Phase locked loop circuit

Details Phase locked loop circuit Phase locked loop circuit

H - Electricity

03

L

328/28, 331/40

H03L 7/08 (2006.01) H03D 1/22 (2006.01) H03L 7/107 (2006.01)

Patent

CA 1168714

ABSTRACT OF THE DISCLOSURE A PLL circuit having a phase detector supplied with output signals from a reference signal supply source and a voltage controlled oscillator for detecting a phase difference between both the output signals, a low pass filter for receiving an output signal from the phase detector, an output signal from the low pass filter being applied to the voltage controlled oscillator to lock the oscillating frequency thereof to the frequency of the output signal from the refer- ence signal supply source, and a circuit supplied with the output signals from the reference signal supply source and the voltage controlled oscillator for detecting that the PLL circuit is locked is disclosed, in which the low pass filter has a differential amplifier including at least a pair of transistors, a variable current supply source provided at the side of emitters of the transistors, bases of the pair of transistors being supplied with the output signal from the phase detector, a filter element connected to one of the collector of the pair of transistors and the variable current supply source being controlled by the phase lock detecting circuit so that when the PLL circuit is locked, the capture range of the PLL circuit is narrowed while when the lock is lost, the capture range thereof is widened.

400926

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