Digital to analog converter circuit

Details Digital to analog converter circuit Digital to analog converter circuit

1991-12-02

1994-10-11

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 166

Patent

active

053551346

ABSTRACT:
The present invention provides a digital to analog converter circuit comprising a digital to analog converter portion for accepting digital inputs indicative of a signal level and for producing an analog output indicative of a difference in signal level between one digital input and a previous digital input. An integrator is coupled to the digital to analog converter portion for integrating the analog output thereby producing a substantially smooth waveform. The digital to analog converter portion may comprise a plurality of current source type digital to analog converters having a common output terminal and the integrator may comprise an integrating capacitor. In such an embodiment the output from the common output terminal is indicative of a signal level difference determined by at least two of the digital inputs.

REFERENCES:
patent: 4591832 (1986-05-01), Fling et al.
patent: 4972188 (1990-11-01), Clement et al.
patent: 5008674 (1991-04-01), DaFranca et al.
In re Lincoln and Henriksen, 66 USPQ 240.
Hewlett-Packard Journal, "An Arbitrary Waveform Synthesizer for DC to 50 Mz", Apr. 1988, vol. 69-77, by Roland Hassun and Albert W. Kovalick.
Hewlett-Packard Journal, "Analog Output System Design for Multifunction Synthesizer", Feb. 1989, vol. 66-69, by Thomas Higgins, Jr.

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