Digital to analog converter with a reduced resistor count

Details Digital to analog converter with a reduced resistor count Digital to analog converter with a reduced resistor count

1997-10-09

1999-08-17

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

H03M 166

Patent

active

059400200

ABSTRACT:
This invention describes a DAC requiring a substantially lower number of resistors for conversion of n+p digital bits. The conversion to an analog signal is done in two voltage dividers. The first voltage divider contains 2.sup.n resistors and is referenced to a voltage bias. The second voltage divider contains 2.sup.p resistors and is referenced to a current bias. The current bias is derived from a current mirror which references the current in the first voltage divider. The use of the current mirror allows all resistors in the DAC to be of the same value which in turn provides an implementation with better accuracy and resistor matching. The number of resistors required to make a conversion of a 12 bit digital signal is 272 where 8 bits are converted in the first voltage divider and 4 bits are converted in the second voltage divider.

REFERENCES:
patent: 4918448 (1990-04-01), Hauriller et al.
patent: 5111205 (1992-05-01), Morlon
patent: 5252975 (1993-10-01), Yuasa et al.
patent: 5495245 (1996-02-01), Ashe
patent: 5554986 (1996-09-01), Neidorff

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