Title :
A 400MHz current starved ring oscillator with temperature and supply voltage insensitivity
Author :
Changxing Huo ; Tongsheng Xia ; Hongge Li
Author_Institution :
Sch. of Electron. Inf. Eng., Beihang Univ., Beijing, China
Abstract :
A ring oscillator with temperature and supply voltage compensation is presented in this paper. In the proposed configuration, low drop-out regulator (LDO) is adapted to reject the influence of supply voltage variation on the output frequency of ring oscillator. Temperature sensor and voltage adder/subtractor are used to generate a bias voltage which can maintain a constant output frequency of ring oscillator with temperature variation. In addition, for the purpose of high stability, a high accuracy band-gap reference provides DC bias voltage for LDO, temperature sensor and voltage adder/subtractor. The proposed circuit configuration is realized in 0.35 μm CMOS technology and simulated with cadence tools. The simulation results show the temperature coefficient of output frequency is 57.5 ppm/°C in temperature range of -20 to 100°C and the variation of output frequency with supply voltage is ±0.07% in voltage rang of 3.2 to 4 V.
Keywords :
CMOS integrated circuits; UHF oscillators; adders; compensation; temperature sensors; voltage regulators; CMOS technology; DC bias voltage; current starved ring oscillator; frequency 400 MHz; high accuracy band-gap reference; low drop-out regulator; size 0.35 mum; supply voltage insensitivity; temperature -20 degC to 100 degC; temperature coefficient; temperature compensation; temperature sensor; voltage 3.2 V to 4 V; voltage adder-subtractor; Abstracts; Adders; CMOS integrated circuits; Oscillators; Temperature distribution; Temperature sensors;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2014 12th IEEE International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4799-3296-2
DOI :
10.1109/ICSICT.2014.7021304
