Low voltage bipolar amplifier
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United States of America Patent
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Jul 25, 1995
Grant Date -
N/A
app pub date -
Aug 1, 1994
filing date -
Aug 1, 1994
priority date (Note) -
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Abstract
A bipolar transistor amplifier with improved base biasing is disclosed. In the bias circuit of the present invention, the bias current only varies with the log(log) of variations in .beta. of the NPN transistors, making the circuit particularly resistant to temperature and process induced variations in .beta.. A feedback loop also insures that the bias current will remain constant under normal operating conditions. In several embodiments of the present invention, the bias signal and the input signal are kept separate, reducing interference. The amplifier and bias circuit provides a large amount of voltage headroom even with low supply voltages.
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