New Features for Solving HSD Challenges with ADS 2013 IBIS Power Birds in ADS 2013.06 Agilent EEsof EDA Ming Yan June 17/18/20, 2013 “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 1 Outline Introduction to IBIS Power Birds IBIS Power Birds in ADS 2013.06 IBIS Bird 95.6 and 98.3 IBIS Birds Simulation Example “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 2 Introduction to IBIS Power Birds Simultaneous switching noise (SSN) is a major cause of power supply noise, which can degrade signal integrity. In the past, SSN simulation required a detailed device level simulation and it usually took a long time to simulate. IBIS model is a behavior model and can reduce significantly the simulation time. However, it did not previously include the power supply details needed for SSN simulation. The IBIS Power Birds do address this issue. “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 3 IBIS Power Birds in ADS 2013.06 Bird 95.6 - Power Integrity Analysis using IBIS Keyword [Composite Current] Describes the current waveforms from the power supply Bird 98.3 - Gate Modulation Effect (table format) Keywords [ISSO PU] and [ISSO PD] ISSO – Simultaneous Switching Output Current Defines the effective current of the pullup/pulldown devices as a function of the voltage on the pullup/pulldown reference nodes Bird 141 - [Composite Current] Clarifications Keyword [Composite Current] Removes the requirement that the [Composite Current] table must be time-correlated with the V-T data “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 4 IBIS Bird 95.6 Power Integrity Analysis using IBIS Source: IBIS Version 5.1 Specification “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 5 IBIS Bird 98.3 Gate Modulation Effect Isso_pd Isso_pu Low State (logic zero) Vcc (or pullup reference typ/min/max value) PU Isso_pd (function of Vtable from -Vcc to Vcc) Vcc (or pullup reference typ/min/max value) PD + Vtable GND (or pulldown reference typ/min/max value) Source: IBIS Version 5.1 Specification “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 6 IBIS Bird 98.3 Gate Modulation Effect ISSO Factor Ksso_pu(Vtable_pu) = Isso_pu(Vtable_pu)/Isso_pu(0) Ksso_pd(Vtable_pd) = Isso_pd(Vtable_pd)/Isso_pd(0) Source: IBIS Version 5.1 Specification “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 7 IBIS Birds Simulation Example 1 2 Source of the IBIS File: courtesy of IBIS Open Forum; used with permission “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 8 IBIS Birds Simulation Results 2 mA/division 1 mV/division 500 mV/division 0.5 mV/division “New Features for Solving HSD Challenges with ADS 2013” Copyright © 2013 Agilent Technologies 9