teaching staff...

6
1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction Lingkai Kong EECS 2 Who am I? Lingkai Kong Ph.D. in EECS, UC Berkeley, Dec. 2012. Currently a post-doc at BWRC Thesis: 60GHz Energy-Efficient Phased-Array Design for High Data-Rate Wireless Communications Research Interest Mixed-signal circuit and system design RF/Microwave circuit and system design Power circuit design Design Automation 3 Teaching Staff Lingkais office hours Location: TBA Tues. and Thurs. 11am-12pm (right after the class) konglk@eecs GSI: Yue Lu Weekly discussion session/office hours Time/location: TBA Most likely Fri. 10am-11am in 550 Cory yuelu@eecs 4 Administrative Course web page: http://bwrc.eecs.berkeley.edu/classes/icdesign/ee240_sp13 Lecture videos Will be posted on course website All announcements made through piazza Enroll in EE240 at: https://piazza.com/class#spring2013/ee240 5 Lecture Notes Based on material from Prof. Elad Alon, Prof. Bernhard Boser, Prof. Ali Niknejad, Simone Gambini, and myself Primary source of material for the class No required text – reference texts on next slide Notes posted on the web at least 1 hour before lecture 6 References Analysis and Design of Integrated Circuits, Paul R. Gray, Paul J. Hurst, Stephen H. Lewis, Robert G. Meyer, 4th Ed., Wiley, 2001. Design of Analog CMOS Integrated Circuits, Behzad Razavi, McGraw-Hill, 2000. The Design of CMOS Radio-Frequency Integrated Circuits, Thomas H. Lee, 2nd Ed., Cambridge University Press, 2003. The Art of Analog Layout, A. Hastings, Prentice Hall, 2005. The Designers Guide to SPICE & SPECTRE, K. S. Kundert, Kluwer Academic Press, 1995. Operation and Modeling of the MOS Transistor, Y. Tsividis, McGraw-Hill, 2nd Edition, 1999. Solid-State Circuits, Journey of

Upload: others

Post on 19-Apr-2020

2 views

Category:

Documents


0 download

TRANSCRIPT

Page 1: Teaching Staff Administrativebwrcs.eecs.berkeley.edu/Classes/icdesign/ee240_sp13/lectures/Lect… · 1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction

1

EECS240 – Spring 2013

Advanced Analog Integrated Circuits Lecture 1: Introduction

Lingkai Kong EECS

2

Who am I? •  Lingkai Kong •  Ph.D. in EECS, UC Berkeley, Dec. 2012.

•  Currently a post-doc at BWRC

•  Thesis: 60GHz Energy-Efficient Phased-Array Design for High Data-Rate Wireless Communications

•  Research Interest •  Mixed-signal circuit and system design •  RF/Microwave circuit and system design •  Power circuit design •  Design Automation

3

Teaching Staff •  Lingkai’s office hours

•  Location: TBA •  Tues. and Thurs. 11am-12pm (right after the class) •  konglk@eecs

•  GSI: Yue Lu •  Weekly discussion session/office hours •  Time/location: TBA

•  Most likely Fri. 10am-11am in 550 Cory •  yuelu@eecs

4

Administrative •  Course web page:

http://bwrc.eecs.berkeley.edu/classes/icdesign/ee240_sp13

•  Lecture videos •  Will be posted on course website

•  All announcements made through piazza •  Enroll in EE240 at:

https://piazza.com/class#spring2013/ee240

5

Lecture Notes •  Based on material from Prof. Elad Alon, Prof.

Bernhard Boser, Prof. Ali Niknejad, Simone Gambini, and myself

•  Primary source of material for the class •  No required text – reference texts on next slide

•  Notes posted on the web at least 1 hour before lecture

6

References •  Analysis and Design of Integrated Circuits,

Paul R. Gray, Paul J. Hurst, Stephen H. Lewis, Robert G. Meyer, 4th Ed., Wiley, 2001.

•  Design of Analog CMOS Integrated Circuits, Behzad Razavi, McGraw-Hill, 2000.

•  The Design of CMOS Radio-Frequency Integrated Circuits, Thomas H. Lee, 2nd Ed., Cambridge University Press, 2003.

•  The Art of Analog Layout, A. Hastings, Prentice Hall, 2005.

•  The Designers Guide to SPICE & SPECTRE, K. S. Kundert, Kluwer Academic Press, 1995.

•  Operation and Modeling of the MOS Transistor, Y. Tsividis, McGraw-Hill, 2nd Edition, 1999.

