Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1989-09-13
1990-12-11
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
73724, H01G 700, G01L 912
Patent
active
049774808
ABSTRACT:
A constant-capacitance capacitor is series-connected with a variable-capacitance capacitor whose capacitance varies with the pressure. The other end of the variable-capacitance capacitor is connected to the ground potential terminal of a D.C. power source. The terminal voltage of the variable-capacitance capacitor is compared with a threshold voltage provided by the D.C. power source by means of a comparator. An output voltage of the comparator is stored into a memory in synchronism with a clock pulse signal. An output voltage of the memory is integrated by an integrator. An output voltage of the integrator is supplied to a buffer amplifier for lowering the signal source impedance with respect to the output voltage. An output voltage obtained from the buffer amplifier is fed back to the other end of the constant-capacitance capacitor and at the same time supplied to an output terminal.
REFERENCES:
patent: 4644798 (1987-02-01), Tamura et al.
patent: 4656871 (1987-04-01), Czarnocki
patent: 4716492 (1987-12-01), Charboneau et al.
patent: 4724709 (1988-02-01), Antonazzi et al.
Fuji Koki Mfg. Co. Ltd.
Griffin Donald A.
Scafetta, Jr. Joseph
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