Title :
High-speed wide-locking range VCO with frequency calibration
Author_Institution :
Yasu Technol. Appllication Lab., IBM Japan, Shiga, Japan
Abstract :
High-speed network systems require a wide-frequency-range clock system for data processing. Frequency calibration method enables the voltage-controlled oscillator (VCO) in a phase-locked loop (PLL) to cover the expected frequency range for high-speed applications that require a wide locking range. Frequency range adjustment is implemented by means of a current DAC, which controls the current of an inverter chain oscillator. The circuit is implemented within small space in a high-speed hard disk drive channel with 0.25-μm four-layer metal CMOS technology
Keywords :
CMOS integrated circuits; calibration; high-speed integrated circuits; mixed analogue-digital integrated circuits; phase locked loops; voltage-controlled oscillators; 0.25 micron; PLL; current DAC; four-layer metal CMOS technology; frequency calibration; hard disk drive channel; high-speed VCO; high-speed applications; inverter chain oscillator; phase-locked loop; wide-frequency-range clock system; wide-locking range VCO; CMOS technology; Calibration; Clocks; Data processing; Frequency; High-speed networks; Inverters; Phase locked loops; Space technology; Voltage-controlled oscillators;
Conference_Titel :
Circuits and Systems, 2000. Proceedings. ISCAS 2000 Geneva. The 2000 IEEE International Symposium on
Conference_Location :
Geneva
Print_ISBN :
0-7803-5482-6
DOI :
10.1109/ISCAS.2000.855992
