Title :
High-dynamic-range VGA with temperature compensation and linear-in-dB gain control
Author :
Carrara, Francesco ; Palmisano, Giuseppe
Author_Institution :
Dipt. di Ingegneria Elettrica Elettronica e dei Sistemi, Univ. di Catania, Italy
Abstract :
This paper presents the design and measured performance of a novel intermediate-frequency variable-gain amplifier for Wideband Code-Division Multiple Access (WCDMA) transmitters. A compensation technique for parasitic coupling is proposed which allows a high dynamic range of 77 dB to be attained at 400 MHz while using a single variable-gain stage. Temperature compensation and decibel-linear characteristic are achieved by means of a control circuit which provides a lower than ±1.5 dB gain error over full temperature and gain ranges. The device is fabricated in a 0.8-μm 46 GHz fT silicon bipolar technology and drains up to 6 mA from a 2.7-V power supply.
Keywords :
bipolar analogue integrated circuits; code division multiple access; compensation; gain control; integrated circuit design; integrated circuit measurement; radio transmitters; wideband amplifiers; 0.8 micron; 2.7 V; 400 MHz; 46 GHz; VGA; WCDMA transmitters; dynamic range; intermediate frequency variable gain amplifier; linear gain control; temperature compensation; wideband code division multiple access; Broadband amplifiers; Coupling circuits; Dynamic range; Error correction; Gain control; Multiaccess communication; Silicon; Temperature control; Temperature distribution; Transmitters; Linear-in-dB gain control; temperature compensation; variable-gain amplifier (VGA); wideband code-division multiple access (WCDMA);
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2005.852827
