Self-balancing current sources for a delta modulator

Details Self-balancing current sources for a delta modulator Self-balancing current sources for a delta modulator

1982-06-30

1985-07-02

Zazworsky, John

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

307246, 307261, 307362, 328151, H03K 1322

Patent

active

045271330

ABSTRACT:
A delta modulator for controlling time-domain processing of sensed signals, and particularly internal physiological signals. The delta modulator includes two constant current sources both of which are on continuously, but only one of which is connected to the input capacitor at any given time. The two constant current sources are self balancing. Periodically, the two current sources are connected simultaneously to a control capacitor, the potential across which is thus a function of the relative current source amplitudes. The potential across the control capacitor is used in a feedback circuit to control the amplitude of at least one of the current sources so that the two sources are made to have equal amplitudes. Preferably, the control capacitor is an on-chip capacitor whose effective capacitance is increased by the Miller effect.

REFERENCES:
patent: 4124821 (1978-11-01), Petr
patent: 4151473 (1979-04-01), Coleman et al.

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