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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.
Published in:
Solid-State Circuits, IEEE Journal of
(Volume:42
,
Issue:
9
)
Date of Publication: Sept. 2007
- Page(s):
- 1906 - 1915
- ISSN :
- 0018-9200
- INSPEC Accession Number:
- 9610162
- Digital Object Identifier :
- 10.1109/JSSC.2007.903058
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 27 August 2007
- Issue Date :
- Sept. 2007
- Sponsored by :
- IEEE Solid-State Circuits Society
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