Active filter circuit with bi-quadratic transfer function - has operational amplifier with specified RC input and feedback circuits

摘要

The filter circuit has an operational amplifier (4) connected by its output to the circuit's output (3), by its non-inverting input to the shared input/output rail (1) and by its inverting input via a first resistor (GO) to the circuit's input (2). The inverting input is also connected via a third resistor (G2) to the amplifier's output and via two series capacitors (C2, c3) to the circuit's input. The junction between the capacitors is connected via another capacitor (1) - shunted by a first resistor (G1) - to the output of the amplifier.