Patent ID: 8947067
Filing Date: 2015-02-03
Classification: G05F

Abstract:
1. A circuit comprising: a first circuit part comprising op-amp, a first resistor, and first and second p-n junctions, and configured to produce a voltage across the first resistor substantially equal to a difference between a voltage of the first p-n junction and a voltage of the second p-n junction; a second circuit part comprising a series connection of a current source, a second resistor, and a third p-n junction; a control signal from the first circuit part coupled to the current source in the second circuit part to generate a current flow in the second circuit part that is substantially equal to a current flowing through the first resistor; an output terminal configured to output a voltage level substantially equal to a voltage across the second resistor and a voltage across the third p-n junction; and a calibration circuit comprising: