Load current compesating output buffer feedback, pass, and sense circuits
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United States of America Patent
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Sep 29, 2015
Grant Date -
Oct 18, 2012
app pub date -
Apr 13, 2011
filing date -
Apr 13, 2011
priority date (Note) -
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Abstract
A load current compensating output buffer circuit and method are disclosed. The circuit includes a buffer amplifier coupled to a supply voltage and the inverting input receives an input voltage and the non-inverting input couples to an output capacitive load. A feedback impedance with a variable resistance circuit and a Miller capacitance in series is coupled to an output of the buffer amplifier and the capacitive load. A pass transistor couples to the supply voltage and the output capacitive load, the pass transistor having a gate terminal coupled to the output of the output buffer amplifier and the feedback impedance, a load current passing through the pass transistor. A sense circuit is configured to sense the load current and apply a control voltage to the variable resistance circuit to vary the resistance of the variable resistance circuit based on the load current.
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