IFLF wavelet filters design based on switched-current bilinear integrators
Yigang He · Journal of Circuits and Systems · 2013
According to the theory of continuous-time filter design,a new sampled-data wavelet filter implementation based on switched-current bilinear integrator and inverse follow-the-leader feedback(IFLF) structure is presented.First,the wavelet frequency domain function is approximated by Maclaurin series.Next,the wavelet filter whose impulse response is the wavelet approximation function is designed using an IFLF structure with switched-current bilinear integrator as the main building blocks.By controlling the various clock frequencies of the filters with the same system architecture,the continuous wavelet transform can be implemented.Simulations demonstrate that the designed circuits have simple structure,easily adjustment scales of wavelet function and very low passband sensitivity.