CAD SUPPORT: A.D.S. (Analog Design System)

SGS-THOMSON Microelectronics has introduced

a sophisticated CAD approach to reduce the

development leadtime and to increase design

flexibility and safety.

Programmable cells in the library are defined as:

q

alternative cell or,

q

adjustable cell or,

q

telescopic cell or,

q

parametrisable cell

Some specific parts of the design are automatically

handled by an analog design manager, in order to:

q

reduce capture errors

q

make unexperienced designer’s task easier

q

improve schematics lisibility

q

check electrical design rules (Analog or Digital)

The Analog Design manager takes into account:

q

transconductance block generation

q

automatic cell biasing

q

unconnected pins and power down processing

q

multipower supplies processing

A major step has been made with the introduction

of function generator and compiler approaches to

improve design automation and design efficiency.

Operational amplifier generator

From a generic symbol and some properties,

several parameters of the amplifier will be adjusted:

q

Biasing current which controls major parameters

of amplifier (gain-bandwidth, slew rate, power

consumption).

q

Frequency compensation which allows to adjust

and optimize the dynamic parameters versus the

capacitive and resistive load.

q

Power down capabilities.

q

Supply voltage of the cell.

A specific software manages all these properties

and automatically updates all libraries included in

the design flow: macro models and transistor level

models, footprint, GDS2 layout, LVS netlist.

Figure 3: Analog Design System (A.D.S.) flow

Digital Analog

Symbols

Schematic

Capture

Data Base

Filter Compiler

DIGITAL

Generator

D

Netlist

Extractor

Analog Generator

G

G

Programmable Cells

Generation

G

Behavioral

Models

Top Level

Simulation

SABER

Digital

Models

D

G

Transistor

Models

Place & Route

Cells Boxes

G

Analog

Simulation

ST SPICE

Digital

Simulation

HILO 3

Back Annotation

GDSII File

DRC/LVS

Cells

Layout

G

PG Tape

®

STKM2000 SERIES

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