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Tom Van Breussegem
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re: Microwatt charge pump boosts 1V to 1.8V at 90% efficiency
Tom Van Breussegem   10/11/2011 7:29:52 AM
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It seems that you made an error in calculating the efficiency. The maximum theoretical efficiency of a voltage doubler turning 1V into 1.8V is allready 90%. So the additional losses of the peripheral circuitry degrades this even more.

MartinT@Sageloop
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re: Microwatt charge pump boosts 1V to 1.8V at 90% efficiency
MartinT@Sageloop   10/12/2011 7:05:24 PM
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You're right Tom- but efficiency approaches 90% asymptotically for 1.8V out, and the 1.8V is minimum V at max load (higher at lighter loads). General point trying to make is that it seems one can build a reasonable simple pump oscillator with these sub-uA op amps. Thanks.

MartinT@Sageloop
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re: Microwatt charge pump boosts 1V to 1.8V at 90% efficiency
MartinT@Sageloop   10/12/2011 7:15:41 PM
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(.. continuing).. the calcs are right, the overhead losses are very low and the output voltage is higher than 1.8V at light loads (1.8V is min). - Martin

Tom Van Breussegem
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re: Microwatt charge pump boosts 1V to 1.8V at 90% efficiency
Tom Van Breussegem   10/13/2011 9:15:20 AM
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OK, thanks for clarifying this, indeed nice design considering the low output power.



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