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Introduction to PLLs - Engineering

Introduction to PLLs - Engineering

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29 Charge Pump Design zSelect W/L of current sources for an overdrive of about 50-100 mV. zChoose L such that mismatch due to channel- length modulation remains below 10-20%. zChoose switch dimensions for a headroom consumption of 20-30 mV. zIf mismatch due to channel-length modulation results in excessive jitter or sidebands: (a) Increase C 2 and Cp (BW goes down).

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