The utility model provides an autotracking 90 moves looks ware, including the consecutive signal conditioning circuit who connects, digital phase locking frequency doubling circuit and low pass filter circuit signal. The sinusoidal signal of input enlargies through signal conditioning circuit to the plastic becomes the square wave, then the square wave after utilizing digital phaselock technique to the plastic is realized trailing the doubling of frequency, and the doubling of frequency coefficient is 100, signal that last low pass filter circuit used the output of digital phase locking frequency doubling circuit is the clock, carries out low pass filter to incoming signal, and through setting up equitable filter cut -off frequency, combination switched capacitor filter MAX296's frequency -phase characteristic can realize moving looks to incoming signal's autotracking 90.