H - Electricity – 03 – D
Patent
H - Electricity
03
D
325/106, 325/83
H03D 7/00 (2006.01) H03D 3/00 (2006.01) H03F 7/04 (2006.01) H03G 3/30 (2006.01) H04B 1/26 (2006.01)
Patent
CA 1139846
ABSTRACT OF THE DISCLOSURE A receiver input circuit composed of an upper side- band parametric down converter for converting a high frequency input signal into an intermediate frequency; a signal demodulator having a signal input connected to the output of the converter; a controllable oscillator connected in a control loop with the converter and the demodulator for supplying the converter with a pump signal which follows the intermediate signal in frequency and phase and which has a frequency equal to twice the intermediate frequency such that the sum of the pump signal frequency and the intermediate frequency equals three times the intermediate frequency; and a real resistance terminating the converter at the image frequency corresponding to the established pump sig- nal and intermediate frequencies, whereby the circuit has an available power gain greater than unity and an improved signal to noise ratio ahead of the demodulator.
341971
Maurer Robert
Petry Hans P.
Fetherstonhaugh & Co.
Licentia Patent-Verwaltungs-Gmbh
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