Digital-to-analog conversion circuit

Details Digital-to-analog conversion circuit Digital-to-analog conversion circuit

1990-04-26

1991-05-28

Pellinen, A. D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341137, 341144, H03M 300, H03M 166

Patent

active

050198190

ABSTRACT:
A digital-to-analog conversion circuit capable of preventing a noise produced in a digital system from mixing in an analog output has an input circuit receiving a pulse-code modulated digital signal, a conversion circuit such as a noise shaping circuit for converting the pulse-code modulated digital signal to a pulse wave signal containing analog amplitude information in a time axis direction, a buffer circuit including an electrically insulated coupling circuit such as an optical coupling circuit for transmitting output of the conversion circuit, and an analog output circuit including an analog low-pass filter for delivering out output of the buffer circuit therethrough. A noise generated in a digital system is intercepted by the buffer circuit and is not transmitted further so that mixing of the noise in the analog output circuit is prevented.

REFERENCES:
patent: 3566396 (1971-02-01), Paine
patent: 3836907 (1974-09-01), Nercessian
patent: 4053734 (1977-10-01), Yasunaga
patent: 4617551 (1986-10-01), Ophoff

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