Frequency characteristic measuring circuit
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United States of America Patent
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Aug 17, 2010
Grant Date -
Nov 13, 2008
app pub date -
May 8, 2008
filing date -
May 10, 2007
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A frequency characteristic measuring circuit is disclosed, which includes a first diode element having differential input nodes and differential output nodes, thermally coupled to a resistance element of a differential amplifying circuit having the resistance element connected between the differential output nodes, and driven by a first constant current source, a second diode element for reference driven by a second constant current source, and a detection circuit which detects a potential difference between forward voltages of the first and second diode elements to output a signal in accordance with the detected potential difference.
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