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A mixer-first receiver with high linearity and low noise is presented in this paper. Since there is no low noise amplifier (LNA) between the antenna and the mixer, the passive mixer reflecting the baseband impedance makes input impedance matching directly in the receiver. The choice of the operation amplifier (OTA) and the parasitic resistance of the passive mixer both decide the noise of the receiver,...
Linearization technique based on negative series feedback in input cavity of klystrode (by appropriate mismatch of input circuit or inserting additional resistance in it) demonstrates depressing of third order intermodulation on 21 dB and large-signal gain decrease on 2.8 dB. Additional positive voltage feedback can compensate this gain decrease.
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