Circuit arrangement for generating a temperature-compensated voltage or current reference value
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United States of America Patent
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Issued Date -
Aug 21, 2008
app pub date -
Dec 17, 2007
filing date -
Dec 18, 2006
priority date (Note) -
Abandoned
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Abstract
A circuit arrangement for generating a temperature-compensated voltage or current reference value (UREF) from a supply voltage (VCC) based on the bandgap principle comprises a PTAT circuit (201) for generating a PTAT signal (I1) proportional to the absolute temperature, a CTAT circuit (202) for generating a CTAT signal (UBE) inversely proportional to the absolute temperature, whereby for generating the temperature-compensated reference value (UREF), the PTAT signal (UBE) and the CTAT signal (I1) are superimposed, and a reference value monitoring circuit (203a, 203b, 203), which generates a reference value monitoring signal (UREF_OK) that indicates whether the reference value (UREF) is validly generated or not. The reference value monitoring circuit (203) is formed in such a way that it evaluates a current (I2) and/or a voltage in the CTAT circuit (202) and/or in the PTAT circuit (201) for generating the reference value monitoring signal (UREF_OK).
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