Current-mode Gm-C bandpass filter for wavelet transform implementation

This paper presents a method of designing wavelet filters for high-frequency real-time applications, in which the Gm-C technique and current-mode follow-the-leader multiple loop feedback structure are employed. The Marr wavelet is utilized as an example to elaborate the design procedure. Using TSMC 0.18µm CMOS process, the center frequency of the Marr wavelet filter can be tuned from 61.1MHz to 127MHz. The total power consumption at 100MHz is 60mW. Simulation results indicate that the proposed approach is feasible for high-quality high-frequency operation.