Title :
High-dynamic-range decibel-linear IF variable-gain amplifier with temperature compensation for WCDMA applications
Author :
Carrara, Francesco ; Filoramo, Pietro ; Palmisano, Giuseppe
Author_Institution :
DIEES, Catania Univ., Italy
Abstract :
This paper presents the design and simulated performance of a novel intermediate-frequency variable-gain amplifier for Wideband Code-Division Multiple Access transmitters. A compensation technique for parasitic coupling is proposed which allows the very high dynamic range of 85 dB to be attained using a single variable-gain stage. Temperature compensation and decibel-linear control are achieved by means of a proper bias network which provides a lower than ±1.5 B gain error over full temperature and gain ranges. The device has a 600 MHz bandwidth and drains up to 5.5 mA from a 2.7-V power supply. A -146-dBm/Hz output noise and -55-dBc adjacent-channel leakage power ratio are obtained under maximum gain conditions. Circuit simulations are based on a 0.8-μm 46-GHz-fT silicon bipolar technology.
Keywords :
bipolar analogue integrated circuits; code division multiple access; compensation; gain control; intermediate-frequency amplifiers; radio transmitters; 0.8 micron; 2.7 V; 5.5 mA; 600 MHz; IF variable-gain amplifier; Si; WCDMA transmitter; adjacent-channel leakage power ratio; bias network; decibel-linear gain control; dynamic range; output noise; parasitic coupling compensation; silicon bipolar technology; temperature compensation; Bandwidth; Broadband amplifiers; Circuit noise; Dynamic range; Error correction; Multiaccess communication; Power supplies; Temperature control; Temperature distribution; Transmitters;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205557
