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A Gain/Filtering Interleaved baseband Chain Architectures for multistandard Reconfigurable Receivers

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 are 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÷68 dB, while the input-referred noise density is less 20 nV/√Hz for UMTS and 25 μV/√Hz for WLAN.