Community RF Design BER vs BER approx

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BER vs BER approx

aalbason

Hello there,

I am simulating a high speed amplifier design and to evaluate the system performance I plot the so-called "bathtub curve". I have to questions regarding my current simulation:

1.) How does ViVA-XL calculate the BER approx and how reliable is it? I have read the user guide (November 2023) and cannot seem to find documentation or mention of it. I cannot find it also if I scour the internet / Cadence forums.

2.) My target is to have a BER smaller than 10e-12. My simulations so far (without the BER approx) yield only until 10e-8. How do you setup a simulation to reach as low as 10e-12? Is it just a longer simulation time (i.e. more data)?

3.) In my specific simulation the BER approx (left) is only a single point. I was expecting a number of points to form the "bathtub curve". What could be wrong with my simulation or way of calculating BER?

Thank you,

Al

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