Digital self-tuning technique for continuous-time filters

In this paper, a new auto-tuning digital technique is reported for continuous-time filters over VHF (very high frequency) applications, based on phase detector. By using a 0.35 μm Mixed Signal CMOS process, changes in frequency response of a 3rd-order low pass filter can be tuned with a 3% error over the designed value. This technique confirms the feasibility of the proposed scheme in continuous-time filter applications. The system consumes less area, power and tuning time than other proposed schemes. Simulated results show the building viability in a 10 MHz low pass filter.