Modeling of voltage output charge-pump phase frequency detector in tuning loops

Karaca H., KILINÇ S., Yuksel Y.

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, cilt.52, sa.6, ss.304-307, 2005 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 52 Sayı: 6
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1109/tcsii.2005.848953
  • Dergi Adı: IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.304-307
  • Anahtar Kelimeler: phase frequency detectors, phase-locked loops (PLLs), resonant inverters, tuning circuits
  • Dokuz Eylül Üniversitesi Adresli: Evet

Özet

Resonant inverters mostly employ tuning loops based on a phase-locked-loop (PLL) circuit. Some commercially available PLL chips, frequently used in this application, include a voltage output charge-pump phase frequency detector (CP/PFD) rather than well-known current output CP/PFD, which complicates the analysis of the loop. We present a new model for voltage output CP/PFD and an analysis of a tuning loop using this model. The proposed model employs the resistance multiplication approach, which is applicable for the circuits containing periodically operated switches. It is shown that a voltage output CP/PFD in conjunction with a simple RC low-pass filter can be modeled using a dc voltage source, a phase error controlled resistor, and a capacitor. The theoretical study is verified by experimental results.