Title :
A digital-trim controlled on-chip RC oscillator
Author :
Yu, Shuhuan ; Chen, Yiming ; Guo, Weidong ; Che, Xiaoqin ; Smith, Kent F. ; Kim, Yong-Bin
Author_Institution :
Dept. of Electr. Eng., Utah Univ., Salt Lake City, UT, USA
Abstract :
In this paper, a high-accuracy RC Oscillator (OSC) circuit is demonstrated using trimming control. The OSC uses a 7-bit binary-weighted resistor array as the trimming object. Using a 0.5 μm CMOS process, the final output frequency can be achieved within 0.5% error while the original OSC without trimming has as much as 40% output variation due to process variations. Temperature variation and power supply variation are also considered and resolved. Detailed circuit design and SPICE simulation results are presented. The final die size of the test chip is 130 μm x 145 μm excluding bonding pad
Keywords :
CMOS analogue integrated circuits; RC circuits; SPICE; oscillators; 0.5 micron; 7 bit; CMOS chip; RC oscillator; SPICE simulation; binary-weighted trimming resistor array; circuit design; digital trim control; power supply variation; process variation; temperature variation; CMOS process; Circuit synthesis; Digital control; Frequency; Oscillators; Power supplies; Radio control; Resistors; SPICE; Temperature;
Conference_Titel :
Circuits and Systems, 2001. MWSCAS 2001. Proceedings of the 44th IEEE 2001 Midwest Symposium on
Conference_Location :
Dayton, OH
Print_ISBN :
0-7803-7150-X
DOI :
10.1109/MWSCAS.2001.986328
