Receiver including FET frequency mixer
AssigneeNippon Electric Co., Ltd.
InventorKatsuji Kimura
Life of this patent
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Abstract
A receiver including an FET frequency mixer is disclosed. A local oscillator generates a local oscillator signal which is applied to a first amplifier whose gain is varied as a function of a control signal applied thereto. The output of the first amplifier is applied to a first gate electrode of the FET frequency mixer. A high-frequency signal received by the receiver is applied to a second amplifier whose gain is also controlled by the control signal. The output of the second amplifier is applied to a second gate electrode of the FET frequency mixer. The control signal is generated as a function of the output of the FET mixer.
Claims5
A receiver comprising:
- an FET frequency mixer means having first and second gate electrodes biasing means providing substantially constant dc bias voltages to said mixer means local oscillator means for generating a local oscillator signal;
- first AGC amplifier means coupled to said first gate electrode for varying the level of a high frequency signal received by said receiver in response to a control signal;
- second AGC amplifier means coupled to said second gate electrode and said local oscillator means for varying the level of the said local oscillator signal in response to said control signal;
- and generator means responsive to the output of said FET mixer means for generating said control signal in order to expand the dynamic range of said FET frequency mixer means.
Dependencies are inferred from the claim text.