CPC G01R 29/0892 (2013.01) [G01N 22/00 (2013.01); G01N 22/04 (2013.01); G01N 27/02 (2013.01); A61B 5/0031 (2013.01); A61B 5/05 (2013.01); A61B 2560/0219 (2013.01)] | 8 Claims |
1. A signal detection circuit, comprising:
a resonator connected to an object to be measured; and
an interferometer circuit which is connected to the object to be measured and the resonator and models a magnitude and a phase of a transmission coefficient of the resonator,
wherein the interferometer circuit includes:
an attenuator which is connected to the resonator in parallel and models the magnitude of the transmission coefficient of the resonator;
a phase shifter which is connected to the resonator and models the phase of the transmission coefficient of the resonator;
a first hybrid coupler which is connected to the resonator and the attenuator and generates a 90-degree phase difference; and
a second hybrid coupler which is connected to the object to be measured and the phase shifter and generates a 90-degree phase difference.
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