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Could I get materials or papers about this ring osc..

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tyeiei

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I have 9 stage CMOS ring osc. (Target : 20MHz)

But, this circuit was design by another engineer, not me.

1. How can I get study materials about this circuit?

2. In measured data, this osc operates about 24MHz.(22~26MHz)
So, How can i control or trimming this circuit to meet the target?

Plz, help me..

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