Switched capacitance feedback control circuit and sigma-delta mo

Details Switched capacitance feedback control circuit and sigma-delta mo Switched capacitance feedback control circuit and sigma-delta mo

1985-03-14

1986-07-15

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 9T, 375 28, H03K 700

Patent

active

046009019

ABSTRACT:
The present invention discloses a feedback control circuit in which the input and feedback signals are processed by making use of the same capacitance so that there is no problem of capacitance matching. Another aspect of the invention is a sigma-delta modulator in which the processing means includes integration means which are able to integrate said sampled and added input and feedback signals and to provide an analog output signal, a one-bit analog-to-digital converter providing a digital output signal in response to said analog output signal, and a one-bit digital-to-analog converter providing said feedback signal in response to said output signal, said input signal being sampled and simultaneously said converters being operated by and during first of said timing signals, while by and during second of said timing signals said feedback signal is sampled and said input and feedback signals are added and integrated, said first and second timing signals being non-overlapping and defining a sampling period. Thus a relatively long time is available for the sampling of the input and feedback signals as well as for the operation of the converters, even when the sampling period is relatively short.

REFERENCES:
patent: 4504803 (1985-03-01), Lee et al.

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