| 摘要 |
In a microwave circuit for a parametric upper sideband down converter with real image frequency termination conductance, including a pump circuit supplying a pump signal, a parallel circuit at its input, an intermediate frequency circuit at its output, and a reactance diode coupling the parallel circuit and intermediate frequency circuit together, the parallel circuit is tuned approximately to the frequency of the pump signal; the intermediate frequency circuit is composed of a pi filter having a series branch containing a first inductance connected in series between the diode and the output of the microwave circuit, a first shunt branch located between the diode and the inductance and containing a first capacitance and a second shunt branch located between the inductance and the output of the microwave circuit and containing a second capacitance; the microwave circuit further includes a second inductance connected in series with the reactance diode; and the portion of the microwave circuit constituted by the diode, the second inductance and the first capacitance forms a resonant circuit tuned to the frequency of the pump signal.
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