Detecting circuit which suppresses a drift signal

Details Detecting circuit which suppresses a drift signal Detecting circuit which suppresses a drift signal

1994-07-20

1996-03-05

Williams, Hezron E.

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

310316, 25023112, G01P 904

Patent

active

054957591

ABSTRACT:
Between the piezoelectric elements (16a), (16b) for driving and detecting and the piezoelectric element (16c) for feedback of the vibratory gyroscope (12), the oscillation circuit (30) is connected. By the resistors (32), (36), (38), the capacitor (34), the electrostatic capacities of the piezoelectric elements (16a), (16b) and so on, a phase difference of 90 degree is formed between the output signal of the oscillation circuit (30) and the driving signals applied to the piezoelectric elements (16a), (16b). The piezoelectric elements (16a), (16b) are connected to the input terminals of the differential circuit (40). The output signal of the differential circuit (40) is synchronously detected by the FET (46). The output signal of the oscillation circuit (30) is used as the synchronizing signal for synchronously detecting. The detected signal is smoothed by the smoothing circuit (52).

REFERENCES:
patent: 5111083 (1992-05-01), Nakamura
patent: 5220833 (1993-06-01), Nakamura
patent: 5270607 (1993-12-01), Terajima
patent: 5375336 (1994-12-01), Nakamura
patent: 5412204 (1995-05-01), Nakamura

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