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sorry. x(_) is the input voltage, which is used to generate bias voltage VBP and VBN. The input voltage usually is the output of charge pump and LPF in PLL.
The VCO i used is popular Maneatis delay cell (symmetric load consist of a diode-connected PMOS device in shunt with an equally sized biased PMOS device). As i know, input voltage is higher, while the out frequency is higher.
but why my tuning curve is not normal? I am confused. why...
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