Title :
A Wideband CMOS Variable Gain Amplifier with a Novel Linear-in-dB Gain Control Structure
Author :
Li, Zhiqun ; Guo, Feng ; Chen, Dongdong ; Li, Haisong ; Wang, Zhigong
Author_Institution :
Southeast Univ., Nanjing
Abstract :
In this paper, a novel structure of linear-in-dB gain control is introduced. Based on this structure, a wideband variable gain amplifier has been designed and implemented in TSMC 0.18-mum RF CMOS process. On-chip measured results show a good linear-in-dB gain control characteristic with 12.8 dB dynamic gain range of -3.3~9.5 dB. It can operate in the frequency range of 43~2330 MHz and consumes 16.2 mW at 1.8 V supply. The noise figure is 6.2 dB at maximum gain and the input P1dB at minimum gain is -9 dBm.
Keywords :
CMOS analogue integrated circuits; UHF amplifiers; VHF amplifiers; wideband amplifiers; RF CMOS process; frequency 430 MHz to 2330 MHz; gain -3.3 dB to 9.5 dB; linear-in-dB gain control; noise figure 6.2 dB; power 16.2 mW; size 0.18 mum; voltage 1.8 V; wideband CMOS variable gain amplifier; Broadband amplifiers; Circuit topology; Control systems; Gain control; Noise figure; Radio frequency; Radiofrequency amplifiers; Signal processing; Voltage control; Wideband; CMOS; VGA; linear-in-dB; wideband;
Conference_Titel :
Radio-Frequency Integration Technology, 2007. RFIT 007. IEEE International Workshop on
Conference_Location :
Rasa Sentosa Resort
Print_ISBN :
978-1-4244-1307-2
Electronic_ISBN :
978-1-4244-1308-9
DOI :
10.1109/RFIT.2007.4443984
