Nov 9, 2009

Op-Amp design from Circuit sage

Op-Amp Design
The op-amp is the workhorse of analog IC design. It has been studied extensively by IC designers from all over the world for over 30 years now. Today, new topologies and techniques are being investigated to deal with the ever-shrinking supply voltages of newer SoC's (Systems on Chip) fabri...
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The op-amp is the workhorse of analog IC design. It has been studied extensively by IC designers from all over the world for over 30 years now. Today, new topologies and techniques are being investigated to deal with the ever-shrinking supply voltages of newer SoC's (Systems on Chip) fabricated in the 130, 90, 65, and even 45 nanometers CMOS process nodes. Most circuits in these SoC's need to run from 1.2 Volts or lower supply voltages. Although low-Vth devices can be used in a pinch, they add to the cost of fabrication and therefore should be avoided. In addition, consumers' insatiable appetite for higher data rates and bandwidth in wireless communications puts pressure on IC designers everywhere to design faster and faster (but still very stable) analog circuits, just about all of which utilize an op-amp or three somewhere. Of course, consumers also want their wireless handhelds to go on for as long as possible without recharging, which means analog designers always need to be very keen on the power consumption of their blocks. Every micro-amp counts.
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ToolsArticlesBooks
Circuit Sage Tools
Optimal Vdsat for Folded Cascode Opamps:Mathcad worksheet calculates optimal vdsat of folded cascode current sources
Optimal Phase Margin of second order systems:Mathcad worksheet calculates optimal phase margin for 2nd order systems
Online Tools
Op-amp design using Mathcad:How to use Mathcad to optimize your two-stage op-amp
PSpice 9.1 and 10.0 at the University of Catania in Italy:Do you miss it? I do. Libraries for bipolar and CMOS processes can be downloaded as well.
Online Articles
Detailed analysis of gain-boosted cascode amplifier paper from U. of Catania in Italy:Very good. Analyzes this topology in detail in both time and frequency domains, verifies in 0.35-micron CMOS.
High-gain op-amp compensation techniques thesis from BYU:Presents high-gain op-amp topologies and feedforward compensation technique as an alternative to the pole-splitting technique. Demonstrates in 0.25-micron CMOS (TSMC)
How to send Cadence output to MATLAB for post-processing:If you have a small data set (a few hundred points) then use the "printvs" button in the Cadence calculator. For thousands of points you'd better use ocean (unless you are in the mood to wait a loooong time for your text file)
Good techniques for analog IC layout handout from Colorado State:Techniques for good matching and reliability, including common-centroid arrangement and guard rings
Citeseer:Great research tool, tons of articles
Op-amp lectures from Professor Sansen:Scroll down. Various presentations on op-amp topologies and design techniques.
Design of High Speed Op-amps presentation from Boise State:Biasing and compensation techniques for high-speed op-amps in 50-nm CMOS
