Single-amplifier integrator-based low power CMOS filter for video frequency applications

This paper describes a new low power l l l y differential secondorder continuous-time low pass filter for use at video frequencies. The filter uses a single active device in combination with MOSFET resistors and grounded capacitors to achieve very low power consumption, small chip area and large dynamic range. The ideal integrator is realised using an internally compensated opamp consisting of only current mirrors and voltage buffers, whilst the lossy integrator is implemented by a single passive RC circuit. The filter has been simulated using a CMOS process. Results show that with a single 5V power supply, cut-off frequency can be tuned from 3.5MHz to SMHz, dynamic range is better than 67dB, and power consumption is less than 1.7mW.