Digital-to-analog converter circuit

Details Digital-to-analog converter circuit Digital-to-analog converter circuit

1988-02-26

1989-12-05

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, 341144, H03M 100

Patent

active

048855812

ABSTRACT:
For reduction in component elements, there is disclosed a digital-to-analog converter circuit for converting a digital input signal consisting of high-order bits and low-order bits into an analog output signal, comprising, (a) a first digital-to-analog converting circuit operative to produce a first current the amount of which corresponds to a value represented by the high-order bits, (b) a memory circuit storing an error data information in each address specified by each of values represented by the high-order bits, (c) an arithmetic circuit operative to carry out arithmetic operations on the low-order bits and the error data information to produce amended low-order bits, (d) a second digital-to-analog converting circuit operative to produce a second current the amount of which corresponds to a value represented by the amended low-order bits, and (e) an analog adder operative to add the first current weighted by a predetermined factor to the second current to produce an analog output signal, so that the analog output signal precisely corresponds to the digital input signal.

REFERENCES:
patent: 4340882 (1982-07-01), Maio et al.
patent: 4523182 (1985-06-01), Harvey et al.
patent: 4617551 (1986-10-01), Ophoff

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