Accession Number : AD0815982

Title :   MICROWAVE TRANSISTORS.

Descriptive Note : Quarterly rept. no. 7, 1 Dec 66-28 Feb 67,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS SEMICONDUCTOR-COMPONENTS DIV

Personal Author(s) : Anderson,Andy ; Boone,David ; Cooke,Harry ; Dennis,Charlie ; Lange,Julius

Report Date : JUN 1967

Pagination or Media Count : 70

Abstract : Planar double-diffused germanium transistors were fabricated using phosphorus-doped silicon diode as a mask. Base-collector time constants below 1.2 psec and frequencies above 7 GHz have been achieved consistently. The noise-figure objective of 5 dB at 3 GHz has been met within 0.5 dB. Gains of over 6.5 dB at 3 GHz have been achieved consistently. Silicon nitride masks and heavily doped base contact areas are being investigated. Improved versions of the TI C-band and miniature coaxial transistor packages were fabricated, and low VSWR test fixtures were built for both packages. An alternate method for measuring unilateral gain has been implemented. Final versions of the S- and C-band oscillators have been built on ceramic but not tested. One of the final S-band amplifiers has been completed and tested. Gain was 12 dB, noise figure 7 dB. The tunable filter for the S-band front end has been started with a theoretical study on coupled transmission lines. An image-terminated mixer in thin-film form showed a 3-dB improvement in noise figure over a broadband version. An S-band mixer on a high K substrate was constructed. Thin-film capacitors are being successfully used on several of the circuits. Work on packaging of the two receiver front ends has been started with a preliminary layout. (Author)

Descriptors :   (*MICROWAVE EQUIPMENT, *TRANSISTORS), GERMANIUM, C BAND, S BAND, SUBSTRATES, PACKAGED CIRCUITS, DOPING, MASKING, SILICON DIOXIDE, PHOSPHORUS COMPOUNDS, MINIATURE ELECTRONIC EQUIPMENT, OSCILLATORS, CERAMIC MATERIALS, TRANSISTOR AMPLIFIERS, GAIN, BROADBAND, MANUFACTURING, ACOUSTIC FILTERS, MIXERS(ELECTRONICS), DIELECTRIC PROPERTIES, NOISE(RADIO), PERFORMANCE(ENGINEERING)

Subject Categories : Electrical and Electronic Equipment
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE