Patent ID: 6788100
Filing Date: 2004-09-07
Classification: G05F

Abstract:
A resistor mirror for providing a resistance in proportion to that of a reference resistor, comprising:first and second power supply terminals; first, second, and third resistor control output terminals; a feedback node; a reference voltage-controlled resistor circuit coupled between the second power supply terminal and the feedback node and having first, second, and third control terminals respectively coupled to the first, second, and third resistor control output terminals; a second voltage-controlled resistor circuit coupled between the second power supply terminal and a resistor mirror output terminal and having first, second, and third control terminals respectively coupled to the first, second, and third resistor control output terminals; a feedback control circuit coupled to the first and second power supply terminals, and having first, second, and third control output terminals respectively coupled to the first, second, and third resistor control output terminals, a reference voltage input terminal, and a control input terminal coupled to the feedback node; a first offset control circuit, having an output terminal coupled to the first resistor control output terminal, a first input terminal coupled to the first power supply terminal, and a second input terminal coupled to the second resistor control output terminal; a second offset control circuit, having an output terminal coupled to the second resistor control output terminal, a first input terminal coupled to the first resistor control output terminal, and a second input terminal coupled to the third resistor control output terminal; and a third offset control circuit, having an output terminal coupled to the third resistor control output terminal, a first input terminal coupled to the second resistor control output terminal, and a second input terminal coupled to the second power supply terminal.