Microwave mixing circuit and down-converter
First Claim
1. 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.
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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.
124 Citations
19 Claims
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1. Microwave mixing circuitry comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A microwave mixing circuitry with a couple of microwave input signals comprising:
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(a) a couple of microwave signal input terminals each for receiving one of said microwave input signals, (b) a local oscillator for outputting a microwave oscillation signal, (c) a couple of field-effect transistors (“
FETs”
) for mixing said microwave input signals with said microwave oscillation signal,(d) a control circuitry for switching a first FET of said FETs to operative state and switching a second FET of said FETs to inoperative state, (e) an intermediate frequency signal output terminal for outputting an intermediate frequency signal produced by said first FET, wherein said each microwave input signal and said microwave oscillation signal are fed into the gate and the drain of said FETs respectively, and wherein said control circuitry supplies to each gate of FETs a bias voltage which enables one of said FETs to be switched to operative state and the other of said FETs to be switched to inoperative state. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
wherein one arbitrary signal of said microwave input signals (H1, V1, H2, V2) is selectively down-converted to an intermediate frequency signal by using a second control signal fed into said control circuit in order to switch one of said FETs to operative state and the other of said FETs to inoperative state. -
19. The microwave mixing circuitry as recited in claim 18, wherein said control circuitry includes a band-pass filter circuitry which filters a time-varying signal from the control signals fed into said control circuitry and a detector circuitry which produces a dc signal from said time-varying signal.
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Specification