Patent ID: 6362684
Filing Date: 2002-03-26
Classification: H03G

Abstract:
A circuit, comprising:an operational amplifier having first and second inputs and first and second outputs; first and second resistor networks; and first and second switching networks, with said first switching network connected between said first resistor network and said first input and said second switching network being connected between said second resistor network and said second input, wherein said first and second resistor networks each includes a feedback resistor and an input resistor, with said input resistor including a primary input resistor and a plurality of input adjustment resistors connected in series with said primary input resistor, with the input resistors of said first resistor network being coupled to said first input and the input resistor of said second resistor network being coupled to said second input and the feedback resistor of said first resistor network being coupled between said first output and said first input, and the feedback resistor of said second resistor network being coupled between said second output and said second input.