By Topic

# Electronics Letters

## Filter Results

Displaying Results 1 - 25 of 27
• ### Optically frequency modulated GaAs MESFET oscillator

Publication Year: 1981, Page(s):901 - 902
Cited by:  Papers (4)
| | PDF (295 KB)

A GaAs MESFET X-band oscillator has been frequency modulated by an amplitude modulated optical signal injected on the active device. A modulation index of 0.5 corresponding to MSK modulation has been achieved at 2 Mbit/s without parasitic amplitude modulation. It is shown that the FM modulation index variation against frequency is directly related to the drain current response of the FET considere... View full abstract»

• ### Waveguide cavity FET oscillator

Publication Year: 1981, Page(s):902 - 904
| | PDF (462 KB)

A new single-tuned oscillator, applicable to power combining circuits, is described in which a probe antenna is used to provide coupling between an active device and the cavity. It is shown that output power, oscillation frequency and injection locking range of the oscillator can be controlled independently in the circuit design. The experiments with low-power FET oscillators demonstrate output po... View full abstract»

• ### CCD linear image sensor with buried overflow drain structure

Publication Year: 1981, Page(s):904 - 905
Cited by:  Papers (1)
| | PDF (427 KB)

A CCD linear image sensor with buried overflow drain structure has been developed. Since the overflow drain, i.e. a reverse biased n-region buried under photosites arrayed in p-layer, makes an effective sink of excess electrons, imaging characteristics such as uniformity of photosensitivity, spectral response, resolution, and antiblooming, are highly improved. View full abstract»

• ### Mutual influence among imperfect joints in multimode-fibre link

Publication Year: 1981, Page(s):906 - 907
| | PDF (597 KB)

Power loss against offsets in multimode fibres with several joints is analysed via a modal (Hermite-Gauss) approach. A Monte Carlo analysis of a long link with mode differential attenuation shows that the average loss per joint is significantly larger than that measured at a single joint with steady-state input distribution. View full abstract»

• ### New reinforcement for arc-fusion spliced fibre

Publication Year: 1981, Page(s):907 - 908
Cited by:  Papers (3)
| | PDF (302 KB)

A new type of reinforcement using thermoplastic adhesives has been developed. The reinforcement consists of an EVA tube, a steel rod, and a PE shrinkable tube. A loss increase less than 0.1 dB at Â¿60Â°C and an average tensile strength of 2.3 kg have been achieved. Stable and reliable performance of the reinforcement has been confirmed by reliability tests. View full abstract»

• ### Simple derivation of discrete minimal-order optimal estimator

Publication Year: 1981, Page(s):908 - 910
Cited by:  Papers (1)
| | PDF (400 KB)

A simple new derivation of the minimal-order discrete-time optimal estimator is presented. The method exploits the fact that the Kalman filter algorithm can be directly reduced in order by the number of noise-free system measurements. View full abstract»

• ### Phase constraints on FIR digital filters

Publication Year: 1981, Page(s):910 - 911
Cited by:  Papers (1)
| | PDF (266 KB)

The letter shows how FIR digital filters can be designed to meet a specific nonlinear phase response in the transition region, although the gain of the filter is not specified in this region. View full abstract»

• ### Equivalent-time signal acquisition and processing

Publication Year: 1981, Page(s):911 - 912
| | PDF (256 KB)

Equivalent-time signal acquisition in the presence of stationary additive noise is considered and contrasted with realtimeÂ¿ transient recording. It is shown how the substantial noise decorrelation encountered with equivalent-time methods can markedly influence the form of an optimum post-processor and the signal/noise ratio attainable. View full abstract»

• ### Performance of ruthroff transformer with reactive loads

Publication Year: 1981, Page(s):913 - 914
| | PDF (213 KB)

The Ruthroff transformer, feeding a complex load impedance, is analysed and the results indicate it to be capable of matching a resistive source. Consideration of the equations obtained show that this may only be achieved when the ratio of load resistance to source resistance is greater than 4:1. View full abstract»

• ### Short- or open-circuited dipole parallel to perfect reflector plane and embedded in substrate and acting at resonance

Publication Year: 1981, Page(s):914 - 916
Cited by:  Papers (7)
| | PDF (342 KB)

The properties of an open or short-circuited flat resonant dipole parallel to a reflector plane and embedded in a substrate are given. Simple transmission-line model analysis is used. Correct agreement is obtained between theoretical and experimental results, and literal formulas for radiation resistance and bandwidth are thus justified. To a first approximation, the radiation resistance is indepe... View full abstract»

• ### Slot ring resonator and dispersion measurement on slot lines

Publication Year: 1981, Page(s):916 - 917
Cited by:  Papers (2)
| | PDF (281 KB)

Slot ring resonators are used for measuring slot line wavelength. The advantage is that no end effects need be considered. The experimental results agree well with the theoretical results in the 26Â¿33 GHz region. View full abstract»

• ### Excess-noise and receiver sensitivity measurements of In0.53Ga0.47As/InP avalanche photodiodes

Publication Year: 1981, Page(s):917 - 919
Cited by:  Papers (19)
| | PDF (466 KB)

We report the results of excess-noise and normalised receiver sensitivity measurements for In0.53Ga0.47As/InP avalanche photodiodes for use in the Â¿=0.95 Â¿m to 1.65 Â¿m spectral region. The excess-noise measurements are consistent with a hole-to-electron ionisation rate ratio in InP of ~ 0.4. The receiver sensitivity, measured at 45 Mbit/s and 10Â¿9 bit-error-rate, was Â¿53.2 dBm at a gain of 20... View full abstract»

