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What are the advantages of using a unity gain buffer in the charge pump in PLL?

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ahmed709

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what are the advantages of using a unity gain buffer in the architecture of the charge pump in PLL

tahnks in advance
 

Re: charge pump question

Sorry for the late reply...

The unity gain buffer is used to decrease voltage step at the CP output at turn on. Due to charge sharing between the output node and both other sides of the N or P switch, the voltage at the CP output shows a step when both swirchs are turned on, while in idal case the output, which is the control voltage should remain quite... to decrease this effect the buffer is added...
 

    ahmed709

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Re: charge pump question

aomeen said:
Sorry for the late reply...

The unity gain buffer is used to decrease voltage step at the CP output at turn on. Due to charge sharing between the output node and both other sides of the N or P switch, the voltage at the CP output shows a step when both swirchs are turned on, while in idal case the output, which is the control voltage should remain quite... to decrease this effect the buffer is added...

hello,
Should you tell me what the SPEC of the unity gain buffer.
And if the CP is working at 50MHz, how about the bandwidth of the unit gain buffer?

thank you!!
 

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