Reference voltage generation circuit, oscillation circuit including the same and method for calibrating oscillation frequency of oscillation circuit
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United States of America Patent
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Aug 18, 2015
Grant Date -
Jul 11, 2013
app pub date -
Nov 30, 2012
filing date -
Jan 11, 2012
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Abstract
A reference voltage generation circuit has: a first PN junction element; a second PN junction element having a higher forward direction voltage than the first PN junction element; a first differential amplifier inputting an anode of the first PN junction element and a first connection node between a first and a second resistor disposed in series between a first output of the first differential amplifier and a first potential, and generating a first output voltage at the first output; and a second differential amplifier inputting an anode of the second PN junction element and a second connection node between a fourth and a third resistor disposed in series between a second output of the second differential amplifier and the first output of the first differential amplifier, and generating a reference voltage at the second output. A resistance ratio between the third and the fourth resistors is variable.
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