Bias generator that automatically adjusts its slew rate
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United States of America Patent
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Sep 5, 2006
Issued Date -
N/A
app pub date -
Mar 16, 2005
filing date -
Dec 20, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A bias generator that automatically adjusts its slew rate is disclosed to generate an output bias current and adjust the output bias current according to the frequency of a clock signal. The slew rate of the amplifier is thus controlled to save power. It includes: a current mirror for receiving a feedback voltage and generating an output bias current; a storage capacitor with a first end and a second end and the latter being coupled to the ground; a charging switch coupled between the output of the current mirror and the first end of the storage capacitor; a discharging switch coupled between the first end of the storage capacitor and the ground; a comparator whose input is coupled to the first end of the storage capacitor and a reference voltage; and a feedback unit coupled to the output of the comparator for outputting a feedback voltage to the current mirror.
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