DAC current source with stabilizing bias
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United States of America Patent
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Dec 21, 1993
Grant Date -
N/A
app pub date -
May 1, 1991
filing date -
May 1, 1991
priority date (Note) -
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Abstract
In a digital-to-analog converter (DAC) current source including a current mirror, an output transistor biased by a reference voltage and a steering transistor, a structure and a method are provided to implement the DAC current source without current spikes in the output current. Current spikes in the output current are avoided by including a transistor acting as a low-pass filter between the steering transistor and the output transistor. In one embodiment, the DAC current source circuit is implemented by PMOS transistors.
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