A 3.2GHz-sample-rate 800mHz bandwidth highly reconfigurable analog FIR filter in 45nm CMOS

A 16-tap analog FIR filter with 3.2 GHz-clock achieves fully reconfigurable transfer functions over an 800 MHz range. Time domain convolution is realized by switching programmable transconductance values and exploiting a current integration technique to merge sampling, summing and anti-aliasing functions. The circuit draws 65 mW from a 1.1 V supply and occupies 0.15 mm² in 45 nm CMOS.