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Optimizing a circuit to get the minimum power consumption

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melkord

Full Member level 2
The example from here shows that how, by selecting the correct gm/Id or IC, we can minimize power consumption on common source amp (single MOSFET).

My question:
how can I do the same exploration, e.g., finding minimum power consumption, on a more complex circuit?

I have read Binkley's book. I have made several versions of my circuit based on different gm/Id.
From those versions, I can show which version is the best given the same power.
But it still does not prove that the best out of 3-4 versions is the really best one, i.e., I might have missed the optimum point.

If anyone have some paper or other references about this exploration, I would be grateful to be informed.

arthorios

Member level 3
I have read Binkley's book. I have made several versions of my circuit based on different gm/Id.
From those versions, I can show which version is the best given the same power.
But it still does not prove that the best out of 3-4 versions is the really best one, i.e., I might have missed the optimum point.
The best version in terms of what? It is the best but then not the best? If I understand correctly, you want to optimize your design for power, i.e., you want to meet your specs with less power. So how do you compare the best version of your design using the same power? I assume you are simply sweeping gm/id (or IC) and finding the one that gives you the highest GBW.

The plot in Fig. 5 shows that there is a trade-off between speed and power and that for a given GBW spec you have an optimum. If you read Binkley, you will see that this trade-off comes from the transistor's operation from strong to weak inversion, i.e., higher speeds at strong and lower speeds at weak inversion. So the optimum will depend on your spec.

Other than Binkley for optimization, I would also recommend the following papers from Prof. Willy Sansen.
https://ieeexplore.ieee.org/document/6815423

Hope this helps.
--- Updated ---

I have read Binkley's book. I have made several versions of my circuit based on different gm/Id.
From those versions, I can show which version is the best given the same power.
But it still does not prove that the best out of 3-4 versions is the really best one, i.e., I might have missed the optimum point.
The best version in terms of what? It is the best but then not the best? If I understand correctly, you want to optimize your design for power, i.e., you want to meet your specs with less power. So how do you compare the best version of your design using the same power? I assume you are simply sweeping gm/id (or IC) and finding the one that gives you the highest GBW.

The plot in Fig. 5 shows that there is a trade-off between speed and power and that for a given GBW spec you have an optimum. If you read Binkley, you will see that this trade-off comes from the transistor's operation from strong to weak inversion, i.e., higher speeds at strong and lower speeds at weak inversion. So the optimum will depend on your spec.

Other than Binkley for optimization, I would also recommend the following papers from Prof. Willy Sansen.
https://ieeexplore.ieee.org/document/6815423

Hope this helps.

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