Digital-to-analog converter with temperature compensation
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United States of America Patent
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Jul 15, 2003
Grant Date -
N/A
app pub date -
Apr 15, 2002
filing date -
Apr 15, 2002
priority date (Note) -
Expired
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Abstract
A PWM DAC including an emitter follower buffer circuit provides increased accuracy and reduced cost. The emitter follower buffer circuit that enables inexpensive implementation of the PWM DAC. A temperature compensation circuit adjusts the digital input value applied to the PWM to compensate for temperature-induced variation introduced by the emitter follower buffer circuit. The compensation circuit may incorporate circuitry that replicates the PWM DAC at least in part, and monitors the base-emitter voltage of a replicated emitter follower buffer to track temperature-induced variation in the PWM DAC. The compensation circuit generates an error value that can be used to compensate one or more PWM DACs within a particular system.
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