A 28-MHz wide-band switched-capacitor bandpass filter with high attenuation

A 28-MHz switched-capacitor (SC) bandpass filter employs an N-path technique and implements transmission zeros in the transfer function to achieve both wide bandwidth and high attenuation. Implemented in a 0.35-mum CMOS process (V-TP = 0.82 V and V-TN = 0.65 V) and with a 3-V supply, the filter measures a center frequency of 28 MHz with a bandwidth of 3.84 MHz and a sampling frequency of 112 MHz. The filter achieves an IIP3 of 20 dBm while dissipating a power of 225 mW corresponding to 19.58 mW per pole and occupying a chip area of 1.65 mm(2)