摘要:

A two-lens electron beam machine is designed to give maximum power density in spot diameters ranging from 1.5 μm to 10 μm. The beam is deflected in a raster and modulated by a simple pattern generator. The design and performance of the electron optical system and the present control equipment are discussed together with a proposal for an on-line computer control system

DOI:10.1049/ree.1967.0014

出版商:IERE    

年代:1967

数据来源: IET

摘要:

An experimental investigation of varactor diode junction properties at low temperatures has been performed. Both elemental and compound type diodes have been examined, including two silicon varactors produced by different doping techniques and a diffused mesa-type gallium arsenide varactor. The diode spreading resistance is calculated fromQ-factor measurements with an appropriate correction applied for the loss in the measuring line.

DOI:10.1049/ree.1967.0015

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The use of the field effect transistor in the below pinch-off mode as a variable resistor permits a wide range of phase shifting networks, filters and variable frequency oscillators to be constructed. The technique is fully compatible with integrated circuit technology and the properties of the circuits so produced are only moderately temperature-dependent.

DOI:10.1049/ree.1967.0016

出版商:IERE    

年代:1967

数据来源: IET

摘要:

The characteristics of the electron-beam machine as a welding and cutting tool lend themselves to computer-controlled operation. The paper describes such a combination used to produce a specially-designed microelectronic package. The aim of the system design was to allow the package to be made precisely to the user's requirements by merely reprogramming the computer.Electron-beam techniques are discussed in relation to the micromodule concept, the machine functions which need to be controlled and the other control elements required are described and the computer input-output and interface characteristics are discussed. Programming aspects are also described. Finally, reference is made to future developments that are thought desirable.

DOI:10.1049/ree.1967.0017

出版商:IERE    

年代:1967

数据来源: IET

摘要:

A transistor circuit is described in which the time delay between a trigger pulse and the output pulse, is directly proportional to a control voltage over a 100 : 1 range.The delay circuit is synthesized from circuits performing the functions of ramp generation, voltage comparison and switching. The circuit uses matched dual planar transistors to achieve a temperature coefficient of 0.0025% per deg C, for temperatures between 20°C and 100°C.

DOI:10.1049/ree.1967.0018

出版商:IERE    

年代:1967

数据来源: IET

摘要:

An outline of the electrical design of theUK-3satellite is followed by a statement of the philosophy governing the design of the ground check-out equipment. The principal functions of the latter are described under the general headings of:(1) Test equipment for use close to the satellite.(2) The trailer-mounted data processing and recording station.Among the units specially developed forUK-3, and described, are a 365-day clock and commutator unit employing integrated circuits, and a self-checking off-limit detector.

DOI:10.1049/ree.1967.0019

出版商:IERE    

年代:1967

数据来源: IET