Multi-channel digital to analog converter

Details Multi-channel digital to analog converter Multi-channel digital to analog converter

1992-04-13

1994-03-15

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Multiplex

341145, 341154, H03M 168

Patent

active

052949273

ABSTRACT:
A digital to analog converter employs an operational amplifier as an active summing device for summing a first analog voltage corresponding to most significant bits of a digital value and a second analog voltage corresponding to least significant bits of the digital value. In a multi-channel application, a single MSB DAC can be shared by all channels through first MUXs in each channel with each channel having an independent LSB DAC. Alternatively, a single LSB DAC can be shared by all channels through second MUXs in each channel. Gain of the voltage summing operational amplifier in each channel is determined by values of a resistor connecting the output of the LSB DAC to the inverting negative input of the operational amplifier and of a feedback resistor connecting the amplifier output to the inverting negative input.

REFERENCES:
patent: 4146882 (1979-03-01), Hoff, Jr. et al.
patent: 4198622 (1980-04-01), Connolly, Jr. et al.
patent: 4494107 (1985-01-01), Kearns et al.
patent: 4973979 (1990-11-01), Ikeda

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