Improvements in biasing and compensation of CMOS op-amps: paper from U. of Toronto:Adds a high impedance node to constant-gm bias circuit for more efficient (less area) op-amp compensation, presents compensation technique for more consistent phase margin over temparature and process variations
OTA's for gm-C filters presentation from TAMU:Very good tutorial on how to design OTA's for gm-C filters between 0.1-Hz and 2.0GHz
Advanced Analog IC Design lecture notes from Texas A&M:Rail-to-rail amplifiers, OTA's, switched-cap, CMFB, low-voltage techniques, and other topics
Overshoot as a function of Phase Margin article from U. of Rhose Island:Percentage overshoot versus Phase Margin of a closed-loop circuit using a two-pole op-amp
High performance current mirrors lecture handout from Georgia Tech:Wide-swing and regulated cascode current mirrors for higher performance
MOS op-amp lecture handout from Georgia Tech:Folded-load MOS op-amps, linearisation and higher slew rate techniques
Cascode op-amps lecture handout from Georgia Tech:Cascode and folded cascode MOS op-amps
Buffered op-amps lecture handout from Georgia Tech:Buffer stages topologies
Feedback lectures from Professor Phillip Allen at Georgia Tech:Lectures 250 through 290. Feedback topologies in op-amp circuits.
Comparators lecture handouts from Georgia Tech:Lectures 360-410. Analysis of MOS comparators
Advanced op-amps lecture handouts from Georgia Tech:Lectures 310-350. Low-power, low-voltage, high-speed opamp topologies
Op-amp frequency response and compensation lecture handouts from Georgia Tech:Lectures 70-130
Two-stage MOS op-amp design lecture notes from Georgia Tech:Design procedure for two-stage CMOS op-amp
Op-amp CMRR measurement setup paper from UT-Dallas:Analyzes measurement setups for op-amp CMRR, proposes new setup
Op-amp with high-current, class-AB output stage: paper from UT-Dallas:Class AB output stage has 100 mA output current drive capability with 1.5 mA quiescent current.
Op-amps for cell phone speakers presentation from UT-Dallas:Requirements of cell phone speaker drivers and evaluation of circuit topologies for the task
Sizing CMOS op-amp transistors presentation from UT-Dallas:Design of 2-stage and folded-cascode CMOS op-amps
Design of low-offset CMOS op-amps presentation from UT-Dallas:Analysis of issues that affect the offset voltage in a CMOS op-amp
CMOS op-amp lecture notes from Phillip Allen:Very good lectures, basic and advanced topologies, detailed analysis.
1968 app note from Widlar shows cool op-amp topologies:Oscillators, comparators, level shifters, multipliers, root extractors (!) and other functions that can be performed using op-amps.
Feedback Amplifiers and Oscillators presentation from U. of New Brunswick:Nice, shows various feedback topologies and identifies feedback topologies of practical circuit configurations
MOS Op-amp tutorial from Gray and Meyer:Two-stage CMOS op-amp tutorial plus more elaborate topologies and output stages
Geometric programming of CMOS op-amps Stanford paper:Automatic optimization of CMOS op-amps given a set of performance targets
Analysis of non-linearities in CMFB circuit paper from UC - Davis :Analyzes the effects of non-linearities in CMFB circuits, proposes use of degeneration resistors to reduce them
Paper from UC - Davis analyses techniques to cancel the RHP zero in 2-stage fully differential CMOS op-amps:Analyzes and compares 4 current buffer compensation schemes for fully differential CMOS op-amps.
