Patent ID: 6900689

Claim:
A reference voltage circuit; comprising: first and second emitter-grounded bipolar transistors, each having a base connected to a collector, with each collector being fed with a respective constant current; first and second operational transconductance amplifiers (OTAs), each having at least a first input terminal and a second input terminal and adapted for outputting from an output terminal a current proportional to a differential voltage between voltages applied to said first and second input terminals; and a current mirror circuit having at least an input end and an output end, with the ratio of the current fed to said input end to the current output from the output end being of a predetermined value, wherein the collectors of the first and second bipolar transistors are connected respectively to the first and second input terminals of the first OTA; said output terminal of said first OTA is connected to said input end of said current mirror circuit; the output terminal of said second OTA is directly connected to the first input terminal of the second OTA and said collector of said second bipolar transistor is connected to the second input terminal of said second OTA; and a connection node of said first input terminal and the output terminal of said second OTA is connected to said output end of said current mirror circuit, and said output terminal of said second OTA outputs a reference voltage.