Title :
A 95 dB dynamic range automatic gain control circuits and systems for Multi-standard Digital TV tuner
Author :
Xiaofeng He ; Yuanjin Zheng ; Chengyan Ma ; Tianchun Ye
Author_Institution :
Dept. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore
Abstract :
A 95 dB dynamic range automatic gain control (AGC) circuits and systems for Multi-standard Digital TV (DTV) tuner has been presented. A novel automatic gain control method composed of RFAGC and IFAGC is proposed with improved SNR. A wideband single-ended LNA based on current-reuse technique with low temperature variation is proposed. The complete AGC circuits are fabricated in six-metal 0.18-μm CMOS technology and consume DC current of 32.5 mA from a 1.8 V supply. The RF front-end circuit achieves 90 dB maximum gain, 95 dB gain control range, a 4 dB noise figure and an IIP3 higher than -28 dBm at the maximum gain.
Keywords :
CMOS integrated circuits; automatic gain control; digital television; low noise amplifiers; radiofrequency amplifiers; tuning; AGC circuits; CMOS technology; DTV tuner; IFAGC; IIP3; RF front-end circuit; RFAGC; SNR; current 32.5 mA; current-reuse technique; dynamic range automatic gain control; gain 90 dB; gain 95 dB; low temperature variation; multistandard digital TV tuner; noise figure; size 0.18 mum; voltage 1.8 V; wideband single-ended LNA; Digital TV; Dynamic range; Gain; Gain control; Noise measurement; Radio frequency; Tuners; Automatic gain control circuits; Digital TV tuner; RF programmable amplifier (RFPGA);
Conference_Titel :
Circuits and Systems (ISCAS), 2014 IEEE International Symposium on
Conference_Location :
Melbourne VIC
Print_ISBN :
978-1-4799-3431-7
DOI :
10.1109/ISCAS.2014.6865676