•  Solid-State Circuits, Journey of

Page 2: Teaching Staff Administrativebwrcs.eecs.berkeley.edu/Classes/icdesign/ee240_sp13/lectures/Lect… · 1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction

2

7

Grading •  Grading:

•  HW: 20% •  One HW roughly every two weeks •  Essential for learning the class material

•  Project: 25% •  Groups of 2 – find a partner ahead of time

•  Midterm: 20% •  Final Exam: 35%

8

Homework •  Homework:

•  Can discuss/work together •  But write-up must be individual •  Hand in during the class •  Electronic version encouraged •  Generally due 5pm on Thursdays

•  No late submissions in general •  Start early! •  Exceptions: Tape-out and etc., tell us ahead of

time

9

Simulation Tools •  Need to setup Spectre or equivalent

simulator •  HSPICE, ADS, BDA, SpectreRF, Eldo, or other

favorite tool •  Berkeley Analog Generator (BAG)

•  Python based analog design framework •  Design automation/scripting •  Design optimization •  Complete setup on instructional servers (t7400-*)

and BWRC servers •  See course website for tutorials •  Special discussion session for BAG (this Fri.)

10

Schedule Notes •  ISSCC Week: 2/17 – 2/21 (no lectures) •  Spring break: 3/25 – 3/29 •  Midterm: March 14 (tentative) •  Project:

•  Part 1 due middle of Apr. •  Part 2 due end of Apr. •  Part 3 due May 9th(tentative)

•  Final: Wed., May 15, 11:30am-2:30pm

Why Analog IC?

12

“Analog ICs in a Digital World?” Digital circuitry: •  Cost/function

decreases by 29% each year

•  30X in 10 years

Analog circuitry: •  Cost/function may not scale very well •  Common complaints about scaling analog:

•  Supply voltage is too low, device gain is low, horrible matching…

“Analog will die – everything will be digital!” •  Who agrees?

0.00000010.0000001

0.0000010.000001

0.000010.00001

0.00010.0001

0.0010.001

0.010.01

0.10.111

19821982 19851985 19881988 19911991 19941994 19971997 20002000 20032003 20062006 20092009 20122012

cost: cost: ¢¢--perper--transistortransistor

Fabrication cost per transistor

0.00000010.0000001

0.0000010.000001

0.000010.00001

0.00010.0001

0.0010.001

0.010.01

0.10.111

19821982 19851985 19881988 19911991 19941994 19971997 20002000 20032003 20062006 20092009 20122012

cost: cost: ¢¢--perper--transistortransistor

Fabrication cost per transistor

Page 3: Teaching Staff Administrativebwrcs.eecs.berkeley.edu/Classes/icdesign/ee240_sp13/lectures/Lect… · 1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction

3

13

(Good) Digital Design Needs Analog Insights •  Can synthesize large blocks at “medium”

frequencies in ASIC flow, but •  Need to know transistors to design the cells •  Really need to know transistors to design memories

•  Lots of analog issues to deal with when push digital performance, power, etc. •  Charge sharing, interconnect parasitics, etc.

•  Matching growing concern in advanced CMOS technologies •  Especially in memories

14

Another Example

•  Look at interface between two digital chips •  Is received bit a

“1” or a “0”?

•  Analog circuits critical for receiving bits correctly

TX RX

Initial eye

15

The More Fundamental Reason •  The “real” or “physical” world is analog

•  Analog is required to interface to just about anything

•  Digital signals have analog characteristics too… •  “If you look close enough, all the digital signals are

analog” •  In many applications, analog is in the critical path

•  Examples: •  Wireline, optical communications •  RF transceivers (receiver + transmitter) •  Sensors and actuators (e.g., MEMS)

16

RF Receiver

•  Why so many RF and analog building blocks?

•  Why not just put the ADC right after the antenna?

17

Software Defined Radio

18

RF Transceiver Layout

•  Analog building blocks take up significant die area •  Even in 0.13um…

Source: Zagari et al, “A Dual-Band CMOS MIMO Radio SoC for IEEE 802.11n Wireless LAN”, JSSC Dec. 2008"

Page 4: Teaching Staff Administrativebwrcs.eecs.berkeley.edu/Classes/icdesign/ee240_sp13/lectures/Lect… · 1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction

4

19

Capacitive Touch Sensor

20

MEMS Accelerometer

DSP"

A/D Conversion"

Amplification"

C/V conversion"

MEMS "sensor"

Acceleration"

Digital Output"

