Reference current circuit

Details Reference current circuit Reference current circuit

2008-03-26

2010-12-07

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Self-regulating

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

Reexamination Certificate

active

07847534

ABSTRACT:
Provided is a reference current circuit able to reduce temperature dependence of the reference current even in a case of using a resistor with extremely low temperature-dependent resistance. The reference current circuit comprises a non-inverting amplifier circuit110receiving a temperature-compensated reference voltage VBGand generating a voltage Vout1at an output point; a current source circuit120composed of a transistor Q1connected to the output point via a resistor and a transistor Q2receiving a voltage equal to a voltage VBE1generated across terminals of Q1and generating a corresponding current. The circuit110(i) includes a third transistor Q3, a voltage VBE3generated across terminals of which has the same temperature characteristic as the voltage VBE1, and (ii) is configured such that Vout1is a sum of (a) a temperature-compensated voltage component based on VBGand (b) a voltage component equal-to-the voltage VBE3.

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Watanabe, Kajiro, et al., “Fundamentals of Analogue LSI Design,” Ohmsha, 2006, pp. 149-215, with verification from translator Yukiko Hirama.

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