re: charge pump design

• May 19, 2005

• #1

vijay_nag

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re: charge pump design

hi!

can anybody suggest me any articles or links giving indepth explanation about charge pump design?

regards,
vijay

 

• May 19, 2005

• #2

mmohsen

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Hi
here are some papers about CP's design , i think the first two are the most important.

[1] W. Rhee, “Design of High-Performance CMOS Charge-Pumps in Phase LockedLoops”, in Proc. ISCAS, vol.2, pp 545 – 548, 1999


[2] Mohamed EL.H. & F. Yuan“ Architecture and design consideration of
CMOS Charge pumps for PLL’s”,Ryerson Uni.

[3] Jeffrey S. Pattavina, “Charge Pump PLL Analysis “, August 06,2001

[4] B. Razavi “Design of Analog Integrated Circuits ”McGraw-Hill ,PP 566-567,2001

[5] Esdras Juárez-Hernández & Alejandro D. Sánchez “A Novel CMOS Charge-pump Circuit With Positive Feedback For PLL Applications” Proc. ICECS, 2001

contact me if you need more help or if you couldnot download them,

best regards,..

Mohamed Mohsen

 

• May 20, 2005

• #3

vijay_nag

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hi!

i tried searching the first 2 artilces in google, but i could not get the links. can you please send me the links?

regards,
vijay

 

• May 20, 2005

• #4

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amarnath

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re: charge pump design

what is so special about designing charge pump.if u know basic transistor sizing u should be able to do that.just calculate the amount of current to be sourced and sunk by the charge pump and size the transistors accordingly,also u have charge pump structures available to reduce charge sharing and also minimize the effects of current mismatch in the charge pump.

regards
amarnath

 

• May 20, 2005

• #5

mmohsen

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Hi
Here is the first paper as i think you will not be abale to download it from google
for free.

Mohamed Mohsen

 

• May 24, 2005

• #6

mmohsen

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re: charge pump design

join this topic for more about PFD/CP's


redards

 

• Sep 12, 2005

• #7

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bobxing

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re: charge pump design

thank you very much

Added after 1 minutes:

I think what trouble me most is the matching of the PMOS source and NMOS sink.

 

• Sep 12, 2005

• #8

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wjx197733

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re: charge pump design

What is charge pump?and the role of it is what?

 

• Sep 13, 2005

• #9

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drtime

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Charge-pump voltage converters use ceramic or electrolytic capacitors to store and transfer
energy.
there are not many info about charge pump online,i mean google,maybe u can refer to pdf file below.

 

• Sep 13, 2005

• #10

J

Johnson

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What is the main role of charge pump circuit, I mean specially in PLL circuits? The above pm just talk about DC-DC conversion capability of them!

 

• Sep 14, 2005

• #11

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boyet_919

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charch pump has a very critical role in a pll design.

the basic parts of the pLL are as follows:

O- comparator(PFD) -> Loop Filter ->VCO---
^_________ frequency divider________|


actually, the charge pump is part of the loop filter.
it charges/discharges the capacitor(filter) according to the signals entering the comparator.

the loop filter then controls the frequency by varying the voltage, thus VCO.

hope this helps..

 

• Sep 14, 2005

• #12

Ante

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Here is another one on this topic:

 

• Sep 15, 2005

• #13

tanuki

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A charge pump is a phase error intergrator.

Two linear current sources , one postive and one negative (pumps), either add charge to (phase lagging error), or remove charge from (phase leading error) a capacitor (the accumulator).

You will need to study "Feedback Control Theory" to understand circuits more completely.

Some online text:

https://www.nationmaster.com/encyclopedia/Control-theorySome online text:

https://www.nationmaster.com/encyclopedia/Control-theory

**broken link removed**

**broken link removed**

Use Google for more articles