Patent ID: 7368987

Claim:
A circuit configuration having a circuit input for an input signal (Vin) to be amplified and a circuit output to output the amplified input signal as an output signal (Vout), the circuit configuration comprising an operational amplifier (AMP), whose amplifier input is impinged by the input signal (Vin) to be amplified and at whose amplifier output the amplified input signal (Vout) is provided, the operational amplifier (AMP) being fed back using a feedback network ( 12 , 14 ) to define the circuit amplification, and the feedback network ( 12 , 14 ) comprising a coupling path ( 12 ), which is situated between a circuit input terminal and an inverting amplifier input terminal, and a feedback path ( 14 ), which is situated between an amplifier output terminal and the inverting amplifier input terminal, characterized in that the coupling path ( 12 ) comprises a coupling capacitor having a changeable capacitance value, referred to in the following as Cb, and the feedback path ( 14 ) comprises a feedback capacitor having a changeable capacitance value, referred to in the following as C, adjustment means being provided for simultaneously changing the two capacitance values Cb and C, so that the following relationship applies: Cb=k a ( N+b x ) Cu and C =( c N−d x ) Cu, k, a, b, c, and d identifying permanently predefined parameters, Cu identifying a permanently predefined capacitance value, N identifying a predefined natural number, and x identifying a natural number which may be changed in a range from 0 through N during the change.