Receiver including fet frequency mixer

Details Receiver including fet frequency mixer Receiver including fet frequency mixer

H - Electricity

03

D

325/104, 325/115

H03D 7/12 (2006.01) H03G 3/22 (2006.01) H03G 3/30 (2006.01) H04B 1/28 (2006.01)

Patent

CA 1200851

ABSTRACT A receiver comprises an FET frequency mixer having first and second gate electrodes, a local oscillator, a first AGC amplifier and a second AGC amplifier. The first AGC amplifier is coupled to the first gate electrode for varying the gain of a high frequency signal in response to a control signal and the second AGC amplifier is coupled to the second gate electrode for varying the gain of the output signal of the local oscillator. A generator coupled to the output of the FET mixer generates the control signal. By controlling the gain of the second AGC amplifier, the IF signal output level of the FET mixer is made controllable and, moreover, the range in which the conversion gain MGT is equivalently controllable can be expanded to be as wide as the gain control range of the local AGC amplifier. In this way the dynamic range of the FET mixer can be equivalently expanded to equal the AGC dynamic range of the second AGC amplifier.

422016

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