Digital to analog converter having a single cyclic resistor...

Details Digital to analog converter having a single cyclic resistor... Digital to analog converter having a single cyclic resistor...

2007-10-16

2007-10-16

Mai, Lam T. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S144000

Reexamination Certificate

active

11324427

ABSTRACT:
A current driven DAC architecture uses a single resistance string arranged to have a cyclic configuration and a plurality of nodes, one of the nodes being connected to a known potential, e.g., ground potential, and at least two current sources connected to selected ones of said nodes through operable switches, and an output connected to a selected one of said nodes. In one modification, 22n−2LSB (least significant bit) voltage levels are generated as outputs from 2ncyclic string resistors and two current sources. In another modification, spurious-free resolution of (2n−2) bits and (2n−1) bit resolution with lower SNDR are achieved by using 2nresistors and two current sources. In one described embodiment, 2nunit impedances in the cyclic string result in 2(n−1) bit resolution. Thus, the single cyclic string of resistances achieves the function of both MSB sub-string and LSB sub-string.

REFERENCES:
patent: 5283580 (1994-02-01), Brooks et al.
patent: 5604501 (1997-02-01), McPartland
patent: 5619203 (1997-04-01), Gross, Jr. et al.
patent: 6621440 (2003-09-01), Gorman
patent: 6977604 (2005-12-01), Wada et al.
patent: 7088277 (2006-08-01), Kobayashi et al.

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