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How to eliminate the effect of VCO capacitance to LPF?

时间:04-10 整理:3721RD 点击:
I an now designing a PLL with 3rd order loop filter. C3 in this filter is small, about 0.4 pF. This value is smaller that the varactor capacitance, which is even chagable. So how to eliminate this effect?
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