Reference voltage generating circuit

Details Reference voltage generating circuit Reference voltage generating circuit

G - Physics

05

F

328/179

G05F 1/567 (2006.01) G05F 3/26 (2006.01) G05F 3/30 (2006.01) H04B 1/16 (2006.01)

Patent

CA 1234188

REFERENCE VOLTAGE GENERATING CIRCUIT ABSTRACT OF THE DISCLOSURE A reference voltage generating circuit has a control transistor whose collector-emitter path is connected between the output terminal and an input terminal, first and second resistors connected in series with the collector-emitter path of a current detection transistor between the output terminal and ground with the base of the current detection transistor being connected to a connection point between the first and second resistors, a third transistor whose base-emitter path is connected in parallel to the collector-emitter path of the current detection transistor and which has an emitter periphery area n times an emitter periphery area of the current detection transistor, a fourth transistor of the same conductivity type as the current detection transistor and the base of which is connected to the base of the current detection transistor, and a circuit in which a difference between the collector currents of the third transistor and the fourth transistor is detected and a corresponding signal is negatively fed back to the base of the control transistor for ensuring that a constant reference voltage is provided at the output terminal.

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