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An interface circuit between a sensor and a signal conditioning circuit

 

An interface circuit to provide for a pair of differential output signals is provided  by receiving differential input signals, the input signals representable as Vin1 and Vin2, having a common mode signal component Vcm and a differential mode component Vid. The interface circuit comprises of  a first filter circuit receiving the input signal  Vin1 and presenting a first output at a first node; and a second filter circuit receiving the input signal Vin2 and presenting a second output at a second node; and an impedance circuit comprising of both active and passive elements to selectively provide a high impedance to the common mode signal component between the first node and a common ground terminal, and between the second node and the common ground terminal and to generate the differential output signals.

Indian patent application no. 2384/MUM/2010

Inventors: Maryam Shojaei Baghini & Anvesha A