Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1995-05-05
1997-11-04
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341154, H03M 118
Patent
active
056844816
ABSTRACT:
A voltage mode digital-to-analog converter (DAC) with an output buffer operational amplifier is provided with a rail-to-rail output voltage capability by reducing the DAC's output voltage swing to a range that is within the amplifier's permissible input signal range, and connecting the amplifier in a multiplier configuration to produce a corresponding multiplication of its input signal. The DAC output reduction is preferably achieved by delivering an n-bit input digital signal to an n+m bit DAC, and holding the DAC's m most significant bits OFF. The m most significant bits are dummy bits that are impedance matched with the DAC, while the amplifier is an operational amplifier with a feedback circuit that is also impedance matched to the DAC.
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Analog Devices, Inc. Data Converter Reference Manual, vol. 1, 1992, pp. 2-267 through 2-278.
Analog Devices
Hoff Marc S.
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