A 240MHz programmable gain amplifier & filter for ultra low power low-rate UWB receivers

A 90 nm-CMOS power-optimized Programmable Gain Amplifier (PGA) for Ultra Low power Low Rate-Ultra Wide Band (LR-UWB) receivers is illustrated. The PGA features a 0-40 dB programmable gain range with a 5dB gain-step. In addition it implements a 6^th -order 240 MHz Bessel lowpass transfer function. The cut-off frequency is about constant, independently on the different gain settings. At 40 dB gain, the input 1 dBcp is -44.8dBm, and the NF is 14.3 dB. The current consumption (1.9 mA at 0 dB-gain up to 2.9 mA at 40 dB-gain) is optimized by including the opamp performance in the cell transfer function, and accordingly to the selected gain level.