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DC run and Transient Response in Cadence ADE

FMRLI

Hi,

Why the circuit showing differnt transient response from DC operating points for an Op-AMP in Cadene ADE?

If the circuit is keeping the values at a fixed DC operating points, the transeint signal moved to another common node voltage.

Thanks in advance!!

  • Your question is extremely unclear. However, let me have a guess at what the problem might be - although I may be wrong given the rather limited information as to what the problem actually is (you didn't really describe what was going on).

    The DC analysis will perform the DC operating point at the DC value of each source, or the time zero value of the source if no DC value is given. The initial DC solution of a transient analysis will always be based on the time zero value. These might be different if you have a time-varying waveform and have also specified a DC value on a source. For example, for a sinusoidal source, the DC value typically sets the mid-value of the sine wave, but if  a non-zero phase is specified, the time zero value will be different from the DC value. Capacitors and so on will be charged dependent upon whatever the time-zero value is in the transient analysis. Similarly a pulse or PWL source will behave differently if it has both a DC value and an initial transient value which is different.

    If this doesn't describe what you're seeing, you'll need to provide more details for anyone to stand a chance of solving your problem, whatever it is...

    Kindest Regards,

    Andrew.

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