Advances on analog filters for telecommunications

The wireless networks popularity rapidly requires a significant effort on low-power, low-cost, and highly integrated RF ICs, where the power consumption reduction of the transceiver and of each block becomes of fumdamental importance. Analog base-band continuous-time filters embedded in the receiver path are here addressed with three examples. The first example is an Active-Gm-RC filter which uses the opamp frequency response to synthesize the filter behaviour. The second example is a source-follower-based filter cell. A large linearity is achieved for a low over-drive. This with the possibility of realizing a full biquadratic cell in a single branch, requires a low power consumption. Both these examples are suited for UMTS & WLAN receivers. The last example is the gm-gm-C approach which features low-power wide-band CMOS continuous-time low-pass filters with medium resolution, as it is the case of a UWB base-band filter. © 2006 IEEE.