Digitally programmable CMOS current-conveyor circuit for filter design

This paper presents a new topology for a fully digitally programmable current-mode filter. The proposed scheme is based on the current conveyor cell in. The circuit is preferred for low power low voltage applications since it is based on CMOS inverters and op-amps only. The proposed circuit is employed to implement digitally variable capacitor for low cut off frequency filter design. The proposed circuits have been designed and simulated using the IBM CMOS 0.13 mum process. Error analysis is also provided in detail and performance improvement is discussed. Simulation results show good agreement with the analytical calculations. The static power dissipation is equal to 0.1 mW from 1.5 V supply.