Title :
A single-stage variable-gain amplifier with 70-dB dynamic range for CDMA2000 transmit applications
Author :
Aggarwal, Sudhir ; Khosrowbeygi, Abolfazl Saeed ; Daanen, Anton
Author_Institution :
Philips Semicond., San Jose, CA, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
A variable-gain amplifier (VGA) circuit is presented with a gain range of more than 70 dB in a single stage. Vertical stacking of multipliers in a single-stage VGA results in a considerable saving of power, which is a prime requirement in cellular systems. The gain-in-dB is a linear function of the control voltage and has excellent stability over temperature. The amplifier is a part of a code-division multiple access cellular transmit integrated circuit, and provides good linearity and noise characteristics over a wide range of IF frequencies. The circuit is fabricated in a 30-GHz ft BiCMOS technology and consumes 8 mA at 2.7 V.
Keywords :
3G mobile communication; BiCMOS analogue integrated circuits; cellular radio; code division multiple access; gain control; intermediate-frequency amplifiers; radio transmitters; 100 to 500 MHz; 1850 to 1910 MHz; 2.7 V; 30 GHz; 70 dB; 8 mA; 824 to 849 MHz; BiCMOS technology; CDMA cellular transmit IC; CDMA2000 transmit applications; IF VGA circuit; cellular systems; code-division multiple access; linearity characteristics; noise characteristics; single-stage variable-gain amplifier; vertically stacked multipliers; BiCMOS integrated circuits; Circuit stability; Dynamic range; Frequency; Integrated circuit noise; Linearity; Multiaccess communication; Stacking; Temperature control; Voltage control;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2003.811868
