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发表于 2009-11-18 10:46:50
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Usually we get 100-500MHz from a ring oscillator. So you need to put a divider to get 5MHz.
jshiao24 发表于 2009-10-23 18:40
yes, this is the right way for cover 100MHz~500MHz
if you design just like low MHz, also can not get the low freq like 5MHz (if you only get 5M~20M, it can do, but PLL not need!)
the freq tuning range is limited, always 3~5 for Ring OSC, 1%~50% for LC vco |
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