The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Simulators >> Circuit Simulators >> VCD file stimulus converted to odd signal levels in Spectre Sims
https://designers-guide.org/forum/YaBB.pl?num=1214541957

Message started by aval on Jun 26^th, 2008, 9:45pm

Title: VCD file stimulus converted to odd signal levels in Spectre Sims
Post by aval on Jun 26^th, 2008, 9:45pm

Hi,

We are trying to simulate a PLL with the digital signals being driven from a VCD file. This simulation is run using Cadence Spectre. Three of the digital signals (driven by the VCD file) are driven to some odd signal level (about 0.3V or so).

Viewing the VCD file in simvision shows these signals to be OK (either at 0 or 1)

All other signals are ok and at the correct voltage levels as specified in the sig file?

Any ideas on why just a few signals would have some really odd voltage levels? The sig file seems ok.

thanks in advance,
Aarathy