The trend in high performance switched-mode power supplies (SMPSs) is towards faster switching speed – high di/dt in the industry jargon. But there’s a challenge. Traditional workflows don’t work in the high di/dt era because they are blind to the spike voltages induced across layout parasitics, V_spike = L_parasitic * di/dt. Thus, in the high di/dt era, it is necessary to add a post-layout analysis step to the workflow, in between pre-layout circuit simulation and physical prototyping steps.
To do this you first build up the pre-layout circuit simulation from both general-purpose Advanced Design System (ADS) lumped element components and special-purpose components from this Library. Then you use ADS Momentum field solver to extract layout parasitics into an EM-based model that you can “back annotate” on to the pre-layout schematic and re-simulate. In this way, the spike voltages can be determined, and (using “What if…” design space exploration) reduced to an acceptable level before sending the design for fabrication. This “virtual prototype” method gives you insights from our advanced data displays and saves you expensive, time-consuming, non-deterministic board spins. In addition and unlike a lab “smoke test”, there are no destructive failures in a simulation! Save those precious power devices for a prototype design that post-layout simulation has given you confidence in.
To support this flow, the ADS W2375EP Power Electronics Library contains components specifically built for Power Electronics including components for closed loop feedback regulation of SMPSs. For example, the Pulse Width Modulator works with both the Transient Convolution and Harmonic Balance simulators. The component palette also provides easy access to ADS built-in component that are often used in power electronics.
Descriptions of each of the components are summarized in the table below.
Components included on the Power Electronics Palette
Pulse Width Modulator
Specially designed to work in both Transient Convolution and Harmonic Balance simulation. Harmonic Balance simulator gives the periodic steady state solution without a lengthy power-up transient and is particularly valuable in closed loop analyses such as loop stability in the presence of noise such as conducted EMI.
ASM GaN transistor model
The ASM GaN transistor model was recently standardized by an industry body, the Compact Model Coalition (CMC). ADS supports models created by your power device vendor and by Keysight model generation tools: W8598BP Power Electronics Model Generator, PD1000A Power Device Measurement System for Advanced Modeling, and the W8538EP IC-CAP GaN Power Electronics Modeling Add-on.
SiC PowerMOS transistor model
ADS supports SiC PowerMOS models created by your power device vendor and by Keysight model generation tools: W8598BP Power Electronics Model Generator, PD1000A Power Device Measurement System for Advanced Modeling, and the W8536EP/ET IC-CAP SiC PowerMOS Power Electronics Modeling Add-on.
Insulated gate bipolar transistor (IGBT) model
ADS supports IGBT models created by your power device vendor and by Keysight model generation tools: W8598BP Power Electronics Model Generator, PD1000A Power Device Measurement System for Advanced Modeling, and the W8537EP/ET IC-CAP IGBT Power Electronics Modeling Add-on.
Generic Gate Driver
This component is a useful placeholder in the early stages of a design, before a vendor-specific gate driver has been selected. Once a specific component has been selected, you can replace this one via the netlist importer. We support ADS, PSPICE, LTspice, HSPICE, Spectre, and Berkeley dialect of SPICE decks.
Generic MOSFET model
As with the generic gate driver above, this component is a useful placeholder in the early stages of a design, before a vendor-specific power device has been selected. Once a specific component has been selected, you can replace this one using the appropriate model card. Unlike ideal switch component, this model is continuously differentiable. Unlike simple Berkeley SPICE models like Level 1 MOS, this model conserves charge. Together, these improve simulation convergence. In addition, this model is close to a physically realizable transistor. In contrast, ideal switch is, in general, not physically realizable.
Physics-based model of winding, air gap, and hard and soft ferromagnetic core. Implements a modified Jiles-Atherton core model that is more simulator-friendly than other implementations, with improved accuracy. You can specify the core saturation and hysteresis behavior either from a) the traditional J-A parameters (saturation magnetization, M_s; magnetization reversibility, c; domain wall density, a; pinning break average energy, k; interdomain coupling, alpha) or b) from measurements extracted from the B-H curve. You can create a simple inductor or a complex multi-tap transformer using MMF/flux magnetic circuits.
Analog behavior of logic gates
Starter components (BUF, INV, AND) towards eventual full sublibrary with analog behavior of logic gates.