Absolute value circuit
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United States of America Patent
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Apr 20, 2004
Grant Date -
N/A
app pub date -
Mar 4, 2003
filing date -
Mar 4, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An absolute value circuit includes an operational amplifier, the output of which is coupled to control inputs of complementary polarity transistors having current flow paths therethrough coupled in series with inputs of current mirror amplifier stages. A common node of the current flow paths through the transistors is coupled to an input of the operational amplifier to which a current waveform is applied. The current mirror amplifier stages are configured so as to provide like polarity output currents. The outputs of the current mirror amplifier stages are combined to produce an output current that corresponds to a full wave rectification or absolute value of an input current coupled to the operational amplifier.
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