D/A converter circuit

Details D/A converter circuit D/A converter circuit

2008-06-12

2009-12-29

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S144000, C341S154000

Reexamination Certificate

active

07639166

ABSTRACT:
A multi-bit D/A converter circuit that prevents a bit inversion and requires a reduced layout area is offered. A first switching circuit is provided in order to select a pair of analog voltages generated across one of resistors in a first resistor string. The selected pair of analog voltages is provided as reference voltages to a second resistor string. A second switching circuit is provided in order to select a pair of analog voltages generated across one of the resistors in the second resistor string. The selected pair of analog voltages is provided as reference voltages to a third resistor string. A third switching circuit is provided in order to select one of analog voltages generated in the third resistor string.

REFERENCES:
patent: 3997892 (1976-12-01), Susset
patent: 4638303 (1987-01-01), Masuda et al.
patent: 5495245 (1996-02-01), Ashe
patent: 5977898 (1999-11-01), Ling et al.
patent: 6384762 (2002-05-01), Brunolli et al.
patent: 6781536 (2004-08-01), Martins
patent: 10-135836 (1998-05-01), None

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