Phase-interpolator based PLL frequency synthesizer

A phase lock loop frequency synthesizer includes a phase rotator in the feedback path of the PLL. The PLL includes a phase detector, a low pass filter, a charge pump, a voltage controlled oscillator ("VCO"), and a feedback path connecting output of the VCO to the phase detector. The feedba...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	CHEN CHUN-YING, WAKAYAMA MYLES, LE MICHAEL Q
Format:	Patent
Sprache:	eng
Schlagworte:	AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TOANOTHER ELECTRICITY INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER PHYSICS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	A phase lock loop frequency synthesizer includes a phase rotator in the feedback path of the PLL. The PLL includes a phase detector, a low pass filter, a charge pump, a voltage controlled oscillator ("VCO"), and a feedback path connecting output of the VCO to the phase detector. The feedback path includes a phase rotator connected to the output of the VCO and to an input of a frequency divider. Coarse frequency control is implemented by adjusting the input reference frequency to the phase detector or by adjusting the divider ratio of the frequency divider. Fine frequency control is achieved by increasing or decreasing the rotation speed of the phase rotator. The phase rotator constantly rotates phase of the VCO output, thereby causing a frequency shift at the output of the phase rotator.