A 115µW UWB Programmable Gain Amplifier for intelligent tire personal area network

In this paper the complete design of a Programmable Gain Amplifier embedded in UWB receiver is presented. The receiver is part of a System-On-Chip placed inside the car tire (with the aim to interchange data with the car control unit) where dynamic stress, temperature and aging are very important issues, resulting in severe design constraints for CMOS analog integrated circuits. Furthermore, the SoC is biased by vibration-based energy scavenger, and a as consequence, very low power is available for the integrated circuits. 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/vHz. From a single 1V supply, for the minimum gain level (15dB), a 0.8Vzero-peak output signal is processed with THD=−40dBc.