4.8 GHz CMOS Frequency Multiplier Using Subharmonic Pulse-Injection Locking for Spurious Suppression

Kyoya TAKANO  Mizuki MOTOYOSHI  Minoru FUJISHIMA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C   No.11   pp.1738-1743
Publication Date: 2008/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.11.1738
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
frequency multiplier,  injection locking,  pulse,  low power consumption,  small chip size,  CMOS,  

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Summary: 
To realize low-power wireless transceivers, it is necessary to improve the performance of frequency synthesizers, which are typically frequency multipliers composed of a phase-locked loop (PLL). However, PLLs generally consume a large amount of power and occupy a large area. To improve the frequency multiplier, we propose a pulse-injection-locked frequency multiplier (PILFM), where a spurious signal is suppressed using a pulse input signal. An injection-locked oscillator (ILO) in a PILFM was fabricated by a 0.18 µm 1P5M CMOS process. The core size is 10.8 µm10.5 µm. The power consumption of the ILO is 9.6 µW at 250 MHz, 255 µW at 2.4 GHz and 1.47 mW at 4.8 GHz. The phase noise is -105 dBc/Hz at a 1 MHz offset.