Delta modulator having optimized loop filter

Details Delta modulator having optimized loop filter Delta modulator having optimized loop filter

1981-11-23

1984-08-21

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375 28, 375 34, H03K 1322

Patent

active

044672918

ABSTRACT:
A delta modulator comprising a feedback loop incorporating a cascade arrangement formed by a difference producer, a loop filter, a two-level quantizer, a clock pulse-controlled sampler and a feedback path. In order to optimize the signal/quantization noise ratio the minimum phase loop filter has such a phase characteristic that the phase shift in the feedback loop caused by the time delay of the sampler is replenished to approximately 180.degree. with a certain margin, in a frequency range up to a certain cut-off frequency, the phase of the loop filter being constant above the cut-off frequency.

REFERENCES:
patent: 3706944 (1972-12-01), Tewksbury
patent: 3896399 (1975-07-01), McDonald

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