Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

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Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Ill. Chicago - CHEM - 112

Iowa State - EE - 435

EE 435Lecture 3 Spring 2009Design Space Exploration -with applications to single-stage amplifier design1Review from last lecture:What is an Operational Amplifier?Textbook Definition: Voltage Amplifier with Very Large Gain -Very High Input

Iowa State - EE - 435

EE 435Lecture 4 Fully Differential Single-Stage Amplifier Design1Review from last lecture:Parameter Domains for Characterizing Amplifier Performance{gm,g0}W ,IDQ L Degrees of Freedom: 2 Small signal parameter domain : -g g A v0 = m GB =

Iowa State - EE - 435

EE 435Lecture 6: Current Mirrors Signal Swing Telescopic Cascode Op Amp1Performance with Common-Mode InputConsider tail-current bias amplifierVDDVOUTCReview from last lecture:VBBVOUTCVCCLVcVXIBIAS/2V OUTC( sC+G1+G2 ) +GM1V1 = G

Iowa State - EE - 435

EE 435Lecture 7: High-Gain Single-Stage Op Amps1Review from last lecture:Signal SwingHow do the transfer characteristics relate to the signal swing ?ViNFor this circuit, high gain and large output signal swing for small VEB12Review f

Iowa State - EE - 435

EE 435Lecture 10: High-Gain Single-Stage Op Amps- Current-mirror op amps - OTA Applications1Textbook reference:Some of the material we have been discussing appears in Chapter 3, some in Chapter 5, and some in Chapter 6 of the Martin and Johns

Iowa State - EE - 435

EE 435Lecture 15 Compensation of Cascaded Amplifier StructuresReview from last lecture . Basic Two-Stage Op AmpBy inspection. gm1 gm5 Ao = g + g g + g o4 o5 o6 o2p1 = go1 + go5 gm5 CC g +g o6 05p2 =gm5 CLgm

Iowa State - EE - 435

EE 435Lecture 16CompensationReview from last lecture Review of Basic Concepts Consider a second-order factor of a denominator polynomial, P(s), P(s)=s2+a1s+a0 Then P(s) can be expressed in several alternative but equivalent ways0 + 2 0 Q s2 + s

Iowa State - EE - 435

EE 435Lecture 18 Systematic Two-Stage Op Amp DesignReview from last lectureNyquist and Gain-Phase PlotsNyquist and Gain-Phase Plots convey identical information but gain-phase plots often easier to work withMag70 60 50 40 30 20 10 0 -10 -20 -

Iowa State - EE - 435

EE 435Lecture 19 Two-Stage Op Amp with LHP Zero Loop Gain - Breaking the LoopReview from last lecture . Basic Two-Stage Op Amp7 Degrees of Freedom {P, , VEB1, VEB3, VEB5,VEB6, VEB7}. W W W W W 1 3 5 , 6 , 7 ,I , , , T L1 L3 L5

Iowa State - EE - 435

EE 435Lecture 21 Linearity in Operational Amplifiers - The differential pairsReview from last lecture . gmeq Enhancement with Driven Counterpart Circuitg +g A = g +gm1 o1 V0 m1 m3 o3g +g GB = CLm3. Both gain and GB enhancement

Iowa State - EE - 435

EE 435Lecture 24 Offset Voltages Common Centroid Layouts Data ConvertersReview from last lecture . Offset Voltage DistributionGaussian (Normal) pdf. Typical histogram of offset voltage (binned) after fabrication Mean is nearly 0 (actu

Iowa State - EE - 435

EE 435Lecture 26 Data ConvertersReview from last lecture . Common Centroid LayoutsAlmost Theorem: If p(x,y) varies linearly throughout a two-dimensional region, then pEQ=p(x0.y0) where x0,y0 is the geometric centroid to the region.Paramete

Iowa State - EE - 435

EE 435Lecture 30 Data ConvertersSpectral Performance. Review from last lecture . Spectral CharacterizationReview from last lecture . INL Often Not a Good Measure of LinearityFour identical INL with dramatically different lineari

Iowa State - EE - 435

EE 435Lecture 31 Spectral Performance Tool Use and ValidationReview from last lecture . Spectral AnalysisIf f(t) is periodicf(t) = A 0 + A k sin (k t + k )k =1alternatelyf(t) = A 0 + a k sin (k t ) + b k cos(k t )k =1 k =1

Iowa State - EE - 435

EE 435Lecture 34 DAC DesignR-String DAC Design Discussion of Pelgrom 10-Bit String DACReview from last lecture . R-String DACRFFR S1 R S2INnR SN-2 R SN-1OUT. RSNBasic R-String DACReview from last lecture . R-String

Iowa State - EE - 435

EE 435Lecture 37 DAC DesignR-2R DACs Current Steering DACs Charge Redistribution DACsCurrent Steering DACsII 2I 22I 23R-2R Resistor ArraysCurrent Steering DACsR-2R Resistor ArraysAnother R-2R DACAnother R-2R DACF OUT124

Iowa State - EE - 435

EE 435Lecture 41Voltage ReferencesReview from last lecture . Desired Properties of ReferencesBIAS REF Accurate Temperature Stable Time Stable Insensitive to VBIAS Low Output Impedance (voltage reference) Floating Small Area Low

