Title :
A 2–6.5 GHz CMOS variable gain amplifier for vector-sum phase shifters
Author :
Hu Zijie ; Mouthaan, K.
Author_Institution :
Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore, Singapore, Singapore
Abstract :
A wideband CMOS variable gain amplifier (VGA) for application in vector-sum phase shifters is presented. The VGA exhibits a continous, linear-in-magnitude gain control curve by using a programmable transconductance multiplier. Wideband input matching is achieved by employing the common-gate configuration at the input stage. To improve the gain flatness and the output matching, a modified three-stage Cherry-Hooper amplifier with inductive peaking is proposed. Using a standard 0.13-μm CMOS process, the measured 3-dB bandwidth is from 2 to 6.5 GHz with a linear-in-magnitude gain tuning range of 14 dB, and transmission phase error less than 4°. Operating at 1.2 V, the chip consumes 6 mW and occupies 0.6 mm2 including test pads.
Keywords :
CMOS analogue integrated circuits; multiplying circuits; phase shifters; wideband amplifiers; CMOS process; VGA; common-gate configuration; continous linear-in-magnitude gain control curve; frequency 2 GHz to 6.5 GHz; gain flatness; inductive peaking; linear-in-magnitude gain tuning range; output matching; power 6 mW; programmable transconductance multiplier; size 0.13 mum; three-stage Cherry-Hooper amplifier; transmission phase error; vector-sum phase shifter; voltage 1.2 V; wideband CMOS variable gain amplifier; wideband input matching; CMOS integrated circuits; Gain; Impedance matching; Phase shifters; Transconductance; Transistors; Voltage control; CMOS wideband variable gain amplifier; linear-in-magnitude; vector-sum phase shifters;
Conference_Titel :
Microwave Conference Proceedings (APMC), 2012 Asia-Pacific
Conference_Location :
Kaohsiung
Print_ISBN :
978-1-4577-1330-9
Electronic_ISBN :
978-1-4577-1331-6
DOI :
10.1109/APMC.2012.6421509
