Parallel Integrated State Variable Filter Circuit Design

Abstract

In this paper, a parallel state variable filter circuit is designed. The integrated operational amplifier is used as the amplifying circuit. The state variable method is used to solve the differential equation to realize the high-pass, low-pass and band-pass band-stop filtering functions of parallel filtering. Through the Cadence software simulation, the state variable filter high-pass circuit cut-off frequency is 32.9KHz, the low-pass circuit cut-off frequency is 1.7KHz, the band-pass circuit center frequency is 7.0KHz, the band-stop circuit center frequency is 7.0KHz. The quality factor of the filter is 0.2, which is significantly better than other designs under the same conditions. Finally, the circuit layout is drawn using Cadence software. In this paper, the circuit simulation, layout drawing and verification are carried out with Virtuso, Spectre and Caliber software integrated in the Cadence system.