Charge balanced feedback transmitter

Details Charge balanced feedback transmitter Charge balanced feedback transmitter

1988-06-10

1989-10-31

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

324 60R, 34087037, G01R 2726

Patent

active

048780120

ABSTRACT:
A charge balanced feedback type transmitter generates charge packets representative of a sensed parameter. Improved performance is achieved by the additiion of resistance connected between a charge packet generating reactance and an integrator to reduce the effects of noise caused by switching transients and by ground noise which is coupled to the charge packet generating circuitry by stray capacitance. The charge packets are integrated by the integrater, and the integrator output is supplied from a selective basis to the input of a comparator. The output of the comparator is used to control the application of charge packets to the integrator to achieve charge balance. The input of the comparator is selectively connected to the output of the integrator, to a first supply voltage, or to a second supply voltage to ensure a stable output of the comparator at a critical time when charge is being supplied to the integrator.

REFERENCES:
patent: 4054833 (1977-10-01), Briefer
patent: 4187459 (1980-02-01), Wolfendale
patent: 4322977 (1982-04-01), Sell et al.
patent: 4644798 (1987-02-01), Tamura et al.
patent: 4743836 (1988-05-01), Grzybowski et al.

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