about phase frequency detector in PLL

From: msdeshp@xxxxxxxxx
Date: 8 Dec 2005 12:17:14 -0800

In the Phase frequency detector of PLL, we should get up and down
signal --narrow/broad depending on the phase / freq dfference... but I
am getting spikes at a constant interval in the output up and down
signals... what should I make of it??

any suggestions??
Thanks

.

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