Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Patent
1997-11-18
1999-10-19
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
341145, H03M 178
Patent
active
059696583
ABSTRACT:
A digital-to-analog converter includes an input circuit (9) producing a plurality of corresponding switch control signals (25) in response to a digital input signal (D.sub.IN) and a resistive ladder network (10A) including an R/2R MSB ladder section (2) including a plurality of "R" resistors (17) and a plurality of "2R" resistors (5), and an R/2R LSB ladder section (3) including a plurality of "R" resistors (17) and a plurality of "2R" resistors (5). A scaling resistor (21) is coupled between a least significant node conductor (7-3) of the MSB ladder section and a most significant node conductor (7-4) of the LSB ladder section. A plurality of switch circuits (6) each selectively conducts a respective parallel resistor circuit (5) to a first reference voltage conductor (VREFH) or a second reference voltage conductor (VREFL) in response to the various switch control signals (25). The resistances of the resistors of the "R" resistors of the MSB ladder section are different than the resistances of the resistors of the "R" resistors of the LSB ladder section. The resistances of the "R" resistors of the MSB ladder section, the resistances of the "R" resistors of the LSB ladder section, and the resistance of the scaling resistor are related by the expression R"=2R-R', where R" is the resistance of a scaling resistor, R is the resistance of the "R" resistors of the MSB ladder section, and R' is the resistance of the "R" resistors of the LSB ladder section.
REFERENCES:
patent: 3728719 (1973-04-01), Fish
patent: 4150366 (1979-04-01), Price
patent: 4396907 (1983-08-01), Wintzer et al.
patent: 4542368 (1985-09-01), Lillis
patent: 4929923 (1990-05-01), Dharmadhikari
Burr-Brown Corporation
Hoff Marc S.
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