D/A converter

Details D/A converter D/A converter

2007-07-11

2008-11-18

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S155000, C341S154000

Reexamination Certificate

active

07453385

ABSTRACT:
A D/A converter includes: an (N−1)-stage reference resistor group; an N-stage reference resistor group; inter-stage op-amps applying a divided voltage outputted from voltage taps of the (N−1)-stage reference resistor group, across both ends of the N-stage reference resistor group as the Nthreference voltage; a dynamic range expanding means for arranging the voltage taps in the (N−1)-stage reference resistor group so as to expand upward and downward, to expand an input dynamic range in the N-stage reference resistor group; and expansion resistors arranged respectively at both upper and lower ends of the N-stage reference resistor group in response to upward and downward expanded amounts of the dynamic range.

REFERENCES:
patent: 4638303 (1987-01-01), Masuda et al.
patent: 5119095 (1992-06-01), Asazawa
patent: 2003/0141998 (2003-07-01), Matsui
patent: 2005/0128112 (2005-06-01), Miyata et al.
patent: 07-131354 (1995-05-01), None
Iwao Sagara, “Introductíon to A/D and D/A Converting Circuits”, Second Edition, published by Nikkan Kogyo Shimbunsha, Sep. 30, 2004, pp. 268-269.

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