Interactive tool for quick calculation of design oriented ... - MOS-AK

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Mar 31, 2017 - Spreadsheets. • Mathematical software. • Octave. • Matlab. • The simulator itself. “Pen and Paper” calculations. The designers are on their own ...
Interactive tool for quick calculation of design oriented MOSFET parameters

A. Mangla T. Froehlich E. Seebacher March 31, 2017

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A design problem How to find an experienced analog designer Give two designers an analog design problem: Then see who goes to the simulator first

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A design problem The magic simulator funnel

Device Model

Model Card

Netlist

Simulator

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A typical design flow

• Gain • Area • Power budget • Speed Design Specifications

Topology Selection

• Gain stages • Voltage/Current references • Buffers

• Device sizes • Bias voltages & currents “Pen and Paper” Calculations

Simulation

• DC • AC • Transient • Etc.

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The simulator funnel A second look

Circuit topology

Device Model

Model Card

Netlist

Device sizes

Netlist

Simulator

Bias conditions

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The simulator funnel A second look

Circuit topology

Device Model

Model Card

Netlist

Device sizes

Netlist

Simulator

Bias conditions

“Pen & Paper” calculations needed

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“Pen and Paper” calculations The designers are on their own

Device Model

Design

Model Card

Simulator

• Model Developer • Modeling Engineer • EDA vendor

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“Pen and Paper” calculations The designers are on their own

Device Model

Design

Model Card

Simulator

• Model Developer • Modeling Engineer

Presimulation calculator

• ?

• EDA vendor

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“Pen and Paper” calculations The designers are on their own

What do the designers typically use? •

Pen and Paper!



Spreadsheets



Mathematical software • Octave • Matlab



The simulator itself

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“Pen and Paper” calculations The designers are on their own

What do the designers typically use? •

Pen and Paper!



Spreadsheets



Mathematical software • Octave • Matlab



The simulator itself

What are the limitations? • Sub-micron to sub-100-nm technologies are being used • Operating points are often in moderate to weak inversion

© ams AG Page 11

“Pen and Paper” calculations The designers are on their own

What are the limitations? • Sub-micron to sub-100-nm technologies are being used • Operating points are often in moderate to weak inversion • Simple Level 1 equations cannot be used to accurately determine relevant small-signal parameters

BSIM3v3 Manual Appendix B

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“Pen and Paper” calculations The designers are on their own

What do the designers typically use? •

Pen and Paper!



Spreadsheets



Mathematical software • Octave • Matlab



The simulator itself

What are the limitations? • Sub-micron to sub-100-nm technologies are being used • Operating points are often in moderate to weak inversion • Simple Level 1 equations cannot be used to accurately determine relevant small-signal parameters • There is no information about process variability © ams AG Page 13

“Pen and Paper” calculations The designers are on their own

What do the designers typically use?

What are the limitations?



Pen and Paper!



Spreadsheets

• Typical overhead to simulate a parameter is about 30 seconds • Long time in an iterative process



Mathematical software • Octave • Matlab



The simulator itself

• Limited number of licenses • Further delays

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A pre-simulation calculation tool Requirements

• Calculates the relevant small-signal parameters for elements available in a fab process • Easy to use interactively • Calculates the numbers quickly (< 1 s) • Use the same model set as used in the simulator • No license restrictions • (at least less severe restrictions than commercial simulators)

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ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 16

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 17

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 18

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 19

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 20

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 21

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 22

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 23

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 24

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 25

ams MOS dashboard An interactive tool for MOS sizing and biasing calculations

© ams AG Page 26

A pre-simulation calculation tool Who is the designers’ friend

Presimulation Calculator

•?

Device Model

• Model Developer

Model Card

• Modeling Engineer

Design

Simulator

• EDA vendor © ams AG Page 27

Thank you Please visit our website www.ams.com

© ams AG

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