Paper from UC - Davis analyzes how to determine stability in fully differential circuits using method of return ratios:Presents SPICE techniques to obtain the return ratios of differential and CM feedback loops as well as techniques to determine stability.
Cascode OTA for microwave applications paper from Queen's University in Ontario:Presents 11-mA/V gm-cell that has 10-GHz bandwidth, uses it to implement a 2.9-GHz inductor-less oscillator by creating an active inductor with the gm cell. Implemented in 0.18-micron CMOS.
TRANSIMPEDANCE AMPLIFIERS (TIAS)
Transimpedance amplifiers and flip-flops for 40 GB/s links:TIA's implemented in 90-nm and 65-nm CMOS optimized for low power
CMOS Optical Pre-Amplifier for Wireless Infrared Communications: paper from U. of Toronto:A fully-differential, variable-gain transimpedance amplifier in 0.35-um CMOS
TIA for voltage-scalable short-distance optical link paper from Harvard:TIA implemented in 0.13-micron that works from 0.7V (lower bit rate) to 1.2V (higher bit rate) in order to minimize power dissipation
40 Gb/s TIA in 0.18-um CMOS paper from NTHU in Taiwan:Presents pi-type inductive peaking (PIP) inter-stage matching topology to resonate with NMOS intrinsic capacitances in a 4-stage TIA. Demonstrated in 0.18-um CMOS, circuit draws 33 mA from 1.8-V and has 30-GHz BW.
VARIABLE GAIN AMPLIFIERS (VGAS)
2-GHz PGA paper from U. of Stuttgart in Germany:51-dB of dynamic range with 3-dB gain control steps. Implemented in 0.12-micron CMOS.
CMOS PGA in .35-microns: paper from National Chiao-Tung University in Taiwan:High linearity using input switched resistors.
Low power CMOS VGA for disk drive read channels paper from U. of Minnesota:Often-cited paper presents an exponential gain versus control voltage transfer function using CMOS
Switched-capacitor VGA:0-24 dB gain range, implemented in 0.25-um CMOS
83-dB gain range VGA paper from ICU in Korea:Controls gain by changing the body voltage of a PMOS device. Demonstrates in 0.18-micron CMOS.
Reconfigurable digitally controlled VGA paper from ICU Korea:Achieves 42 dB of dB-linear range in a single stage by reconfiguring VGA using switches. Demonstrates in 0.18 micron CMOS.
CMOS RF VGA for mobile DTV tuners: paper from TAMU:Works at 400-900 MHz, 1-dB gain steps, 33-dB range, 16-dB max gain, fabricated in 0.18-um CMOS
2.2-GHz BW, inductor-less VGA paper from UC-Berkeley:VGA with 2.2-GHz 3-dB BW implemented in 90-nm CMOS uses no inductors and employs a dual feedback path for DC-offset correction. Has 60-dB of gain tuning range.
Books
Design of Analog CMOS Integrated Circuits by Behzad Razavi:One word: indispensable.
CMOS Analog Circuit Design by Allen and Holberg:Great resource
Analysis and Design of Analog Integrated Circuits by Gray and Meyer:Essential
Analog Integrated Circuit Design by Johns and Martin:Great resource
CMOS Circuit Design, Layout, and Simulation, Revised Second Edition by Jacob Baker:Great reviews on Amazon
The Art of Analog Layout by Alan Hastings:Highly regarded
Design with Operational Amplifiers and Analog Integrated Circuits by Sergio Franco:Many op-amp topologies
Mead courses:Many courses in USA and overseas
1-week op-amp course by Phillip Allen, $1800:Retired professor emeritus at Georgia Tech

