Semiconductor integrated circuit having a phase locked loop

Details Semiconductor integrated circuit having a phase locked loop Semiconductor integrated circuit having a phase locked loop

1998-02-23

1999-10-26

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular error voltage control

331 8, 331 25, 331 44, 331 74, H03L 706, H03L 718

Patent

active

059735716

ABSTRACT:
A phase locked loop in a LSI comprises a phase comparator, a low-pass filter, a voltage controlled oscillator and a frequency divider, and receives an input clock signal to output an internal clock signal obtained by multiplication of the input clock signal. The output of the low-pass filter is supplied through a voltage follower from an external pin toward outside the integrated circuit. The output voltage of the low-pass filter is evaluated during a test mode for evaluating the function of the phase locked loop without affecting the characteristics of the phase locked loop.

REFERENCES:
patent: 4410861 (1983-10-01), Werner
patent: 5295079 (1994-03-01), Wong et al.
patent: 5543761 (1996-08-01), Klughart
patent: 5625319 (1997-04-01), Miki

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