Patent ID: 7161419

Claim:
An amplification device for a detection signal provided by a sensor element comprising: a first operational amplifier having a first amplifier first input, a first amplifier second input, and a first amplifier output; a first switching element connected to said first amplifier first input, an input path for said detection signal, and a reference potential, said first switching element being configured to alternately set said first amplifier first input to a potential of said detection signal and said reference potential; a capacitor having a first capacitor terminal connected to said first amplifier output and a second capacitor terminal providing an output signal; a second switching element connected between said reference potential and said second capacitor terminal; and a control circuit controlling said first switching element and said second switching element to sequence through a first, second and third switch configuration wherein: said first switch configuration has said first switching element setting said first amplifier first input to said reference potential, and has said second switching element connecting said second capacitor terminal with said reference potential; said second switch configuration has said first switching element setting said first amplifier first input to said reference potential, and has said second switching element in an open state disconnecting said second capacitor terminal from said reference potential; said third switch configuration has said first switching element setting said first amplifier first input to said potential of said detection signal, and has said second switching element in said open state disconnecting said second capacitor terminal from said reference potential.