Patent ID: 7911236
Filing Date: 2011-03-22
Classification: G01R,H03G

Abstract:
1. A detection circuit, comprising: a detector input configured to receive a time varying detection signal; a detector output; a capacitive output element coupled to the detector output; a bias circuit comprising a first bias output configured to provide a first bias voltage and a second bias output configured to provide a second bias voltage; a transistor having a control terminal coupled to the detector input and a first terminal configured to be coupled to a supply voltage, wherein the control terminal is coupled to the first bias output and configured to receive a first intermediate signal as a function of the first bias voltage and the detection signal; a coupling capacitance element coupled between the control terminal and the first terminal of the transistor, and configured to pass the time varying detection signal from the detector input to the first terminal and concurrently block a DC voltage from passing therethrough, thereby operating as a high pass filter; a rectifying element comprising a first terminal coupled to a second terminal of the transistor and to the second bias output, and a second terminal coupled to the capacitive output element.