Delta-sigma modulator

Details Delta-sigma modulator Delta-sigma modulator

1989-02-10

1990-04-24

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 34, 341143, H04B 1404

Patent

active

049205447

ABSTRACT:
The delta-sigma modulator includes a secondary delta-sigma modulator which carries out a secondary delta-sigma modulation for an analog input signal, thereby producing a first quantization signal. A quantization noise extractor extracts a quantization noise occurring in the secondary delta-sigma modulator. A primary delta-sigma modulator carries out a first delta-sigma modulator for the quantization noise, thereby producing a second quantization signal. A differentiating circuit differentiates the second quantization signal supplied from the primary delta-sigma modulator. An adder adds the first quantization signal and an output signal of the differentiating circuit, thereby producing a digital output signal corresponding to the analog input signal.

REFERENCES:
patent: 4009475 (1977-02-01), DeFreitas
patent: 4433311 (1984-02-01), Noguchi et al.
patent: 4439756 (1984-03-01), Shenoi et al.
patent: 4528551 (1985-07-01), Agrawal et al.
patent: 4588981 (1986-05-01), Senn
patent: 4772871 (1988-09-01), Suzuki et al.
Y. Matsuya et al., "SAMPLED-DATA ANALOG LOGIC", 1987 IEEE International Solid-State Circuits Conference, Feb. 1987, pp. 48-49.

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