Title :
Full range voltage-controlled ring oscillator in 0.18μm CMOS for low-voltage operation
Author :
Tiao, Y.-S. ; Sheu, Meng-Lieh
Author_Institution :
Dept. of Electr. Eng., Nat. Chi Nan Univ., Nantou, Taiwan
Abstract :
A new differential delay cell with a complementary current control to increase the control voltage range as well as the operation frequency is proposed for low-voltage operation. The new differential delay cell is employed in a four-stage voltage-controlled ring oscillator (VCRO). The VCRO is implemented using 0.18 m 1P6M CMOS process and 1.8 V supply voltage. Measured results show that a wide operation frequency range from 5.36 to 3.03 GHz is achieved for the full range control voltage from 0 to 1.8 V. Measured phase noise is 107 dBc/Hz at 1 MHz offset from the 5.22 GHz centre frequency.
Keywords :
CMOS integrated circuits; delay circuits; electric current control; field effect MMIC; frequency control; low-power electronics; phase noise; voltage-controlled oscillators; CMOS process; VCRO; complementary current control; differential delay cell; four-stage voltage-controlled ring oscillator; frequency 5.36 GHz to 3.03 GHz; low-voltage operation; operation frequency; phase noise; size 0.18 mum; voltage 0 V to 1.8 V;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2010.2542
