Delta V.sub.BE generator circuit

DETAILED DESCRIPTION I claim: 1.
A circuit for generating a compensating potential that is small with respect to a V.
sub.
BE potential of an "on" transistor and is linearly proportional to absolute temperature, said circuit comprising: a first branch including first diode means coupled in series with means for developing said compensating potential and first current supply means; a second branch including second diode means coupled in series with second current supply means; said first and second current supply means being operated in conjunction with said first and second diode means to establish a predetermined current density ratio in said first and second diode means with said second diode means operating at a higher current density; means for coupling said first branch to said second branch to force the potential developed across said second diode means to equal the potential developed across the series combination of said first diode means and said means for developing said compensating potential; and amplifier means having an input coupled to said second branch and an output coupled directly to said means for developing said compensating potential, said amplifier means being operated in a negative feedback mode to force said compensating potential to equal the difference in potential between said first and second diode means whereby said predetermined current density ratio is maintained constant.
2.
A circuit for generating a compensating potential that is small with respect to a V.
sub.
BE of an on transistor and is linearly proportional to absolute temperature, said circuit comprising: a first branch including first diode means coupled in series with means for developing said compensating potential and first current supply means, said first current supply operating to develop a current in said first diode means at a first current density; a second branch including second diode means coupled in series with second current supply means, said second current supply means operating to produce a current in said second diode means at a second current density that is higher than said first current density; and differential amplifier means having an output coupled directly to said means for developing said compensating potential and a pair of input terminals each coupled to a respective one of said first and second branches, said amplifier means being operated to maintain the ratio of said first current density to said second current density constant