Microwave input circuit with parametric down converter

Details Microwave input circuit with parametric down converter Microwave input circuit with parametric down converter

1977-07-22

1979-06-19

Griffin, Robert L.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

325442, 330 49, H04B 116, H04B 126, H03F 700

Patent

active

041588177

ABSTRACT:
A microwave input circuit including a parametric upper sideband down converter for receiving an input signal whose frequency is not much different from the intermediate frequency produced at the output of the down converter. The down converter may be either of the series type or of the parallel type and has its signal input directly connected to a microwave antenna and terminated by the real antenna resistance (R.sub.g) or the real antenna conductance (G.sub.g), respectively, at the input signal frequency (f.sub.s1). The parametric down converter comprises a cascade connection of a parametric down converter stage and a parametric up converter stage with both of said stages being of the series type or of the parallel type. The down converter stage is terminated at its image frequency (f.sub.sp) with a real resistance (R.sub.sp) or a real conductance (G.sub.sp), respectively, and satisfies the following relationship for a series type down converter: ##EQU1## WHERE R.sub.s1 is the series resistance of the reactance diode in the down converter stage, or the following relationship for a parallel type down converter: ##EQU2## where G.sub.D1 is the conductance loss of the reactance diode in the down converter stage, due to R.sub.s1.

REFERENCES:
patent: 3237017 (1966-02-01), Maurer et al.
patent: 3711780 (1973-01-01), Maurer
patent: 3991373 (1976-11-01), Maurer et al.
"Varactor Applications;" The M.I.T. Press, 1962; Penfield, Jr. et al.
"Parametrischer Mikrowellen-Konoverter," A.E.U., vol. 26, No. 11, 1972, pp. 475-480; Maurer and Locherer.

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