Constant response switching circuit for different frequency signals - has operational amplifier with switches in negative feedback path and voltage divider and amplifier in positive feedback path

摘要

The switching circuit has an operation amplifier (1) with two series-coupled switches (2, 3) in its negative feedback loop and a two-resistor voltage divider in its positive feedback loop. Apart from the two resistors (10, 11) the voltage divider has an operational amplifier (4e whose non-inverting input is connected to an intermediate voltage rail (6, 7) and whose inverting input is connected to the tapping between the two resistors. This second amplifier's output is connected to on end of the two resistors - whose other end leads to the output of the first operational amplifier. The first amplifier's non-inverting input is also connected to the divider's tapping.