• ### Two-stage stability test for two-dimensional recursive digital filters

Publication Year: 1981, Page(s):919 - 920
| | PDF (272 KB)

This letter presents a two-stage stability test for two-dimensional recursive digital filters and gives details for 1st- and 2nd-order two-dimensional sections. The method is based on the properties of two-variable strictly Hurwitz polynomials. View full abstract»

• ### Active RC single-resistance-controlled lossless floating inductance simulation using single grounded capacitor

Publication Year: 1981, Page(s):920 - 921
Cited by:  Papers (14)
| | PDF (283 KB)

A novel CCII-based circuit using a single grounded capacitor for single-resistance-controlled lossless floating inductance simulation is presented. View full abstract»

• ### Effect of substrate orientation on electrical properties of LPE-grown InP

Publication Year: 1981, Page(s):921 - 922
| | PDF (280 KB)

The carrier concentrations of LPE-grown layers on (111)B substrates are about twice that of layers grown simultaneously on (100) substrates from the same solution. The analysis shows that the distribution coefficient for donor impurity is about 2.5 times larger in the case of (111)B face than that of (100) face. View full abstract»

• ### Nonperiodic sampling and identifiability

Publication Year: 1981, Page(s):922 - 924
Cited by:  Papers (3)
| | PDF (352 KB)

It is shown that the state transition matrix may be identified using arbitrary sampling under not very restrictive conditions. A good transmission of the relative measuring errors towards the identification results may be achieved by an adequate choice of the sampling instants using very well known numerical analysis concepts. View full abstract»

• ### Low-cost multiprocessor system

Publication Year: 1981, Page(s):924 - 925
| | PDF (221 KB)

The letter presents a multiprocessor system particularly advantageous in tightly coupled structures. The procedure is based on the fact that the microprocessor CPUs actually interact with the memory and I/O devices during a small fraction of the clock cycle. Conflicts in the memory bus access are avoided by a simple clocking and enabling method. View full abstract»

• ### MOS switched capacitor integrator eliminating operational amplifiers

Publication Year: 1981, Page(s):925 - 926
| | PDF (291 KB)

The letter describes a novel switched capacitor differential integrator circuit, useful for filtering and analogue/digital conversion applications. It uses a bucket-brigade type charge transfer to eliminate operational amplifiers. This results in reduced chip area, static power and noise. Enhancement-type NMOS transistors and MOS capacitors are used and only a single power supply is required. View full abstract»

• ### Ultrabroadband GaAs monolithic amplifier

Publication Year: 1981, Page(s):927 - 928
Cited by:  Papers (6)
| | PDF (904 KB)

A 500 kHzÂ¿2.8 GHz, 13.5 dB GaAs monolithic amplifier has been developed for gigabit baseband pulse amplification. Input VSWR was reduced using inter-gate-drain negative feedback. The interstage circuit is a DC coupled circuit consisting of a high impedance transmission line. View full abstract»

• ### 4 Gbit/s pseudo-noise generator using GaAs MESFETs

Publication Year: 1981, Page(s):928 - 929
Cited by:  Papers (2)
| | PDF (528 KB)

A multiplexing gate using GaAs MESFETs is described and operation up to 4 Gbit/s is demonstrated. A 2 Gbit/s pseudo-noise generator which can deliver NRZ or RZ signals has been implemented with this circuit; the corresponding output sequences are shown. View full abstract»

• ### Parasitic compensated switched capacitor circuits

Publication Year: 1981, Page(s):929 - 931
Cited by:  Papers (22)
| | PDF (453 KB)

A parasitic-insensitive switched capacitor circuit is presented which can functionally replace the toggle-switchedÂ¿ capacitor. Its properties are established via an inverting integrator application. A related parasitic-insensitive realisation is also shown for a noninverting integrator, which can provide a 3/2 clock period transmission delay. View full abstract»

• ### External cavity controlled single longitudinal mode laser transmitter module

Publication Year: 1981, Page(s):931 - 933
Cited by:  Papers (31)
| | PDF (412 KB)

A GaInAsP/InP laser transmitter module incorporating an external cavity is described. It is shown that the cavity produces stable tunable single longitudinal mode operation of the laser even under high speed modulation conditions. View full abstract»

• ### Spontaneous emission factor of narrow-stripe gain-guided diode lasers

Publication Year: 1981, Page(s):933 - 934
Cited by:  Papers (12)
| | PDF (280 KB)

The spontaneous emission factor of narrow-stripe gain-guided diode lasers, which is of importance in determining time-response and longitudinal-mode structure, is shown to be one order of magnitude greater than previously supposed. View full abstract»

• ### Cylindrical concave diffraction grating utilising thin silicon chip

Publication Year: 1981, Page(s):934 - 936
Cited by:  Papers (1)
| | PDF (464 KB)

A unique manufacturing method for concave diffraction gratings is proposed. Also, a cylindrical concave diffraction grating was manufactured with a multimode slab waveguide. A silicon plane diffraction grating was bent cylindrically in this method. The efficiency of the concave diffraction grating was 82% at a 1.3 Â¿m wavelength. The efficiency was about the same as that of the plane diffraction g... View full abstract»

• ### Erratum: Groove GaInAsP laser on semi-insulating InP

Publication Year: 1981
| | PDF (104 KB)

First Page of the Article
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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