1 dB of gain, at least 18 dB fundamental above distortions and 167×118 μm2 of core size are achieved in 0.18 m CMOS technology. View full abstract»

• ISFET sensor system for real-time detection of extracellular pH oscillations in slime mould

Publication Year: 2012, Page(s):144 - 146
Cited by:  Papers (1)
| |PDF (541 KB)

An ion sensitive field effect transistor (ISFET) array for the direct observation of physiochemical activity in a living biological specimen of a slime mould is demonstrated. The chip comprises a 64 × 64 pixel array of 10.2 × 10.2 μm sensors. The device was fabricated in a standard 0.35 μm foundry CMOS process. Using this device it was possible to observe periodic varia... View full abstract»

• Area-efficient programmable switched-capacitor-based peak detector

Publication Year: 2012, Page(s):146 - 148
| |PDF (173 KB)

An area-efficient programmable switched-capacitor-based peak detector (PD) is presented. A programmable switched-capacitor resistor (SCR) is used to replace the small discharging current source in the conventional PD. The SCR can be programmable from megohms to gigaohms to ensure that the proposed PD works properly and achieves small detection errors over a wide input frequency range. The proposed... View full abstract»

• FPGA implementation of biologically-inspired auto-associative memory

Publication Year: 2012, Page(s):148 - 149
Cited by:  Papers (2)
| |PDF (413 KB)

The design of an auto-associative memory based on a spiking neural network is described. Delays rather than binary values are used to represent signals and coincidence is used to perform pattern matching. A complete implementation of the memory on a single FPGA is presented. View full abstract»

• Matched dual-channel front-end preamplifier for differential time delay measurements

Publication Year: 2012, Page(s):149 - 150
| |PDF (345 KB)

Presented is an integrated circuit dual-channel front-end preamplifier that minimises the differential time delay (DTD) between two channels. The circuit, which is based on a chopper architecture, works in the audio range and is intended for applications in sound localisation based on bearing estimation. The circuit was fabricated in a 1.5 × 1.5 mm die, in a 0.5 μm technology. Experi... View full abstract»

• Wideband measurement system for on-chip ESD waveform characterisation

Publication Year: 2012, Page(s):150 - 152
Cited by:  Papers (1)
| |PDF (152 KB)

In this age where new electronic designs are constantly pushing the limits of technology, there is a persistent need for better electrostatic discharge (ESD) protection. Proposed is a measurement probe architecture that can be used for on-chip ESD waveform characterisation. The probe circuit design is presented and test results show the feasibility of the proposed system. Such a measurement system... View full abstract»

• Fast online identification of low-order time-delayed industrial processes

Publication Year: 2012, Page(s):152 - 153
Cited by:  Papers (1)
| |PDF (243 KB)

Although online identification of low-order industrial processes is straightforward when the time delay is known and fixed, the problem becomes significantly more challenging when the delay is unknown and/or varying. Presented is a fast, exact recursive identification algorithm for this situation with a memory and time complexity that is linearly bound in the unknown delay. Experiments indicate th... View full abstract»

• Alpha matting using compressive sensing

Publication Year: 2012, Page(s):153 - 155
Cited by:  Papers (2)
| |PDF (470 KB)

Image matting may be defined as the extraction and composition of foreground pixels from a given image using colour or opacity estimation. A novel alpha matting methodology is proposed using compressive sensing. The experimental results show that the proposed matting method can provide good mattes from either scribbles or large parts of unknown regions in a trimap. View full abstract»

• Image enhancement using background brightness preserving histogram equalisation

Publication Year: 2012, Page(s):155 - 157
Cited by:  Papers (5)
| |PDF (312 KB)

Histogram equalisation (HE) is widely used to enhance the image contrast but it tends to over-enhance the image background brightness. Improvement schemes have been introduced to reduce this defect of the conventional HE, but the over-enhancement of the background brightness is still obvious. A novel approach of nonlinear HE is presented, which is able to enhance the image contrast while preservin... View full abstract»

• Subspace estimates for real-time hyperspectral video systems

Publication Year: 2012, Page(s):157 - 159
| |PDF (128 KB)

