Design and implementation of ultra-wide-band CMOS LC ilter LNA 215 Design and implementation of ultra-wide-band CMOS LC ilter LNA

Demand for low cost and high data-rate wireless communication systems is increasing. Since the FCC has authorized communication in the 3.1 GHz to 10.6 GHz frequency band, several technologies have been developed to satisfy the communication market. Typically, Orthogonal Frequency Division Multiplexing (OFDM) technique appears to be good candidate for high speed data communication whereas carrier less Impulse Radio (IR-UWB) is a good solution for low cost systems or positioning systems. The allocated frequency bands for UWB are 3.1–10.6 GHz in North America, 6–8.5 GHz in Europe, and 3.4–4.8 GHz, 7.25–10.25 GHz in Japan. In integrated UWB systems the LNA must provides a high voltage gain on a high impedance output load given by a digitizer or a pulse detector in Impulse Radio UWB architectures, or by a mixer in OFDM architectures. So the LNA is one of the most important analog bloc of the receiver. To achieve low cost the LNA must be fully integrated and must consume low power and low die area. Ideally the LNA must be broadband matched to a 50 antenna, and must provide a high voltage gain on a high impedance value capacitive output load. In addition a constant group delay is required in the signal bandwidth to maintain the signal integrity of the pulsed wideband signal.