Low voltage bandgap reference circuit
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United States of America Patent
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Apr 28, 2015
Grant Date -
Jun 26, 2014
app pub date -
Mar 20, 2013
filing date -
Dec 20, 2012
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Abstract
A low voltage bandgap reference circuit includes a positive temperature coefficient circuit unit, a negative temperature coefficient circuit unit and a load unit, wherein the positive temperature coefficient circuit unit comprises a first differential operational amplifier, a first, second and third transistor, a first resistor, a first and second diode, and the negative temperature coefficient circuit unit includes a second differential operational amplifier, a fourth, fifth and sixth transistor, a second resistor and a third diode. The low voltage bandgap reference circuit provides a current having a positive temperature coefficient characteristics and a current having a negative temperature coefficient characteristics to flow through the load in order to generate a stable reference voltage less affected by the temperature. Therefore, it avoids the problems of the low voltage bandgap reference circuit that can not be activated at low voltage.
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