New equal-valued earthed-capacitor notch network using d.v.c.c.s./d.v.c.v.s.

Using the differential voltage-controlled current/differential voltage-controlled voltage source (d.v.c.c.s./d.v.c.v.s.) as the active element, a new active RC notch network is described. The network has two equal-valued earthed capacitors and the pole Q can be adjusted by single resistive control independent of the realisability condition.