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How to know the maximum Vds and Vgd voltage

Detailer

Hi all,

Is there any way to know the maximum allowed Vds and Vgd voltage? I am using a 130 nm Bulk process with a supply voltage of 1.2 V. I am designing a class E and the drain voltage is equal to 3.5 * Vdd. Even with a cascode configuration, I get around 2.3V on the common source transistor. The cadence does not display any warning but It did not display a warning when the drain-source voltage was 3.8 so Smile. 

Do UMC or TMC usually release maximum ratings pdf's?

Cheers and thanks in advance

Alex

  • ShawnLogan

    Dear Alex,

    Detailer said:
    Is there any way to know the maximum allowed Vds and Vgd voltage? I am using a 130 nm Bulk process with a supply voltage of 1.2 V.

    The maximum voltages you are trying to determine are not fixed constants for a specific technology, but depend on:

    1. A specific reliability requirement  (i..e., lifetime (number of years), temperature, supply voltage)

    2. Device configuration

    3. The temporal characteristics of the voltage applied to the device

    There is not a single mechanism leading to device failure and hence the manner in which one determines the reliability of a design is to perform a series of simulations (DC and transient) that mimic the modes of operation for the circuit over its lifetime. One or more reliability audits are performed on the simulation results to assess if the reliability meets your circuit requirements. Many vendors provide tools for such audits - including Cadence. Cadence provides Voltus-XFi and means to include foundry supplied reliability information natively in ADE. See, for example:

    https://community.cadence.com/cadence_blogs_8/b/cic/posts/spectre-tech-tips-device-aging-yes-even-silicon-wears-out

    Hence, I don't think there is a single number that can be specified as the maximum allowed Vdd or Vgd.

    Shawn

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