Modeling of voltage output charge-pump phase frequency detector in tuning loops
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, cilt.52, sa.6, ss.304-307, 2005 (SCI-Expanded, Scopus)
- 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.