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Frequency Divider Circuit issue

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promach:
You can download the working circuit from https://github.com/promach/div_by_two

@SiliconWizard

By the way, my circuit is way more power-saving than yours in your post above.




Nevertheless, I am looking at another circuit below (c) with split-output latches that could further reduce the number of transistor and clock loading.

What do you guys think about this ?



SiliconWizard:

--- Quote from: promach on June 04, 2019, 12:59:40 am ---@SiliconWizard

By the way, my circuit is way more power-saving than yours in your post above.

--- End quote ---

I didn't notice a big difference. The sim gives an average of ~6.6µA with yours at 1.8V, 100MHz, and ~6.4µA under the same conditions with mine.
I pushed mine to 3.3V and 500MHz in the LTSpice file above and get  ~80µA. But give it the same conditions as yours and see. Likewise, with yours at 1.8V/500MHz, I get ~33µA, and ~32.4µA with mine. The difference doesn't look significant. And the point was to get it to simulate @3.3V, which doesn't work with yours. But do not hesitate to point out how you figured mine would draw more power, I may have missed something?

That aside, this circuit is basically some form of dynamic flip-flop and can be a bit tricky. Parasitic capacitances are actually part of the design rather than a problem, as long as they are correctly used. It will work properly under a limited range of conditions (including clock frequency and rise/fall times), so, to be used with caution. A quick overview here: http://www.seas.ucla.edu/brweb/papers/Journals/BRFall16TSPC.pdf

promach:
Could you explain how the asynchronous reset input, M10 works in resetting the entire circuit asynchronously ?

As you can see from the following circuit screenshots, the M10 reset signal does not work in all situations.







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