Patent ID: 7112948
Filing Date: 2006-09-26
Classification: G05F

Abstract:
1. A voltage source circuit capable of selectively providing temperature independent and temperature dependent output voltages, comprising: an output terminal which provides said voltage source's output voltage V a base-emitter voltage generating circuit, comprising: an amplifier having an output, a non-inverting input and an inverting input, said non-inverting input connected to said second node, said inverting input connected to said first node through an input capacitor having a capacitance C a feedback capacitor having a capacitance C a first switch connected between said amplifier's inverting input and a fourth node; a second switch connected between said third node and said fourth node, said fourth node coupled to the output of said amplifier; a third switch connected between said third node and a circuit common point; and a control circuit arranged to selectively operate said switches and said base-emitter voltage generating circuit to produce a temperature independent output voltage or a temperature dependent output voltage.