Reference current generating apparatus

Details Reference current generating apparatus Reference current generating apparatus

2008-06-09

2010-12-14

Berhane, Adolf (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

Using a three or more terminal semiconductive device as the...

C323S281000

Reexamination Certificate

active

07852062

ABSTRACT:
A reference current generating apparatus is provided which is capable of generating a reference current having no temperature dependency, without increasing a layout area. The reference current generating apparatus includes a constant current generating circuit having a differential amplifier, a constant current generating circuit connected to the constant current generating circuit and having a differential amplifier, and an output circuit connected to the constant current generating circuit for outputting first and second reference voltages. The constant current generating circuit generates a reference current by enabling selection of a mirror ratio of a transistor that conducts summing of a constant current proportional to a thermal voltage, and by enabling switching of a dividing voltage from a resistor to an input of the differential amplifier, to generate a constant current proportional to a diode voltage via a high impedance MOS gate.

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Hironori Banba et al., A CMOS Bandgap Reference Circuit with Sub-1-V Operation; IEEE Journal of Solid-State Circuits, vol. 34, No. 5, May 1999.

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