Dual gate FET mixing apparatus with feedback means

Details Dual gate FET mixing apparatus with feedback means Dual gate FET mixing apparatus with feedback means

1987-12-18

1989-03-21

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

3072191, 307304, 328 15, 455333, H03B 1900, H03K 3353

Patent

active

048146498

ABSTRACT:
When a dual gate FET is used in a mixing type circuit, the non-linear characteristics of an over-driven gate on the FET is used to create the sum and difference of the gate applied signals at the drain of the FET. Although feedback typically is used to increase the linearity of a class A amplifier where a single gate FET is used, the feedback in the present circuit overcomes the problem of maintaining a stable operating point for the mixer circuit while not interfering with the performance of the FET as a mixer. Thus, with the feedback to the first gate, the sensitivity of the DC bias on the second gate is decreased and can be set with simple (wide tolerance) components.

REFERENCES:
patent: 4112373 (1978-09-01), Miyamoto
patent: 4264981 (1982-04-01), Vilimek
patent: 4308473 (1981-12-01), Carnes

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