A GAIN/FILTERING INTERLEAVED BASEBAND CHAIN ARCHITECTURES FOR MULTISTANDARD RECONFIGURABLE RECEIVERS

摘要

In this paper, four baseband chain architectures used in multistandard (UMTS-WLAN) reconfigurable receivers will be introduced, simulated and, compared. The architectures are realized using 0.25 μm CMOS technology operating with 1.2 V supply voltage. The baseband chain consists of three stages: the first and the last stage arc programmable gain amplifiers and the intermediate stage is an active Gm-RC LPF filter. The proposed architectures are compared in terms of DC-gain, noise, linearity, SFDR, and power consumption. The best receiver architecture is then derived based on system level analysis and based on a defined figure-of-merit. The best baseband chain bandwidth is controlled by the active Gm-RC filter with a value 2.2 MHz for UMTS and 11 MHz for WLAN. The baseband gain can be programmed in the range of -6÷68dB, while the input-referred noise density is less 20nV/√Hz for UMTS and 25μV/√Hz for WLAN.