Title :
A Wide Locking Range Differential Colpitts Injection Locked Frequency Divider
Author :
Lee, Chien-Feng ; Jang, Sheng-Lyang ; Juang, M.-H.
Author_Institution :
Nat. Taiwan Univ. of Sci. & Technol., Taipei
Abstract :
This letter proposes a new wideband Colpitts injection locked frequency divider (ILFD) and describes the operation principle of the ILFD. The circuit consists of a differential CMOS LC-tank oscillator and a direct injection topology. The divide-by-two ILFD can provide wide locking range, and the measurement results show that at the supply voltage of 2.4 V, the tuning range of the free running ILFD is from 4.46 to 5.6 GHz, about 1.14 GHz, and the locking range of the ILFD is from 8.03 to 11.63 GHz, about 3.6 GHz, at the injection signal power of 0 dBm. The ILFD dissipates 19.92 mW at a supply voltage of 2.4 V and was fabricated in 1P6M 0.18 mum CMOS process. At the tuning voltage of 1.2 V, the measured phase noise of the free running ILFD is -110.8 dBc/Hz at 1 MHz offset frequency from 4.94 GHz and the phase noise of the locked ILFD is -135.4 dBc/Hz, while the input signal power is -4 dBm.
Keywords :
CMOS integrated circuits; MMIC frequency convertors; frequency dividers; injection locked oscillators; differential CMOS LC-tank oscillator; direct injection topology; frequency 1 MHz; frequency 1.14 GHz; frequency 3.6 GHz; frequency 4.46 GHz to 5.6 GHz; frequency 8.03 GHz to 11.63 GHz; power 19.92 mW; size 0.18 mum; voltage 1.2 V; voltage 2.4 V; wideband Colpitts injection locked frequency divider; CMOS; Colpitts $LC$ -tank oscillator; inductors; injection-locked frequency divider (ILFD); wide locking range;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.908055