Digital to analog converter

Details Digital to analog converter Digital to analog converter

2006-11-14

2006-11-14

Barnie, Rexford (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S144000

Reexamination Certificate

active

07136002

ABSTRACT:
The present invention provides an improved Digital to Analog Converter (DAC) of the switched dual string DAC type, which saves on chip surface area, reduces the number of resistors and implementation cost, reduces the self capacitance and the device leakage currents of the circuit elements. The invention provides a guaranteed monotonic DAC architecture, which comprises a switching network for creating three states at a DAC transition node. In one embodiment the invention provides an unloaded state wherein a LSB DAC is de-coupled from a MSB DAC wherein the node between neighboring MSB DAC resistors is coupled to the DAC output. One of the advantages of creating the unloaded state is that the number of LSB DAC resistors is reduced as is normally the case in the prior art for a similar application.

REFERENCES:
patent: 3997892 (1976-12-01), Susset
patent: 4338591 (1982-07-01), Tuthill
patent: 4543560 (1985-09-01), Holloway
patent: 5495245 (1996-02-01), Ashe
patent: 5969657 (1999-10-01), Dempsey et al.

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