Delta-sigma converter with bandpass filter for noise reduction i

Details Delta-sigma converter with bandpass filter for noise reduction i Delta-sigma converter with bandpass filter for noise reduction i

1990-05-25

1991-06-25

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

375 27, H03M 300

Patent

active

050271202

ABSTRACT:
Analogue signals are converted to digital data by use of a Sigma-Delta modulator including a pair of bandpass filters and a feedback loop including a digital to analogue converter. The tendency of such a circuit to instability is reduced or eliminated by making small variations in the phase of a clock controlling feedback pulses relative to a clock controlling data output pulses. As an alternative, corrections may be made to the feedback pulses by an additional feedback loop providing pulses for correcting the feedback pulses.

REFERENCES:
patent: 3723909 (1973-03-01), Condon
patent: 4467291 (1984-08-01), Roza
patent: 4528551 (1985-07-01), Agrawal et al.
patent: 4772871 (1988-09-01), Suzuki et al.
patent: 4857928 (1989-08-01), Gailus
patent: 4958158 (1990-09-01), Hashizume et al.

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