| 摘要 |
The use of two operational amplifiers provides processing without influence from DC perturbation components present on input signals.- DETAILED DESCRIPTION - The circuit includes two inputs receiving two input voltages (V11, V12) whose difference represents an input analogue signal. Two identical operational amplifiers (A1, A2) provide output voltages (VO1, VO2) such that their difference represents an analogue output signal. Identical passive couplings (C1, C2, R5, R6) are provided to link one of the circuit inputs to one input of each of the amplifiers. Identical feedback resistors (RFB) are connected between a feedback input and an amplifier output, whilst a floating resistance (RDIF) is connected between the feedback inputs of the two amplifiers
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