Aug 14, 2009

Online Books

Online Books from EDACafe

http://www10.edacafe.com/aws/book_list.php?subject_id=3040



Application-Specific Integrated Circuits (ASICs... the book)
by Michael John Sebastian Smith, Published 06/1997 - COMPLETE BOOK

Bit-Slice Design: Controllers and ALUs
by Donnamaie E. White, Published 07/2001

Logic Design for Array-Based Circuits
by Donnamaie E. White, Published 05/2001

Power, accuracy and noise aspects in CMOS mixed-signal design
by Sanduleanu, Mihai Adrian Tiberiu, Published 06/2004

Verification Methodology Manual, 3rd Edition
by David Dempster and Michael Stuart, Published 06/2004

Jul 22, 2009

The Designer's Guide - Analog

The Designer's Guide


A source of in-depth information about the art of circuit simulation and modeling for analog, RF, and mixed-signal designers.


http://www.designers-guide.org/

Jun 8, 2009

Trolling for gold in the BlackBerry Bold

Trolling for gold in the BlackBerry BoldResearch In Motion's BlackBerry Bold gets a tech inspection courtesty of an EDN partnership with phoneWreck.

http://www.edn.com/article/CA6659415.html

Jun 7, 2009

VLSI & Signal Processing Conferences

VLSI & Signal Processing Conferences

http://www.ece.ucdavis.edu/vcl/misc/conferences.html

Respect the Unstable - G. Stein

G. Stein, “Respect the unstable,” IEEE Control Systems Magazine, vol. 23, no. 4, Aug. 2003, pp. 12 – 25.

http://flyingv.ucsd.edu/krstic/teaching/143b/GSBode.pdf

Jun 2, 2009

Middlebrook’s Structured Analog Design Course

Middlebrook’s New Structured Analog Design Course


DESIGN-ORIENTED ANALYSIS RULES AND TOOLS

http://www.rdmiddlebrook.com/D_OA_Rules&Tools/index.asp



Downloadable Files of D-OA Rules & Tools:
Ch 01.Motivation & Background.pdf
Ch 01A.FETs & BJTs are CCDs.pdf
Ch 02.Low Entropy Expressions.pdf
Ch 03.Normal & Inverted Poles & Zeros.pdf
Ch 04.Improved Formula for Quadratic Roots.pdf
Ch 05.Approximations & Assumptions.pdf
Ch 06.Products & Sums of Factored P-Z Expressions.pdf
Ch 07.The IO IT.pdf
Ch 08.NDI & EET.pdf
Ch 09.DT & CT.pdf
Ch 10.Basic Feedback.pdf
Ch 11.NDI & GFT.pdf
Ch 12.DNTI & 2EET.pdf
Ch 13.DNTI & 2GFT.pdf
Ch 14.2CE Feedback Amp.pdf
Ch 15.Realistic IC Feedback Amp.pdf
Ch 16.Darlington Follower Instability.pdf
Ch 17.Input Filter Problem.pdf
Ch.18.CurrProgSwReg.pdf
Glossary.pdf
NDI,Nullor,GFT Template.pdf

[1] R.D.Middlebrook, "Design-Oriented Analysis of Feedback Amplifiers," Proc. National Electronics Conference, vol. 20, Oct. 1964; pp. 234-238.
[2] R.D.Middlebrook, "Measurement of Loop Gain in Feedback Systems," Intl. J. of Electronics, vol. 38, Apr. 1975; pp. 485-512.
[3] R.D.Middlebrook, "Null Double Injection and the Extra Element Theorem," IEEE Trans. on Education, vol. 32, no. 3, Aug. 1989; pp. 167-180.
[4] R.D.Middlebrook, "The Two Extra Element Theorem," Proc. IEEE Frontiers in Education, 21st Annual Conf., Purdue Univ., Sept. 21-24, 1992; pp. 702-708.
[5] R.D.Middlebrook, Vatché Vorpérian, and John Lindal, "The N Extra Element Theorem," IEEE Trans. on Circuits and Systems, vol. 45, no. 9, Sept. 1998.; pp. 919-935.
[6] Vatché Vorpérian, Fast Analytical Techniques for Electrical and Electronic Circuits,, Cambridge Univ. Press, 2002.

May 26, 2009

Berkeley 240, 001 - Advanced Analog Integrated Circuits

Electrical Engineering 240, 001 - Advanced Analog Integrated CircuitsTTh 9:30-11 203 MCLAUGHLIN

Lectures

http://bwrc.eecs.berkeley.edu/classes/icdesign/ee240_s09/

Videos

http://webcast.berkeley.edu/course_details_new.php?seriesid=2009-B-25830&semesterid=2009-B


Lecture 1: Introduction

Lecture 2: CMOS Technology and Passive Devices

Lecture 3: MOS Models for Analog Design - with audio


Lecture 3: MOS Models for Analog Design - Lecture has no audio. Has been reposted above


Lecture 4: MOS Small-Signal Models for Design

Lecture 5: Electronic Noise

Lecture 6: Noise Analysis

Lecture 7: Noise and Feedback

Lecture 8: Current Sources

Lecture 9: Amplifiers

Lecture 10: Single-Ended and Differential OTAs

Lecture 11: Folded Cascode OTA

Lecture 12: Feedback I

Lecture 13: Feedback II

Lecture 14: Settling Time

Lecture 15: Design Example and Common-Mode Feedback

Lecture 16: Multistage Amplifiers

Lecture 16b: Multistage Amplifiers II

Lecture 17: High-Speed Link Overview Lecture ran overtime. Last 4 minutes are not available.

