Jordan and Hamburg LLP
Current control circuit
A current control circuit for maintaining constant current characteristics with respect to power source potential fluctuations has a first resistor with one end connected to a source potential first and second P-channel field effect transistors each having a source connected to the other end of the first resistor and a gate coupled to a gate of the other P-channel FET. The first P-channel FET has a drain directly connected to the mutually coupled gates. A second resistor connects a drain of the second P-channel FET to the mutually coupled gates, and a resistor element connects the mutually coupled gates to a zero potential. A voltage arising at the drain of the second P-channel FET is used as a gate-driving voltage for driving a gate of a current-setting transistor.
Nippon Precision Circuits Inc.
G
G05F
inventional
Shinichi
Watanabe