Digital to analog converter

Details Digital to analog converter Digital to analog converter

1995-09-28

1997-07-15

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, H03M 178

Patent

active

056487800

ABSTRACT:
A multi-stage digital to analog converter with increased speed and enhanced accuracy. Multiple resistor ladders are interconnected through switches with the first resistor ladder converting the most significant bits and successive ladders converting lesser significant bits. The resistance values of the resistors of each ladder are greater than those of the preceding ladders in order to minimize inaccuracies due to loading. In one embodiment, the last resistor ladder, processing the least significant bits of the digital word to be converted, is a binary weighted resistor divider. A monolithic fabrication technique includes a common resistor biasing scheme to switch the voltage across parasitic capacitances associated with the resistors in each ladder in common mode, thereby increasing the converter speed.

REFERENCES:
patent: 3890610 (1975-06-01), Cahen
patent: 4363024 (1982-12-01), Brokaw
patent: 4580131 (1986-04-01), Seiler
patent: 5455582 (1995-10-01), Valdenaire
Operation Manual entitled "Model KVD-700 Kelvin-Varley Voltage Divider", dated Jan. 1992, of IET Labs, Inc. 534 Main Street, Westbury, N.Y. 11590, consisting of one cover page, pp. 1-5, p. 53 and Schematic, No. KVD-700-8000, Rev. C.

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