Title :
A wideband CMOS variable gain low noise amplifier based on single-to-differential stage for TV tuner applications
Author :
Han, Kefeng ; Zou, Liang ; Liao, Youchun ; Hao Min ; Tang, Zhangwen
Author_Institution :
ASIC & Syst. State Key Lab., Fudan Univ., Shanghai
Abstract :
A wideband CMOS variable gain low noise amplifier (VGLNA) used for TV tuner is presented. A single-to-differential (S2D) circuit other than an off-chip balun is applied for high gain mode and a resistive attenuator is for five steps (6 dB per step) attenuation in low gain mode. The performance of S2D, especially the noise factor is analyzed. The chip is implemented in a 0.18-mum 1P6M mixed-signal CMOS process. Measurements show that in the 50-860 MHz frequency range, the VGLNA achieves 15 dB maximum gain, 31 dB variable gain range, a minimum 3.8 dB noise figure and 2.6 dBm 11P3 at 15 dB gain while consumes 5.7 mA from a 1.8 V supply.
Keywords :
CMOS analogue integrated circuits; attenuators; low noise amplifiers; television applications; wideband amplifiers; TV tuner applications; current 5.7 mA; frequency 50 MHz to 860 MHz; gain 15 dB; noise factor; noise figure 3.8 dB; off-chip balun; single-to-differential stage; voltage 1.8 V; wideband CMOS variable gain low noise amplifier; Attenuation; Attenuators; Broadband amplifiers; Circuit noise; Gain; Impedance matching; Low-noise amplifiers; Performance analysis; TV; Tuners; Attenuator; Balun; LNA; S2D; Tuner; Wideband;
Conference_Titel :
Solid-State Circuits Conference, 2008. A-SSCC '08. IEEE Asian
Conference_Location :
Fukuoka
Print_ISBN :
978-1-4244-2604-1
Electronic_ISBN :
978-1-4244-2605-8
DOI :
10.1109/ASSCC.2008.4708826
