High precision, high frequency current sensing and analog signal

Details High precision, high frequency current sensing and analog signal High precision, high frequency current sensing and analog signal

1989-05-31

1991-09-24

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With calibration

34087037, 34087017, G08C 1910, G08C 1922

Patent

active

050517430

ABSTRACT:
An apparatus and method are provided for performing parametric measurements using sensor transducer devices to recover frequency variant, amplitude modulated information from encoded sensory signals. A unique network is employed to achieve low-impedance current sensing in conjunction with analog signal decoding. More particularly, the network includes a circuit for current sensing the desired parameter and providing an analog sensor output signal related to the unit measure (i.e., relative value) of the desired parameter. The network also includes a circuit for receiving the demodulating the sensor output signal to obtain a signal representing the electrical equivalence of the measured parameter. The circuit for demodulating employs synchronous sampling techniques and includes a subcircuit, closed-loop through which the demodulated output is fed for generating an offset or error correcting signal. The offset signal is combined with the sensor output signal to generate a resultant signal reflecting static and dynamic changes in the parameter of interest.

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