US 11,709,193 B2
Signal detection circuit and sensor with interferometer circuit to sensitively detect small variation in signal size
Jonggwan Yook, Seoul (KR); Chorom Jang, Seoul (KR); and Jinkwan Park, Seoul (KR)
Assigned to UIF (University Industy Foundation), Yonsei University, Seoul (KR)
Filed by UIF (University Industry Foundation), Yonsei University, Seoul (KR)
Filed on Mar. 29, 2022, as Appl. No. 17/707,347.
Claims priority of application No. 10-2021-0042710 (KR), filed on Apr. 1, 2021.
Prior Publication US 2022/0317170 A1, Oct. 6, 2022
Int. Cl. G01R 27/04 (2006.01); G01R 27/32 (2006.01); G01R 29/08 (2006.01); G01N 22/00 (2006.01); G01N 22/04 (2006.01); G01N 27/02 (2006.01); A61B 5/00 (2006.01); A61B 5/05 (2021.01)
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
OG exemplary drawing
 
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.