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In this paper a 115μW Programmable Gain Amplifier (PGA) in 90nm CMOS technology is presented. The PGA is embedded in the baseband chain of a low-data-rate UWB PAN receiver. Since a vibration-based energy scavenger powers the receiver, low power consumption is required, while maintaining large dynamic range and wide-band frequency response. Moreover, high input impedance is required from system level constraints and this is achieved with MOS input devices, exploiting dual differential input Opamp. The PGA gain is programmable in the 15dB-to-50dB range with 1dB step. For the maximum gain level (50dB), the Input-Referred-Noise power spectral density is lower than 20nV/√Hz. From a single 1V supply, for the minimum gain level (15dB), a 0.8Vzero-peak output signal is processed with THD=-40dBc.