Lecture 18: High-Speed Filter Design

Lecture 18b: High-Speed Filter Design II

Lecture 19: Comparators

Lecture 20: Matching and Layout

Lecture 21: Offset Cancellation

Lecture 21b: Offset Cancellation II

Lecture 22: MOS Sample and Hold

Lecture 23: Biasing and References


http://webcast.berkeley.edu/course_details_new.php?seriesid=2009-B-25830&semesterid=2009-B

Integrated Circuits for Commuincation - EECS 142 Berkeley

Integrated Circuits for Commuincation - EECS 142 Berkeley


http://rfic.eecs.berkeley.edu/~niknejad/ee142/lectures.html

ELEN 607 Analog Circuit Techniques

ELEN 607 Analog Circuit Techniques

Texas A&M

Low Dropout Voltage Regulators - Tutorial

Low Dropout Voltage Regulators - Tutorial, Texas A&M


http://amesp02.tamu.edu/~sanchez/607%20Lect%2012%20LDO.ppt

Many good links at http://careervlsi.blogspot.com/

Many good links at http://careervlsi.blogspot.com/

RFICDESIGN.COM Links

RFICDESIGN.COM Links

Very Elaborate and Useful

http://www.rficdesign.com/links/

FREE BOOKS

http://rficdesign.com/links/books.htm

ASIC Complete BOOK:

Application-Specific Integrated Circuits

Op Amps for Everyone - Book from TI

Op Amps for Everyone - Book from TI


Ron Mancini


http://sreenivasa.kothamasu.googlepages.com/Opamp_Everyone.pdf

May 17, 2009

MITOPENCOURSEWARE - RF High Speed Communication Circuits 6.776

RF High Speed Communication Circuits 6.776

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-776Spring-2005/CourseHome/index.htm

Also

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-976High-Speed-Communication-Circuits-and-SystemsSpring2003/CourseHome/index.htm

MITOPENCOURSEWARE - Power Electronics

6.334 Power Electronics

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-334Spring-2007/CourseHome/index.htm

MITOPENCOURSEWARE - Microelectronic Devices and Circuits 6.012

Microelectronic Devices and Circuits 6.012 Fall 2003

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-012Fall2003/LectureNotes/index.htm

Microelectronic Devices and Circuits 6.012 Fall 2005

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-012Fall-2005/CourseHome/index.htm

MITOPENCOURSEWARE - Circuits and Electronics 6.002

6.002 Circuits and Electronics

http://ocw.mit.edu/OcwWeb/Electrical-Engineering-and-Computer-Science/6-002Spring-2007/CourseHome/index.htm

Circuits and Electronics


LEC #
TOPICS
1
Introduction and lumped abstraction
2 Basic circuit analysis method (KVL and KCL mMethod)
3 Superposition, Thévenin and Norton
4 The digital abstraction
5 Inside the digital gate
6 Nonlinear analysis
7 Incremental analysis
8 Dependent sources and amplifiers
9 MOSFET amplifier large signal analysis - part 1MOSFET amplifier large signal analysis - part 2
10 Amplifiers - small signal model
11 Small signal circuits
12 Capacitors and first-order systems
13 Digital circuit speed
14 State and memory
15 Second-order systems - part 1Second-order systems - part 2
16 Sinusoidal steady state
17 The impedance model
18 Filters
19 The operational amplifier abstraction
20 Operational amplifier circuits
21 Op amps positive feedback
22 Energy and power
23 Energy, CMOS
24 Power conversion circuits and diodes
25 Violating the abstraction barrier

Power Conversion Synthesis Part 1: Buck Converter Design

Power Conversion Synthesis Part 1: Buck Converter Design

By Ernest H. Wittenbreder, Jr., Technical Witts Inc., Flagstaff, Ariz.


http://powerelectronics.com/mag/Wittenbreder%20March%202003%20PET.pdf

Buck-Converter Design Demystified

Buck-Converter Design Demystified

By Donald Schelle and Jorge Castorena, Technical Staff, Maxim Integrated Products, Sunnyvale, Calif.

From Power Electronics Technology

http://powerelectronics.com/mag/606PET25.pdf

Texas Instruments Analog Applications Journal

Texas Instruments Analog Applications Journal


For plethora of application notes on Analog and Power Management ........ Must read ......

