"Real World" Problems in the Analog and Mixed Signal Domains
"Real World" Problems in the Analog and Mixed Signal Domains
"Real World" Problems in the Analog and Mixed Signal Domains
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Verification of <strong>Analog</strong> circuits<br />
• Transistor level models<br />
• Circuit simulator (Spice)<br />
• DC simulation<br />
• AC simulation<br />
• Parameter sweep<strong>in</strong>g<br />
• Statistical variation (Monte Carlo)<br />
• Tools: SPICE (HSPICE, PSPICE, Spectre,<br />
eldo, …)<br />
• Transient (time based) simulation is very<br />
expensive<br />
• Simulation <strong>in</strong>puts based on designers’<br />
underst<strong>and</strong><strong>in</strong>g/experience/<strong>in</strong>tuition<br />
DCC 08<br />
Slide 9<br />
AC Analysis is a Formal Method for <strong>Analog</strong><br />
DCC 08<br />
Slide 10<br />
• AC analysis <strong>in</strong> SPICE<br />
provides <strong>the</strong> transfer<br />
function (TF)<br />
• TF: a complete description<br />
of <strong>the</strong> l<strong>in</strong>ear system <strong>in</strong><br />
frequency doma<strong>in</strong><br />
• No fur<strong>the</strong>r need to simulate circuits <strong>in</strong><br />
transient simulation as long as <strong>the</strong> <strong>in</strong>put<br />
signals rema<strong>in</strong> small<br />
• The circuit is formally verified
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