Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1985-07-16
1987-04-14
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73708, 73718, 330282, G01L 912, G01L 1904
Patent
active
046568719
ABSTRACT:
A method and apparatus are described for converting variations in a measured variable (such as pressure) to corresponding variations in an electrical output signal. The preferred method utilizes a capacitive sensor whose capacitance changes to reflect changes in the measured variable. The changes in capacitance are preferably used to vary the gain of a switched-capacitor amplifier whose signal input receives a relatively constant DC reference voltage. The amplifiers' output may be sampled and further amplified to provide an output signal which is indicative of the value of the measured variable.
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"A Switched-Capacitor Digital Capacitance Bridge" by Watanabe et al., IEEE Transactions on Instrumentation and Measurement, Dec., 1984, pp. 247-251.
"Design of Nonlinear Analog Switched-Capacitor Circuits Using Building Blocks" by Mosticka et al., IEEE Transactions on Circuits and Systems; Apr., 1984, pp. 354-367.
Moore John H.
Motorola Inc.
Woodiel Donald O.
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