Circuits for generating a current which is proportional to absolute temperature
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United States of America Patent
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Aug 18, 1998
Grant Date -
N/A
app pub date -
Jun 19, 1996
filing date -
Oct 31, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A current reference cell is used to generate stable currents using a voltage reference source such as a band gap reference voltage in order that the output current I.sub.out can be proportional to absolute temperature, making the reference cell suitable for providing the bias current of a bipolar transistor in order that dynamic changes of collector current will be proportional to corresponding changes of base emitter voltage irrespective of temperature. The invention is concerned with rapidly turning off such a current I.sub.out, and a switch such as transistor Q7 is provided which is put into saturation when the reference voltage and hence reference cell are turned off, in order that current decaying via any large capacitor such as C1 connected to the output of the reference cell is diverted through such a switch rather than through the reference cell.
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