Title :
A 80~900MHz CMOS VCO with Tunable AAC Circuit
Author :
Song, Yingying ; Sun, Wen ; Wu, Jianhui
Author_Institution :
Nat. ASIC Syst. Eng. Res. Center, Southeast Univ., Nanjing
Abstract :
This paper presents an 80~900MHz LC VCO which is implemented in 0.25-mum CMOS technology. The oscillator adopts a multi-VCO structure and an off-chip LC tank. In addition, a charge-pump automatic amplitude control circuit (AAC) is used to ensure a reliable startup and stable working status without degrading the phase noise performance. And the AAC circuit can be tuned to achieve optimized phase noise performance for different frequency bands. Measurement results show that the phase noise achieves -85dBz/Hz at 10 kHz offset frequency
Keywords :
CMOS integrated circuits; circuit tuning; phase noise; voltage-controlled oscillators; 0.25 micron; CMOS VCO; LC tank; charge-pump automatic amplitude control circuit; phase noise performance; tunable AAC circuit; Automatic control; CMOS technology; Charge pumps; Degradation; Frequency measurement; Noise measurement; Phase noise; Tunable circuits and devices; Tuned circuits; Voltage-controlled oscillators;
Conference_Titel :
Solid-State and Integrated Circuit Technology, 2006. ICSICT '06. 8th International Conference on
Conference_Location :
Shanghai
Print_ISBN :
1-4244-0160-7
Electronic_ISBN :
1-4244-0161-5
DOI :
10.1109/ICSICT.2006.306326
