PHASE LOCKED LOOP CIRCUIT

PURPOSE:To prevent the generation of a phase shift between a pilot signal and the output signal of a voltage control oscillator by controlling the natural oscillation frequency after detecting a phase error between said both signals. CONSTITUTION:When the natural oscillation frequency of a voltage c...

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Bibliographische Detailangaben
1. Verfasser:	KAKIHARA EISHIN
Format:	Patent
Sprache:	eng
Schlagworte:	AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY BROADCAST COMMUNICATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent the generation of a phase shift between a pilot signal and the output signal of a voltage control oscillator by controlling the natural oscillation frequency after detecting a phase error between said both signals. CONSTITUTION:When the natural oscillation frequency of a voltage control oscillator has a change, the DC voltage is generated between output terminals. This DC potential difference is detected and amplified by a differential amplifier consisting of transistors TRQ5 and Q6 and then filtered through an LPF15 consisting of a resistance R6 and a capacitor C2. This signal is applied to the control input terminal of the voltage control oscillator from an output terminal 26 via a differential amplifier consisting of TRQ9 and Q10 to compensate the variation of the natural oscillation frequency.