Tutorial Papers on Analog Circuits

From University of Toranto (Some Links not working)



Aichin Chung LC oscillators: Theory and Design
Tony Pialis Low voltage, low power op amp design
Altan Hazneci Current feedback Amps
Paul Westergaard CMOS LNA's
Marcus van Ierssel Oscillator phase noise and jitter
Behnam Mohammadi Modeling of Silicon-compatible On-chip Inductors
Donny Mota Fully-Differential Op Amps and Common Mode Feedback Circuit Design
Robert Przyslupski Frequency regenerative dividers
Dennis Ma RF Receiver Systems and Circuits
Sotoudeh Hamedi-Hagh Power reduction techniques in pipelined A/D converters
Stephen Yue RF mixer circuit Linearization Techniques
Jorge Varona Power DACs using Sigma-Delta and PW modulation
Louie Pylarinos Charge Pump Circuits
Chetan Mistry Polymer Circuits
Raymond Tang Fiber Optic Preamplifiers
Natalie Wong CMOS Integrated Photodiodes and Transimpedance Amplifiers


AGC circuits: Theory and design Isaac Martinez G.
Basic and advanced current references Afshin Haftbaradaran
Automated Analog Circuit Design Navid AziziUsing Genetic AlgorithmsProgrammable Analog Circuits Vincent Law
Modeling and practical Agnes Tamconsiderations for integrated capacitors
Modeling of Substrate Noise Coupling Vincent Mui
Phase noise of oscillators Fang Fang
VCO circuits Jeff Wilkin
Low Power sense amplifiers Igor Arsovski
SOI vs CMOS analog circuits Vivian Ma
RF Power Amplifiers Alan Poon
Optoelectronic Integrated Circuits Shahla Honarkhahusing Porous Silicon
On-chip image rejection Nora Yantechniques for RF receivers
CMOS vs. charge-coupled device Imagers Kevin Ng
Low Power/Low Voltage CMOS Bandgap Tim Loreferences
Mismatch effects on Bandpass delta-sigma Farshid Rezaeimodulators
Laser Drivers Circuits Ricardo Aroca
IQ phase generation circuits HongFeng Dong
Chopper-Stabilized Amplifiers Yiqian Ying
RF Transmitter circuits Raymond Koo
Phase Interpolating Circuits Kostas Pagiamtzis
Sample and Hold Circuits Joyce Wong
Low-Power RF mixer circuits Mohammed El Kawokgy
Low-Power comparators Samira Naraghi
Distortion analysis of a LNA Su Tarn Lim

May 16, 2009

How to design a DC-DC Control Loop?

How to design a DC-DC Control Loop?

http://yourcircuits.com/inc/sdetail/3536

Details:
Designing the compensation network in a DC/DC converter can be a mystery if one does not know where to place the poles and zeros of the error amplifier and how much gain the error amp needs. Normally, a lot of trial and error is used to try to stabilize the control loop of a DC/DC converter. Here's a systematic approach to getting the job done.

From the website : www.YourCircuits.com

All About Circuits

All About Circuits

http://www.allaboutcircuits.com/


Volumes:
Volume I - DC
Basic Concepts of Electricity, OHM's Law, Electrical Safety, Scientific Notation...
Volume II - AC
Basic AC Theory, Complex Numbers, Reactance and Impedance, Resonance...
Volume III - Semiconductors
Amplifiers and Active Devices, Solid-State Device Theory, Diodes and Rectifiers...
Volume IV - Digital
Numeration Systems, Binary Arithmetic, Logic Gates, Switches...
Volume V - Reference
Conversion Factors, Resistor Color Codes, Math References, Periodic Table...
Volume VI - Experiments
Test Equipment, DC Circuits, AC Circuits, Discrete Semiconductor Circuits...

IIT Bombay NEPTEL Online VLSI Design course

IIT Bombay NEPTEL Online VLSI Design course

http://www.cdeep.iitb.ac.in/nptel/Electrical%20&%20Comm%20Engg/VLSI%20Design/TOC.htm



Lecture 1 : Motivation of the Course



Lecture 2 : What is System?


II
MOSFET


III
Fabrication Process and Layout Design Rules


IV
Propagation Delays in MOS


V
Power Disipation in CMOS Circuits


VI
Semiconductor Memories


VII
I/O PADs