Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1996-08-26
1998-02-03
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341154, H03M 178
Patent
active
057149534
ABSTRACT:
A digital-to-analog converter including first and second D/A converter circuit sections of R-2R ladder resistor type and a third D/A converter circuit section of string resistor type. The first D/A converter circuit section is supplied with a binary code of upper i bits of an n-bit (i<n) digital input and a first offset voltage having the weight of the least significant bit of the binary code and effecting the D/A conversion to output a first analog voltage to a first node. The second D/A converter circuit section is supplied with the binary code of upper i bits of and a second offset voltage having the weight of the least significant bit of the binary code and effecting the D/A conversion to output a second analog voltage which is different from the first analog voltage to a second node. The third D/A converter circuit section is connected between the first and second nodes and subjects a binary code of the remaining lower j bits (j<n, j=n-i, i, j.gtoreq.1) of the digital input to the D/A conversion process to output an analog voltage corresponding to the n-bit digital input.
REFERENCES:
patent: 5225837 (1993-07-01), Hosotani et al.
T. Higuchi et al., "Analog-digital conversion," Nikkan Kogyo Shimbun Ltd. (Jun. 1995), pp. 18-19.
I. Takahashi, "Compact electronic circuit handbook," Maruzen Co. Ltd. (Jan. 1989), pp. 203-204.
Kitagawa Nobutaka
Mitani Hiroshi
Kabushiki Kaisha Toshiba
Young Brian K.
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