Title :
Analysis and Design of Wideband Injection-Locked Ring Oscillators With Multiple-Input Injection
Author :
Chien, Jun-Chau ; Lu, Liang-Hung
Author_Institution :
Nat. Taiwan Univ., Taipei
Abstract :
In this paper, the locking range of the injection-locked ring oscillators is investigated. To improve the injection efficiency and the locking range for superharmonic frequency division, a multiple-injection technique is proposed. Using a 0.18-mum CMOS process, a wideband frequency divider based on a three-stage ring oscillator is implemented for demonstration. With a tunable free-running frequency, the fabricated circuit provides 2:1 and 4:1 frequency division with a single-ended input signal ranging from 13 to 25 and 30 to 45 GHz, respectively. Compared with the case of the single-ended injection, the locking range of the frequency divider almost doubles when multiple-input injection with optimum phases is utilized. The experimental results exhibit good agreement with the theoretical derivation and the circuit simulation.
Keywords :
CMOS integrated circuits; MMIC oscillators; circuit tuning; field effect MIMIC; frequency dividers; injection locked oscillators; millimetre wave oscillators; CMOS process; circuit simulation; frequency 13 GHz to 25 GHz; frequency 30 GHz to 45 GHz; multiple-input injection technique; size 0.18 micron; superharmonic frequency division; three-stage ring oscillator; tunable free-running frequency; wideband frequency divider; wideband injection-locked ring oscillator; CMOS process; CMOS technology; Circuit topology; Costs; Cutoff frequency; Frequency conversion; Frequency synthesizers; Inductors; Ring oscillators; Wideband; Injection-locked ring oscillators; locking range; multiple-input injection; superharmonic frequency dividers;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2007.903058
