Title :
A current compensated reference oscillator
Author :
Li, Wan-Jing ; Chang, Soon-Jyh ; Lin, Ying-Zu
Author_Institution :
Nat. Cheng-Kung Univ., Tainan, Taiwan
Abstract :
This paper reports a reliable current compensated reference oscillator without any BJT or external component. To maintain a stable oscillation frequency, the discharging current of the proposed architecture varies with process, supply voltage and temperature (PVT) variations. Fabricated in a 0.18-mum digital CMOS process, this oscillator consumes 0.5 mW from a 1.8 V supply. The post-simulation results show the worst case is 12%. From 500 times Monte Carlo simulation results, the frequency variations are all limited within plusmn3%. The measurement result of ten samples at room temperature with 10% supply voltage deviation shows variation within plusmn10%. The maximum variation is -10.19% with process and supply voltage variations from measurement results.
Keywords :
CMOS digital integrated circuits; Monte Carlo methods; integrated circuit reliability; oscillators; reference circuits; Monte Carlo simulation; current-compensated reference oscillator reliability; digital CMOS process; power 0.5 mW; process-and-supply voltage variations; size 0.18 mum; stable oscillation frequency; temperature variations; voltage 1.8 V; CMOS technology; Clocks; Costs; Delay; Frequency; Inverters; Ring oscillators; Temperature; Voltage control; Voltage-controlled oscillators;
Conference_Titel :
VLSI Design, Automation and Test, 2009. VLSI-DAT '09. International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
978-1-4244-2781-9
Electronic_ISBN :
978-1-4244-2782-6
DOI :
10.1109/VDAT.2009.5158112
