Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1996-08-28
1998-03-24
Young, Brian K.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341145, H03M 168
Patent
active
057317747
ABSTRACT:
A digital-to-analog converter includes a D/A converter circuit section, connection switching control circuit and multi-input operational amplifier circuit. The D/A converter circuit section is supplied with a binary code of upper i bits of an n-bit (1.ltoreq.i<n) digital input, outputting a first voltage obtained by subjecting the i-bit binary code to the D/A conversion, and outputting a second voltage which is higher than the first voltage by an amount corresponding to the weight of the least significant bit of the i-bit input. The connection switching control circuit is supplied with the first and second voltages output from the D/A converter circuit section and a binary code of the remaining lower j (1.ltoreq.j<n, j=n-i) bits of the above binary code. The connection switching control circuit decodes the j-bit binary code, selectively outputs the second voltage from the D/A converter circuit section to part of 2.sup.j output nodes according to the result of decoding and selectively outputs the first voltage to the remaining part of the 2.sup.j output nodes.
REFERENCES:
patent: 4388612 (1983-06-01), Takagi
patent: 4618847 (1986-10-01), Iida 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.
Fujii Kazuhito
Kitagawa Nobutaka
Kabushiki Kaisha Toshiba
Young Brian K.
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