Pressure sensitive transducer circuits

Details Pressure sensitive transducer circuits Pressure sensitive transducer circuits

1979-04-19

1981-02-10

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307118, 307308, 307254, 328 5, H03K 326, G01N 2700

Patent

active

042504520

ABSTRACT:
This relates to a circuit for delivering a linear voltage (V.sub.P) which is inversely proportional to the capacitance of a pressure sensitive capacitive transducer. A constant current I.sub.O is alternately switched into a reference capacitor (C.sub.R) and the transducer capacitor (C.sub.P). When the voltage across C.sub.P reaches V.sub.P, a flip-flop is toggled to direct current to C.sub.R. When the voltage across C.sub.R reaches a reference voltage (V.sub.R), the flip-flop is again toggled directing current to C.sub.P. A duty cycle detector charges integrator capacitors until the feedback voltage V.sub.P is such as to render equal the charging times of C.sub.P and C.sub.R.

REFERENCES:
patent: 3384789 (1968-05-01), Teshima
patent: 3462692 (1969-08-01), Bartlett
patent: 3811051 (1974-05-01), Merrell

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