Ratiometric circuit

Details Ratiometric circuit Ratiometric circuit

1996-04-30

1998-04-28

Karlsen, Ernest F.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

324662, 324678, G01R 2506

Patent

active

057449686

ABSTRACT:
A ratiometric circuit (40) includes a differential capacitive sensor (42) for sensing a change in capacitance, a differential capacitive detector (46) operatively connected to the differential capacitive sensor for detecting a change in the capacitance of the differential capacitve sensor, an error voltage generator (48) operatively connected to the differential capacitve detector for generating a corrective voltage in response to the detected change in capacitance, and a bias circuit (50) operatively connected to the differential capacitive sensor for generating a bias voltage inversely proportional to and independent of a supply voltage for maintaining the ratiometricity between an output voltage of the differential capacitive sensor and the supply voltage.

REFERENCES:
patent: 5205171 (1993-04-01), O'Brien et al.
patent: 5465604 (1995-11-01), Sherman
patent: 5473946 (1995-12-01), Wyse
patent: 5497660 (1996-03-01), Warren
patent: 5540095 (1996-07-01), Sherman

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