Patent ID: 9077301
Filing Date: 2015-07-07
Classification: H03F

Abstract:
1. A circuit, comprising: an operational amplifier (op-amp) having a first input (+), a second input (−), and an output having an output voltage V a first resistor R a second resistor R a first switch having a first position in which the first input (+) of the op-amp is electrically coupled to a first input source (Hi) and a second position in which the second input (−) of the op-amp is electrically coupled to the first input source (Hi); a second switch having a first position in which the output of the op-amp is electrically coupled to the second input (−) of the op-amp and a second position in which the output of the op-amp is electrically coupled to a second input source (Lo); and a third switch having a first position in which the second input source (Lo) is electrically coupled to the second end of the first resistor and a second position in which the first input source (Hi) is electrically coupled to the second end of the first resistor, wherein there is an input voltage V