US 6,178,319 B1 · Microwave mixing circuit and down-converter

Abstract

A microwave mixing circuitry has a plurality of microwave signal input terminals, a local oscillator for outputting a local oscillation signal for the purpose of generating an intermediate frequency signal from the microwave signal input by the microwave signal input terminals, and a plurality of field effect transistors (“FET”) for frequency converting. The FET gates are input with the microwave signal input from microwave signal input terminals. The FET drains are input with an output of the local oscillator. A plurality of gate voltage control circuitries control gate voltages of the FETs thereby causing one of the FETs to perform nonlinear operation while turning off another of FETs at the same time. An intermediate frequency signal output terminal outputs the intermediate frequency signal produced by the nonlinear operation of one of the FETs.

Claims19

Dependent claims

Microwave mixing circuitry comprising:

a plurality of separate microwave signal input terminals each for receiving a horizontally polarized wavesignal and a vertically polarized wave signal, repsectively;
local oscillator for geneating a local oscillation signal;
a plurality of mixing circuitries for mixing each of said horizontally polarized wave signal and said vertically polarized wave signal, said mixing circuitries include field effect transistors (“FETs”) having gates coupled to said microwave signal input terminals, and drains which are coupled to said local oscillator;
a plurality of control circuitries for enabling operation of one of said mixing circuitries while preventing operation of another of said mixing circuitries to produce an intermediate frequency signal;
and
an intermediate frequency signal output terminal for outputting the intermediate frequency signal produced by the operation of one of said mixing circuitries.

3 more elements

Dependencies are inferred from the claim text.

Microwave mixing circuit and down-converter

Life of this patent

Microwave mixing circuit and down-converter

Life of this patent

Abstract

Claims19