Digital-to-analog converter

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

1987-07-20

1989-03-07

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341154, H03M 168

Patent

active

048110175

ABSTRACT:
This very high resolution digital-to-analog converter has a highest possible conversion speed as its output voltage corresponding to the input code is determined immediately. The converter has an inherent low impedance bipolar output. A digital error correction is optional.
In one embodiment the converter includes at least one reference signal source and a first resistor network coupled thereto for providing a plurality of reference voltages. In response to MSBs (or LSBs), a multiplexer selects one of the reference voltages which is applied to noninverting input of an operational amplifier. A second resistor network is coupled between the inverting input and output of the operational amplifier, and has a plurality of inputs each exhibiting a respective resistance to the output of the operational amplifier. A demultiplexer couples a current source to one of the second resistor network inputs in response to LSBs (or MSBs). The conversion result is the output voltage of the operational amplifier.

REFERENCES:
patent: 3183360 (1965-05-01), Van Santen
patent: 3895378 (1975-07-01), Marcel
patent: 4198622 (1980-04-01), Connolly
Burr-Brown Staff "Handbook of Operational Amplifier Applications", .COPYRGT.1963, pp. 17-21.

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