Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1986-02-14
1989-01-03
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
375 27, 375 28, 375 33, H03M 302
Patent
active
047960043
ABSTRACT:
A feedback coder, which employs simple CMOS push/pull amplifiers as gain elements, along with a bistable circuit, in its preferred embodiment takes the form of a second-order delta-sigma modulator. The output of the modulator is converted into pulse code modulated words by a finite impulse response filter which incorporates a partial coefficient generator utilizing simplified logic. The generator output is provided to an accumulator in which the stages operate at reduced speed. A simple multiplexer generates a serial output. The entire converter can be integrated on a semiconductor chip of relatively small area.
REFERENCES:
patent: 3825831 (1974-07-01), Ishiguro
patent: 4584659 (1986-04-01), Stikvoort
patent: 4588981 (1986-05-01), Senn
Microelectronic Circuits; Holt, Rinehart, and Winston, 1982; p. 611.
Coyne David
Rich David
Staley Peter
Blum Richard K.
General Instrument Corp.
Shoop Jr. William M.
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