Page 102 - DLIS402_INFORMATION_ANALYSIS_AND_REPACKAGING

Unit 4: Technical Digestion

(such as the well known SPICE transistor models), which try to capture the electrical behavior of Notes
such devices but do not generally derive them from the underlying physics. (However, the SPICE
simulator itself is usually considered as part of ECAD rather than TCAD).

Diagram is given below
See SPICE for an example of a circuit simulator
See semiconductor device modelling for a description of modelling devices from do pant profiles.
See semiconductor process simulation for the generation of these profiles.
See BACPAC for an analysis tool that tries to take all of these into account to estimate system
performance.
Diagram-1

Figure 4.2

Extrinsic (and Layout) Intrinsic (active/passive devies)

Circuit
PSM I Deat (A/m) (drive current)
800
D
600
NMOS
F Device 400
CMP M 200 0.25 PMOS
0.1 0.2 0.3 0.4 0.6 0.8 1.0
Channel length ( m)

Process
STI

Hierarchy of technology CAD tools building from the process level to circuits. Left side icons show
typical manufacturing issues; right side icons reflect MOS scaling results based on TCAD.

Introduction

Technology files and design rules are essential building blocks of the integrated circuit design process.
Their accuracy and robustness over process technology, its variability and the operating conditions
of the IC—environmental, parasitic interactions and testing, including adverse conditions such as
electro-static discharge—are critical in determining performance, yield and reliability. Development
of these technology and design rule files involves an iterative process that crosses boundaries of
technology and device development, product design and quality assurance.

Modelling and simulation play a critical role in support of many aspects of this
evolution process.

The goals of TCAD start from the physical description of integrated circuit devices, considering
both the physical configuration and related device properties, and build the links between the broad
range of physics and electrical behavior models that support circuit design. Physics-based modelling

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