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New suppression scheme of ΔΣ fractional-N spurs for PLL synthesizers using analog phase detectors

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3 Author(s)

This paper presents a new suppression scheme of ΔΣ fractional-N spurs for PLL synthesizers using analog phase detectors. The proposed scheme optimizes a phase difference of two phase-detector input signals to suppress spurious emissions caused by the ΔΣ fractional modulation. The phase difference is controlled by a preset signal for phase lock acquisition. The developed VHF-band ΔΣ fractional-N PLL synthesizer with a 2nd order MASH modulator suppresses the largest spurious level by 15dB using the proposed scheme.

Published in:

Microwave Symposium Digest, 2005 IEEE MTT-S International

Date of Conference:

12-17 June 2005

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