Title :
A novel ring-oscillator with a very small process and temperature variation
Author :
Routama, Jarkko ; Koli, Kimmo ; Halonen, Kari
Author_Institution :
Electron. Circuit Design Lab., Helsinki Univ. of Technol., Espoo, Finland
Abstract :
This paper describes a new ring-oscillator circuit, the conversion gain of which has only a 92% variation with all process variations over the temperature range of 0° to 100°C. The operating range of the oscillator is 180 to 380 MHz. The circuit uses a 3-stage ring-oscillator for low speed conditions and a 4-stage oscillator for high speed conditions. The division between low and fast conditions is based on the transconductance of the MOS-transistors. The oscillator has also a process and temperature dependent control current. The circuit has been designed with a standard 0.5 μm CMOS-process
Keywords :
CMOS integrated circuits; VHF oscillators; circuit tuning; voltage-controlled oscillators; 0 to 100 C; 0.5 micron; 180 to 380 MHz; 3-stage configuration; 4-stage configuration; conversion gain; high speed conditions; low speed conditions; process dependent control current; process variation; ring oscillator; standard CMOS process; temperature dependent control current; temperature variation; transconductance; Circuit optimization; Circuit topology; Phase locked loops; Resistors; Ring oscillators; Temperature control; Temperature dependence; Temperature distribution; Transconductance; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704240
