Dual gate FET mixing apparatus with feedback means
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United States of America Patent
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Mar 21, 1989
Grant Date -
N/A
app pub date -
Dec 18, 1987
filing date -
Dec 18, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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