Patent ID: 7423480
Filing Date: 2008-09-09
Classification: G01R

Abstract:
1. A front-end circuit for a measurement circuit, the front-end circuit comprising: an input terminal configured to receive input signals; a first amplifier having a pair of differential inputs and an output, wherein the output of the first amplifier is configured to couple to an input of the measurement circuit, and wherein a first one of the pair of differential inputs of the first amplifier is coupled to a reference voltage; a feedback circuit coupled between the second one of the pair of differential inputs of the first amplifier and the output of the first amplifier, and operable to provide at least a 1 a capacitive input circuit having an input coupled to the input terminal of the front-end circuit, and an output coupled to the second one of the pair of differential inputs of the first amplifier, and operable to control a value of a voltage developed at the output of the first amplifier according to the input signals, without requiring compensation for parasitic resistance and/or parasitic capacitance while achieving a fiat frequency response.