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April 16-17, 2009

Etienne SICARD etienne.sicard@insa-toulouse.fr

www.etienne-sicard.fr

INSA Toulouse, FRANCE

Analog CMOS Design Analog CMOS Design

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AGENDA

First day : 9h - 12h: Mos Implementation - Inverter

Second Day: 14h - 17h: Basic Cell Design

Second day: 9h - 12h: Mini-project 1/2

Second Day: 14h - 16h: Mini-project 2/2 – Mini presentation

OBJECTIVES

At the end of the course, the auditor will be able to design and simulate

basic analog cells and understand the link between design parameters and

electrical performances.

PRE REQUISITES

Basic knowledge in CMOS technology, electrical circuits and MOS models.

Outlines

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• All notions may be illustrated with Microwind

Microwind is a friendly and free PC tool for designing and simulating microelectronic circuits at layout level.

http://www.microwind.org

Microwind

Version used in 2009: version 3.5 “beta”

Temporary installation permitted

Copying or diffusion prohibited

Lite version free for download at www.microwind.net

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• http://www.etienne-sicard.fr/cours/cmos • Logiciel de conception de circuits micro-électronique • Unzip in “My Documents/Temp”• Open “/system”, double click “Microwind35.exe”• Documentation : click “Livre CMOS de base” ch2 – pp21

Getting Started

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Microwind Main Screen

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Most important icons

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1. MOS Implementation

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Problem 1

• Draw a n-channel MOS

• See the MOS in 2D

• Measure Ion, Ioff

• Simulate the switch (ch2 – pp 21)

• Summarize the n-channel behavior

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Draw a n-channel MOS

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2D section of a n-channel MOS

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Source (Si)

Polysilicon gate

Gate oxide

Horizontal strain created by the silicon nitride capping layer

Drain (Si)

Drain (Si) Source

(Si)

Tensile Strain

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Ion, Ioff

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Ion, Ioff

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Transient Simulation

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Transient Simulation

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N-channel MOS summary

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Draw a p-channel MOS

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2D section of a p-channel MOS

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Compressive Strain

SiGe Si Si SiGe

Gate

Gate oxide

Horizontal pressure created by the uniaxial SiGe strain

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Ion, Ioff

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Ion, Ioff

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Transient Simulation

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P-channel MOS Summary

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Problem 2

• Design a Transmission Gate

• Draw a n-channel + p-channel MOS

• Add “Enable control”

• Simulate the analog switch

• Determine the cut-off frequency

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Interconnect n-diff and p-diff

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Transmission Gate

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Problem 3 – correct design

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Problem 3 – correct design

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Problem 4

• Design a MOS device suitable for Bluetooth output stage

• What ????

2. Inverter

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Problem 5

• Draw an Inverter (ch4 – pp 3)– Tune the design for symmetrical V/V curve– Delay performances when connected to 1,2, 3

inverters (fanout)

• Draw 3 inverters (ch4 – pp 35)– Try to have the fastest free oscillator

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V/V Static Curve

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Delay vs. Fanout

Delay

Fanout

0 1 2 3

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3. Basic analog cells

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Problem 6 – What is this ?

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Problem 7 – Draw a 10 K resistor

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Problem 8 – Generate a 0.6 V reference, 1µA max

• Use two diode-connected MOS

• Verify DC consumption by – “Voltages and

Currents”– I in log

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Problem 9 – From 1µA, generate 100µA

• Use the current mirror principle

• I(M2) = I(M1) if size identical

• For which Vout range do we have 100µA +/- 10% ?

Vout

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Problem 10 – Amplify with a gain of 10

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Problem 10 – Amplify with a gain of 10

Vout

Vin

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Problem 11 – OpAmp to compare two analog values

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4. Mini-Projects

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5V

0V

1.25V

2.5V

3.75V

Vin

A1

A0

C1

C0

C2

+

+

+

-

-

-Poly resistor

Amplifer used as comparator

Coding Logic

Analog - Digital Converters

5V

2.5V

3.125V

3.75V

4.375V

A0

0.625V

1.25V

1.875V

0V

nA0A1 nA1

Vout

A2 nA2

0

0

1

• 3-bit ?• R/2R ?• C/2C ?• Other type?

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Static Memory

• 4 x 4 ?• 8 x 8 ?• Emulate 256 x 256 ?• Split in 3 sub-projects?

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Other ideas

• Amplifier with programmable gain• Rail-to-rail amplifier• 1.9 GHz amplifier 1 Watt• 2.45 GHz amplifier with sub-sampling to 100 MHz• Phase Lock Loop

– Frequency multiplier

– FM receiver

Thank you for your attentionThank you for your attention