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huangjw
Joined: 10 May 2005
Posts: 36
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 11 Apr 2007 7:28 Charge pump design |
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hi,
i will design a charge pump, and the cap can integrate in the chip and it can load up to 1mA current. which way can save the die size.
there is way that use a small cap and some other circuit can obtain a big cap, does this way fit charge pump design, and can you give me some paper on it.
thank you!
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huangjw
Joined: 10 May 2005
Posts: 36
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| 16 Apr 2007 4:27 Charge pump design |
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| can anybody help me
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tekno1
Joined: 26 May 2005
Posts: 85
Helped: 5
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| 16 Apr 2007 13:08 Re: Charge pump design |
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Hi Huangjw,
your question is not clear.
The size of the capacitor (assuming optimized circuit and for the same input output voltages) scales with the amount of the output current. Different topologies have different efficiencies so capacitor sizes are different.
For 1 mA output current what is your input voltage range and output voltage requirement?
You are mentioning to save die area. You save die area by making capacitors external to chip since for 1mA your transfer capacitors will be very large.
I can not say much about this. To do so since you need to describe (as specifications) of your target design, process (like poly to poly cap is smaller than metal to metal cap, number of metal layers ... ) etc..
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