Design of a low power SC filter with switched-opamp technique

The design of low power switched capacitor biquadratic filter based on switched-opamp(SO) technique is analyzed . By using the character of differential input and differential output circuits, the switched capacitor circuits can be realized with half-delay integrator. So low power SO biquadratic filter can be realized .The emphasis of the paper is the analysis of Fleischer-Laker biquadratic filter. The structures of the biquadratic filter and the Z transfer function are given.