Second-order OTA-C filters using a single OTA

A new voltage-mode second-order low pass OTA-C filter is proposed. The filter is integrator-based and uses only one OTA and two grounded capacitors. A multiple-input operational transconductance amplifier (OTA) for the simulation of the proposed filter is also described. The filter has been simulated using a 0.25/spl mu/m CMOS process. The results show that for a cutoff frequency of 50 MHz, the filter dissipates 5.3mW power from a single 2V supply. The dynamic range and RMS noise are 63dB and 91/spl mu/V (up to 100MHz), respectively. Further advantages of the proposed filter are frequency tunability, low sensitivity, low component count and ease of design. A current-mode equivalent of similar features and possibly better performance is also presented.