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CMOS dual-band variable-gain amplifier for 3G-WCDMA and WLAN dual-mode RF receivers

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3 Author(s)
Chang, S.-F. ; Dept. of Electr. Eng., Nat. Chung Cheng Univ., Taiwan ; Chen, W.-L. ; Hsu, C.-H.

A dual-band variable-gain amplifier (DBVGA) is presented for integrated 2.2 GHz 3G-WCDMA and 5.2 GHz WLAN transceivers. DBVGA employs a DC-and-RF current steering technique for gain control, which can minimise variations of the noise, 1 dB gain compression point, and input/output impedance when the gain is tuned. The appropriate frequency operation band of DBVGA is jointly controlled by the switched-resonator load and the input stage gate bias, resulting in high cross-band isolation and out-of-band interference rejection. All circuits except the input stages are reused for both bands to have high component reuse. A fully-integrated 0.18 mum CMOS DBVGA has been implemented to verify the proposed design

Published in:

Electronics Letters  (Volume:43 ,  Issue: 2 )