Varactor trimming for MMICs

Details Varactor trimming for MMICs Varactor trimming for MMICs

1986-10-08

1988-01-12

Gensler, Paul

Wave transmission lines and networks

Coupling networks

With impedance matching

333 33, 333246, H03H 1128

Patent

active

047194340

ABSTRACT:
Varactors are incorporated in a monolithic microwave integrated circuit (MMIC) to provide voltage-programmable impedance matching at inputs and/or outputs. This permits the impedance variations normally caused by manufacturing variations in (e.g.) doping or epitaxial thickness to be easily compensated by adjusting the varactor bias, after all major manufacturing steps are completed.
Integrated varactors are also used to provide temperature compensation in an MMIC. A temperature-sensitive voltage is generated off-chip and supplied to each on-chip varactor. Each varactor may include a respective voltage-shifting network, so that different varactors implement different capacitance (temperature) functions, to optimally compensate different portions of the MMIC.

REFERENCES:
patent: 3132313 (1964-05-01), Alford
patent: 3404320 (1968-10-01), Mash
patent: 3412348 (1968-11-01), Hull
patent: 3745487 (1973-07-01), Milard et al.
patent: 3831109 (1974-08-01), Leiby
patent: 4048598 (1977-09-01), Knight
patent: 4189690 (1980-02-01), Bock et al.
patent: 4243949 (1981-01-01), Saul et al.
Van Tuyl, A Monolithic GaAs FETRF Signal Generation Chip, 1980 IEEE Int'l. Solid-State Circuits Conference, pp. 118, 119 of Digest of Tech. Papers.

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