Digital/analog converter and method using voltage distribution

Details Digital/analog converter and method using voltage distribution Digital/analog converter and method using voltage distribution

1998-12-10

2000-12-26

JeanPierre, Peguy

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341154, H03M 166

Patent

active

061666726

ABSTRACT:
A D/A (digital/analog) converter and method are provided that includes a first switching unit having 2.sup.N switches connected in parallel to respective nodes that each receive a corresponding voltage of a distributed reference voltage and being switched in accordance with an M-bit decoding signal output from the decoding unit. The 2.sup.N switches of the first switching unit can be divided into 2.sup.M groups each having 2.sup.L switches. The distributed voltage can be provided to the respective nodes using a resistance array, a resistor string or the like. A second switching unit has 2.sup.N switches connected in parallel between the first switching unit and respective output nodes and are switched in accordance with an L-bit decoding signal output from the decoding unit. The 2.sup.N switches of the second switching unit can be divided into 2.sup.M groups each having 2.sup.L switches. A third switching unit having 2.sup.M switches connected in parallel between the respective output nodes and an output terminal are switched in accordance with the M-bit decoding signal output. The converter decreases the time constant by the parasite capacitance and generates a high speed analog output voltage.

REFERENCES:
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patent: 5703588 (1997-12-01), Rivoir et al.
patent: 5831566 (1998-11-01), Ginetti
patent: 5977898 (1999-11-01), Ling et al.
Allen, Phillip et al., "CMOS Analog Circuit Design", 1987, Chapter 10, p. 532.

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