Frequency domain analysis of double sampling phase-locked loop

Geza Kolumban, Bela Frigyik, Michael Peter Kennedy

Research output: Contribution to journalConference article


Double sampling phase-locked loop (2-SPLL) is used in frequency synthesis. The unique feature of single sampling PLL is that its phase detector (PD) has a very low unwanted periodic output in steady state. In 2-SPLL, a second sample and hold circuit (S&H) is connected in cascade to suppress further the unwanted periodic PD output. However, the absence of a proper baseband model and design equations prevent the exploitation of all benefits of 2-SPLL. This paper develops a nonlinear baseband model for the 2-SPLL. Then based on the linearized baseband model, analysis is performed in the frequency domain and the frequency responses required to determine the spectrum of the output signal as a function of reference and VCO noise and modulation inputs are developed. Finally, the theoretical results are verified by measurements.

Original languageEnglish
Pages (from-to)V-273-V-276
JournalProceedings - IEEE International Symposium on Circuits and Systems
Publication statusPublished - Jan 1 2000
EventProceedings of the IEEE 2000 Internaitonal Symposium on Circuits and Systems - Geneva, Switz
Duration: May 28 2000May 31 2000

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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