A Novel CSS-UWB Receiver Front-End

This paper presents a chirp spread spectrum receiver operating in the 3–5 GHz UWB for WBAN medical applications. The receiver uses direct conversion architecture without RF bandpass filter. Modeling, design, and simulations of the entire receiver architecture are described. Time domain as well as frequency domain analysis and simulation were done in order to determine optimized blocks parameters of the receiver. The receiver is capable of handling a pulse repetition frequency of 10Mp/s with a pulse width of 20ns and a bandwidth of 500MHz. The receiver provides an output power level between −4.3 and −7dBm which is sufficient to drive the baseband demodulator. A sensitivity of −93.3dBm, a voltage gain of 85 dB an IIP3 of 11.2dBm, and a NF of 6.1 dB are achieved.