A method is presented for rapidly estimating the principal components used in dimension reduction for high frame rate hyperspectral video systems. Pixels entering and leaving a video frame are used to rapidly update the covariance matrix (Σ) and estimate the perturbed eigenpairs. Measuring the angle between the estimated dominant eigenspace and the exact eigenspace shows the method to be a ... View full abstract»

• Simple implementation of vectorial modulo operation based on fundamental parallelepiped

Publication Year: 2012, Page(s):159 - 160
Cited by:  Papers (2)  |  Patents (2)
| |PDF (204 KB)

Multidimensional lattices constitute a unifying framework for several signal processing applications. Described is a simple and elegant algorithmic implementation of the vectorial modulo operation based on the lattice fundamental parallelepiped which permits automatising the lattice elements' indexing. View full abstract»

• Efficient multivariate feature filter using conditional mutual information

Publication Year: 2012, Page(s):161 - 162
| |PDF (207 KB)

This reported work focuses on designing an efficient feature filter from a computational point of view. The proposed multivariate filter method using conditional mutual information selects a feature subset that maximises relevance to target class while minimising redundancy between features in O(N) time. View full abstract»

• Fast sparse representation model for I1-norm minimisation problem

Publication Year: 2012, Page(s):162 - 164
| |PDF (193 KB)

To solve the l1-norm minimisation problem, many algorithms, such as the l1-Magic solver, utilise the conjugate gradient (CG) method to speed up implementation. Since the dictionary employed by CG is often dense in large-scale mode, the time complexities of these algorithms remain significantly high. As signals can be modelled by a small set of atoms in a dicti... View full abstract»

• Inductor structure with improved space utilisation

Publication Year: 2012, Page(s):164 - 165
Cited by:  Papers (6)
| |PDF (246 KB)

The core and winding of an inductor are designed to distribute flux for distributing energy uniformly in the core to utilise magnetic material throughout the core volume. The structure is designed to avoid crowding of flux for low core loss. The winding is patterned for shorter length and larger area of the cross-section for low winding loss. The footprint area of a three-cell inductor is 1.48 tim... View full abstract»

• 1.4 MHz radio frequency metal-base transistor using single emitter layer

Publication Year: 2012, Page(s):165 - 166
| |PDF (249 KB)

A report is presented on a study of single emitter layer metal base transistors with a base terminal made of aluminium grids. The latter exhibits low operating voltage associated to the high resistivity of the collector terminal and also shows very low leakage current. With such a single emitter layer, common-emitter current gain, on/off current ratio, and cutoff frequency of, respectively, 239.62... View full abstract»

• Design of compact inphase power divider with one narrow notch band for UWB application

Publication Year: 2012, Page(s):166 - 168
Cited by:  Papers (6)
| |PDF (374 KB)

A novel multilayer inphase power divider with ultra-wideband behaviour and a sharply rejected notch band is presented. The proposed power divider employed a broadside coupling structure via a multilayer slot configuration and a single isolation resistor. One notch band is obtained by introducing one coupled folded stepped impedance resonator with metalised via hole to ground. Simulated and measure... View full abstract»

• Using body biasing to control phase-noise of CMOS LC oscillators

Publication Year: 2012, Page(s):168 - 169
Cited by:  Papers (2)
| |PDF (235 KB)

An approach to adjusting and optimising the phase-noise performance of CMOS LC oscillators is presented. The technique is based on controlling the bulk-source voltage of the cross-coupled transistors in the oscillator core. It is shown that the impedance in the path of the current through the oscillator core to ground at the second harmonic of oscillation can be maximised through changing t... View full abstract»

• 1 x 8 self-routing of 40 Gbit/s phase-modulated packets

Publication Year: 2012, Page(s):169 - 171
| |PDF (347 KB)

A self-routing all-optical circuit for 40 Gbit/s DPSK optical packets is presented. The header information is self-processed to eventually drive an all-optical flip-flop, which serves as the optical pump in a coherent wavelength converter. Operation of the circuit is shown and switched optical packets with an overall limited penalty ( 1 dB) are reported. View full abstract»

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