Active loop filter_amplifier Ibias generates large leakage spur

Document created by analog-archivist Employee on Feb 23, 2016
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I use ADF4002 and AD797 in phase lock loop,but there is very bad phase detect
frequency leakage,why?

 

The offset current and Bias current of AD797 will cause leakage spur, they need
to use a narrow loop bandwidth to suppress the spur.

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