|
1. |
The spice of life |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 387-387
Preview
|
PDF (170KB)
|
|
DOI:10.1049/ree.1984.0089
出版商:IERE
年代:1984
数据来源: IET
|
2. |
Some thoughts on trends in british defence r and d |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 388-389
D.H.Parkinson,
Preview
|
PDF (347KB)
|
|
DOI:10.1049/ree.1984.0090
出版商:IERE
年代:1984
数据来源: IET
|
3. |
Books received |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 391-392
Preview
|
PDF (424KB)
|
|
DOI:10.1049/ree.1984.0096
出版商:IERE
年代:1984
数据来源: IET
|
4. |
Current mode control of switching regulators |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 395-405
M.Goodman,
O.Kuhlmann,
Preview
|
PDF (1072KB)
|
|
摘要:
By adapting the forward converter range of switching regulators to include an additional current-controlled feedback loop, derived from either the secondary or primary power circuit, an improvement in the closed-loop performance of the switching regulator can be obtained.The basic analysis work examines the simple single-ended forward converter, with d.c. plus a.c. current control, derived from the secondary power circuit. An additional fixed voltage ramp is also included in the control loop to provide ‘feedforward’ compensation for input voltage disturbances, and also to extend the maximum duty cycle from 50% up to 100%.Using this circuit configuration a simple small signal equivalent circuit for the current-controlled switching regulator can be obtained, enabling the performance of practical designs to be predicted.Practical implementation of the current mode control technique using a standard large-scale integrated circuit together with a number of applications is also given.
DOI:10.1049/ree.1984.0097
出版商:IERE
年代:1984
数据来源: IET
|
5. |
Evaluation of proprietary optical fibre transmission systems |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 406-410
F.G.Harrison,
Preview
|
PDF (531KB)
|
|
摘要:
The paper describes a comprehensive evaluation programme being carried out on optical fibre transmission systems, both in a field environment and also under controlled conditions in the laboratory. The work is providing detailed information on the performance of optical fibre systems from a number of commercial sources, in particular by monitoring the overall error performance and by measuring variations of parameters incorporated in the optical power budget. A data logging arrangement, which collects information from operational systems, and the laboratory test schedule are described. An overview of the results obtained to date is given, which concludes by validating the integrity of optical systems design.
DOI:10.1049/ree.1984.0098
出版商:IERE
年代:1984
数据来源: IET
|
6. |
Harmonic torques in two-phase induction motors using six-step drives |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 411-414
P.Atkinson,
P.R.Savage,
Preview
|
PDF (439KB)
|
|
摘要:
The use of six-step drives for two-phase induction motors supplied from controlled d.c.-a.c. inverters promises a new lease of life for a.c. machines in position control applications. Unfortunately the steady-state static torque produced when both windings are simultaneously controlled by six-step waveforms in quadrature is reduced from that predicted by a fundamental analysis due to the presence of third harmonic in the waveform. There is also a significant oscillatory component of torque present with a frequency of four times line frequency. Although these effects have been observed in the past, no attempt has been made previously to provide a coherent analytical explanation. This paper presents such an explanation using a Fourier analysis in conjunction with the generally accepted motor model.
DOI:10.1049/ree.1984.0099
出版商:IERE
年代:1984
数据来源: IET
|
7. |
Current problems in v.l.s.i. testing and testability |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 415-423
P.K.Lala,
Preview
|
PDF (1166KB)
|
|
摘要:
This paper presents the basic concepts in testing, beginning with fault-models, and summarizes the major contributions to the design of testable logic. It identifies some of the current problems in v.l.s.i. testing and testability which need further investigation.
DOI:10.1049/ree.1984.0100
出版商:IERE
年代:1984
数据来源: IET
|
8. |
A second-generation scpc system for business satellite communications |
|
Radio and Electronic Engineer,
Volume 54,
Issue 10,
1984,
Page 424-430
D.Mcgovern,
R.J.Kernot,
Preview
|
PDF (799KB)
|
|
摘要:
The European Telecommunications Administrations are planning to offer Business Satellite Services from the beginning of 1985. Designed under the auspices of EUTELSAT, the Satellite Multiservice System (SMS) operates in the 14/12.5 GHz bands and will use two satellites: the European Communications Satellite (ECS), and capacity leased on the French domestic satellite, Telecom 1. This paper describes the ECS SMS and in particular the Single Channel Per Carrier (SCPC) access system. This system operates over a range of data rates from 64 kbit/s to 2 Mbit/s and incorporates a number of novel features including satellite-link encryption, the use of soft-decision error correction, and full support of terrestrial interface standards.
DOI:10.1049/ree.1984.0101
出版商:IERE
年代:1984
数据来源: IET
|
|