M. Lemkin and B. E. Boser, “A Three-Axis Micromachined Accelerometer with a CMOS Position-Sense Interface and Digital Offset-Trim Electronics,” IEEE J. Solid-State Circuits, vol. SC-34, pp. 456-468, April 1999

Analog Design versus Others

22

Analog versus Digital Design •  Abstraction in digital is Boolean logic (1’s, 0’s)

•  Works because of noise margins •  At a higher level, it’s gates and registers (RTL) •  Digital layout is often automated

•  Abstraction in analog is the device model •  (BSIM is a few thousand lines long)

•  At a higher level, it’s the (opamps) (filters) (comparators) •  Abstraction depends on the problem you’re solving

•  Analog layout is usually hand crafted •  Is there a way to automate analog layout?

23

Analog versus RF Design •  RF = “Analog with inductors” •  RF signal is usually narrowband (i.e., sinusoidal)

•  Tuned circuit techniques used for signal processing.

•  RF impedance levels are relatively low •  Can’t make transmission line impedance too high

•  Analog impedances are high (low) for voltage (current) gain. •  Voltage/current gain versus power gain.

•  “Mixed-signal” analog is often discrete time (sampled).

24

RF Shifting Toward Analog

•  Classic RF uses inductors to tune the circuits •  Inductors are big – would be nice to get rid of them

•  With increasing fT , moving towards wideband analog & feedback •  What’s the penalty?

Page 5: Teaching Staff Administrativebwrcs.eecs.berkeley.edu/Classes/icdesign/ee240_sp13/lectures/Lect… · 1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction

5

25

Mixed-Signal Design

•  Many building blocks involve analog and digital circuit co-design •  PLLs, ADCs, etc.

•  Sometimes hard to even distinguish between analog and digital •  Is VCO analog, or digital?

Clk

PFD RegulatorVcp

Vreg

up

down

÷N

Ref_clk+

-

26

Digitally-Assisted Analog

•  In 90nm, one RF inductor (200µ× 200µ) takes same area as a microprocessor! •  Leverage digital processing to improve analog circuits

•  Good analog design doesn’t go away though •  Need to find right partitioning to maximize the benefit

Source: B. Murmann, “Digitally-Assisted Analog Circuits – A Motivational Overview,” ISSCC 2007."

Contents of This Class

28

Syllabus •  Devices (both passive and active):

•  Models, simulation, layout, and matching •  Electronic noise •  Basic support functions:

•  Current sources, references, biasing •  Basic analog “gate”: amplifier

•  Opamps, OTAs, feedback, settling time, common-mode feedback

•  Application driver •  Motivates additional building blocks •  As well as why you care about certain specs

•  Data converters, comparators, offset cancellation, filters, sample & hold, oscillators, PLLs

29

Course Focus •  Focus is on analog design

•  Typically: Specs circuit topology layout

•  Spec-driven approach

•  Where specs come from

•  Key point: •  Especially in analog, some things are much

“easier” to do than others •  Sometimes (often) the right thing to do is

change the specs 30

Course Goal •  Learn how to create systematic approaches

to analog design •  Based on fundamental principles •  For a wide variety of applications

•  Will show specific design methodology example •  OTA designs embedded in ADCs

•  And then move on to a more complex system

Page 6: Teaching Staff Administrativebwrcs.eecs.berkeley.edu/Classes/icdesign/ee240_sp13/lectures/Lect… · 1 EECS240 – Spring 2013 Advanced Analog Integrated Circuits Lecture 1: Introduction

6

31

EECS 240 versus 247 •  EECS 240

•  Transistor level building blocks •  Device and circuit fundamentals •  A lot of the class at a low level of abstraction

•  SPICE

•  EECS 247 •  Macro-models, behavioral simulation, large

systems •  Signal processing fundamentals •  High level of abstraction •  Matlab

32

240 versus 242/142 •  142/242 mostly concerned with narrowband

circuits operating at a “high” carrier frequency •  Signals mostly look like sinusoids •  Inductors ubiquitous •  Use of feedback is rare

•  240 focuses on more “wideband”, general-purpose analog and mixed-signal •  Signals are “arbitrary” •  Spend a lot of time worrying about capacitance •  Feedback common

33

240 versus 231 •  231 concentrates on device physics

•  240: device physics abstracted to the extent possible •  Device models from a “circuit designer’s perspective” •  Treat transistor as black box described by complex

equations •  Equations relevant for biasing, nonlinear effects

(output swing), and some charge storage effects •  Mostly outside design loop •  “small signal analysis”