DOI:10.1049/ree.1973.0063

出版商:IERE    

年代:1973

数据来源: IET

摘要:

The paper describes the adaption of a v.h.f. surveillance receiver for reception of suppressed-carrier double-sideband signals by means of a synchronous demodulator of the 2Ftype employing a digital tracking filter. A theory of operation of the demodulator is developed and its performance under various conditions described. A discussion of the choice of automatic gain control is included. The performance is compared, both in theory and practice, with the performance of the receiver when using an a.m. and a f .m. demodulator.

DOI:10.1049/ree.1973.0064

出版商:IERE    

年代:1973

数据来源: IET

摘要:

Short microwave pulses are generated by feeding c.w. microwave power into a closed, low loss resonant ring of waveguide so that the power circulates and builds up; this power may be released in the form of a short pulse of increased amplitude, by opening a gate controlled by p-i-n diode switch. An experimental system providing a 34 ns pulse with a 2-6 dB amplitude gain is described.

DOI:10.1049/ree.1973.0065

出版商:IERE    

年代:1973

数据来源: IET

摘要:

The various stages in the production of an aluminium electrolytic capacitor are outlined and these are then related to the equivalent circuit so as to establish an understanding of the preparation parameters that affect the performance. Particular reference is made to studies undertaken on the effects of etching prior to anodization, the anodization itself, the electrolyte used and the mechanical construction. In the case of sintered porous tantalum electrolytic capacitors, the parameters are not so well understood but comparisons will be drawn with aluminium capacitors wherever possible.

DOI:10.1049/ree.1973.0066

出版商:IERE    

年代:1973

数据来源: IET

摘要:

By using the electron beam machine to expose an electron sensitive resist and then by use of the 'float-off technique it is possible to produce the necessary permalloy overlay patterns for bubble devices with micron linewidths. Specification of the pattern is by computer program. At higher powers, the electron beam can also be used to damage the bubble material. This damage can be used to constrain the bubble motion.

DOI:10.1049/ree.1973.0067

出版商:IERE    

年代:1973

数据来源: IET

摘要:

In the design of a large high-speed computer, the size of the system leads to long cable delays for data transmitted between different parts of the machine. This problem and the interconnexion of a high-speed e.c.l. circuit family are discussed, and comment is made on future lines of development for technology in high-speed computers.Priority circuits in a large asynchronous system also present difficulties not usually encountered in smaller machines and a discussion of how these difficulties arise is presented.

DOI:10.1049/ree.1973.0068

出版商:IERE    

年代:1973

数据来源: IET

摘要:

A direct conversion radio receiver is described which is characterized by many fewer spurious responses than the conventional superheterodyne, and lends itself to integration in monolithic form.The major design problem derives from the need for an accurate two-phase tunable local oscillator. A circuit is described which uses a servo-controlled phase shifting network, and maintains the two outputs within ±2° of quadrature from 66 to 95 MHz.Complete a.m. and s.s.b. receivers are described, and problems of a.g.c. discussed. The expected relative freedom from spurious responses was confirmed experimentally.

DOI:10.1049/ree.1973.0069

出版商:IERE    

年代:1973

数据来源: IET