Sensor drive circuit

Details Sensor drive circuit Sensor drive circuit

1995-04-11

1996-12-31

Arana, Louis M.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324656, G01R 2728

Patent

active

055897789

ABSTRACT:
A sensor drive circuit which accurately detects the amount of variation in inductance of a coil serving as a variable sensor. A peak detector circuit detects a peak value of a difference signal between a variable-amplitude signal and an intermediate signal to output a peak detection signal as a verification signal to a first input of an error amplifier. The error amplifier has a second input receiving a reference voltage and outputs a control signal to an AGC circuit on the basis of the result of comparison between the peak detection signal and the reference voltage. A peak detector circuit detects a peak value of a difference signal between the variable-amplitude signal and an inverted variable-amplitude signal to output the peak value as an inductance detection signal to the exterior. The AGC circuit performs automatic gain adjustment to output a signal of determined amplitude to a buffer in response to the control signal from the error amplifier.

REFERENCES:
patent: 4258315 (1981-03-01), Westra
patent: 5202628 (1993-04-01), Locher et al.
patent: 5332966 (1994-07-01), Berberich

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