Impact of Current loading for voltage multiplier

AI Thread Summary
The discussion focuses on the effects of current loading in a 4-stage DC-DC converter charge pump circuit. The circuit produces an output voltage of approximately 4.6V from a 1V input, which is slightly below the expected 5V. Current loading impacts the output by causing ripple due to the output capacitor being charged briefly and discharging into the load, leading to a varying component on the DC output. To mitigate this ripple effect, using larger output capacitors is suggested. Understanding these dynamics is crucial for optimizing the performance of capacitor filter systems in similar applications.
shaikss
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Hi,


Can you please let me the impact of current loading for the attached circuit?
The attached circuit is a 4-stage dc-dc converter- charge pump.
When I give an input voltage of 1V, the output voltage is around 4.6 V using cadence simulations. The expected output voltage is 5V.
I am able to understand and see the increase in the output voltage from stage to stage.
But I am unable to understand the impact the current loading.

I have attached the circuit and the plots which I got.

Can you please let me know the effects of current loading of the above circuit?
 

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This happens with most or all capacitor filter systems.

The output capacitor is only charged briefly by the rectified DC, and during the rest of the cycle, the capacitor discharges into the load. This causes "ripple" on the output. This is a DC output that has a varying component on top of it.

So, what you measure is the average value of the DC output, plus ripple.

Ths solution is to use larger capacitors.
 

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