Circuit arrangement for A/D and/or D/A conversion with nonlinear

Details Circuit arrangement for A/D and/or D/A conversion with nonlinear Circuit arrangement for A/D and/or D/A conversion with nonlinear

1983-06-24

1986-06-10

Smith, Jr., David

Communications: electrical

Audible indication

Percussion-type sound producer

340347DA, H03K 1302, H03K 1304

Patent

active

045945764

ABSTRACT:
In an analog-to-digital (A/D) converter or a digital-to-analog (D/A) converter, a nonlinear D/A converter is employed. The nonlinear D/A converter comprises an absolute value circuit, a D/A converter, and another D/A converter having a function of multiplication. The latter D/A converter is responsive to a digital signal and to an analog signal from the former D/A converter so as to produce an analog signal indicative of the square of the digital signal. In an A/D converter, the nonlinear D/A converter is put in a negative feedback loop following an output of a successive approximation register so as to produce a reference signal with which an input analog signal to be converted will be compared by a comparator. The invention enables A/D conversion of a wide dynamic range signal by using a small number of bits, while quantization noise with respect to a low level signal is maintained low.

REFERENCES:
patent: 3533098 (1970-10-01), Munoz
patent: 3544993 (1970-12-01), Gabriel
patent: 3573795 (1971-04-01), Bowers, Jr.
patent: 3670326 (1972-06-01), Sloan et al.
patent: 3760407 (1973-09-01), Terry
patent: 3877026 (1975-04-01), Wintz et al.
patent: 3997892 (1976-12-01), Susset
patent: 4350974 (1982-09-01), Gordon et al.

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