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Optimization of circuit structure

patschouly

Is it possible to let the optimizer in ADE Assembler change the circuit structure? I recently had a few cases that I could have used that:

  • Ideal bias current for a current mirror in a current-starved ring oscillator. Here I placed several unit devices in series (virtually enlarging the mosfet length). I did some trial-and-error in order to find the right number of series divces, which worked, but I wondered if there is an automated way.
  • Finding the devices with the right treshold voltage: I had a source follower where I could see some dependence on the threshold voltage, but the lowest was not necessarily the best. I would like to try various device parameters additionally to different threshold voltages (something that is tied to the instance)

I'd be happy for any suggestions on how to efficiently do these kind of things.

Thanks,

Patrick

Parents

  • Patrick,

    The only real way of doing this would be to have a schematic PCell for each case, Often that's available for series-connected devices in advanced nodes because they are commonly used, but would be not too difficult to create (particularly if you had PCell Designer). Similarly for the second, it would be possible to have a schematic PCell that morphed into one of a number of different VT transistors based on a parameter.

    Perhaps worth talking to customer support about though...

    Andrew

Reply

  • Patrick,

    The only real way of doing this would be to have a schematic PCell for each case, Often that's available for series-connected devices in advanced nodes because they are commonly used, but would be not too difficult to create (particularly if you had PCell Designer). Similarly for the second, it would be possible to have a schematic PCell that morphed into one of a number of different VT transistors based on a parameter.

    Perhaps worth talking to customer support about though...

    Andrew

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