Iowa State - EE - 435

EE 435 Lecture 44Switched-Capacitor Amplifiers Other Integrated FiltersSwitched-Capacitor AmplifiersNoninverting AmplifierC AV = 1 CInverting AmplifierAV = C1 C Accurate control of gain is possible (0.1% or better) but extreme care to de

Iowa State - EE - 435

EE 435 Homework 1 Spring 2009 Due Friday Jan 16Problem 1 Identify one operational amplifier that has been published in one of the following in the past 5 years: IEEE Journal of Solid State Circuits IEEE Trans. On Cirucits and Systems (Part 1 or Par

Iowa State - EE - 435

Iowa State - EE - 435

EE 435 Homework 3 Spring 2009 In the following problems, if reference to a semiconductor process is needed, assume processes with the following characteristics: CMOS Process - nCOX=100A/v2 ,pCOX=nCOX/3 ,VTNO=0.5V, VTPO= - 0.5V, COX=2fF/2, n= p= 0.01V

Iowa State - EE - 435

Homework Assignment EE 435 Homework 6 Spring 2009 Problem 1 An open-loop amplifier has a gain Ao and left-half plane poles at p1 and p2 where p2=kp1 If it is used as a feedback amplifier with a feedback factor , determine the pole ratio k so that the

Iowa State - EE - 435

Iowa State - EE - 435

%EE 435 Homework 7 %Problem 2 Ao = 1e4; %80 dB = 10000 p1 = 10; p2 = 1e4; n=1; for B = 0:0.01:1 D_FB = [1 (p1+p2) p1*p2*(1+Ao*B)]; poles(n,:) = roots(D_FB); n = n+1; end figure, plot(poles,'x-'),. title('Poles Locus Plot'), xlabel('Real Axis'), ylabe

Iowa State - EE - 435

EE 435 Assignment 9 Spring 2009Problem 1 a) Prove the following theorem. Theorem: If the INL of a DAC is less than LSB, then the DAC is monotone. b) The theorem of part a) was sufficient but not necessary. Give an example of a DAC that is monotone

Iowa State - EE - 435

EE 435 HW #9 solution Problem 1 (a) Proof: Vk+1-Vk = [(k+1)LSB+INLk+1]- (kLSB+INLk)=1LSB+INLk+1 - INLk > 1 LSB-| INLk+1|-| INLk| > 0 (b) ExampleProblem 2 12.1 of Johns and Martin Solution: The number of switches in the N-bit resistor-string DAC

Iowa State - EE - 435

EE 435 HW #9 solution for Problems 2, 4 and 6 Problem 2 12.1 of Johns and Martin Solution: The number of switches in the N-bit resistor-string DAC is: # of switches = 2*(1+2+2^2 2^ N1 2* 2^N1 N 1,2,3 Problem 4 If a 1024 p

Iowa State - EE - 435

Pelgrom Paper Assessment Most challenges and solutions are included in Lecture 35 of EE 435 as shown below. http:/class.ece.iastate.edu/ee435/lectures/EE%20435%20Lect%2035%20Spring%202009.pdf An example assessment from one of the students is also inc

Iowa State - EE - 435

1 EE 435 Final Exam Spring 2009 Name_Instructions: This is an open-book, open-notes exam but no collaboration with anyone except the course instructor is permitted. This exam is to be returned to Rm 2133 Coover by 12:00 noon on Thursday May 7. All

Iowa State - EE - 435

1 EE 435 Exam 1 Spring 2008 Name_Instructions: You may use up to 2 pages of notes for this exam. All work should be included on this exam attach additional pages only if more space is needed. There are 10 short questions worth 2 pts each. All prob

Iowa State - EE - 435

1 EE 435 Final Exam Spring 2006 Name_Instructions: This is an open-book, open-notes exam. All work should be included on this exam attach additional pages only if more space is needed. There are 10 short questions worth 2 pts each. All problems ar

Iowa State - EE - 435

EE435 Experiment 2: Amplifier Characterization Spring 2009Objective: The objective of this experiment is to develop measurementmethods for characterizing key properties of operational amplifiers1 IntroductionAmplifiers are one of the major compo

Iowa State - EE - 435

EE 435Lecture 4: Fully Differential Single-Stage Amplifier Design1Review from last lecture:Parameter Domains for Characterizing Amplifier Performance{gm,g0}W ,IDQ L Degrees of Freedom: 2 Small signal parameter domain : -g g A v0 = m GB

Iowa State - EE - 435

EE 435Lecture 7: High-Gain Single-Stage Op Amps1Review from last lecture:Signal SwingHow do the transfer characteristics relate to the signal swing ?ViNFor this circuit, high gain and large output signal swing for small VEB12Review f

Iowa State - EE - 435

Iowa State - EE - 435

EE 435 Lecture 11Other Gain Enhancement Strategies- Cascaded Amplifiers

Iowa State - EE - 435

EE 435Lecture 12 Cascaded Amplifier StructuresReview from last timeIncreasing Gain by CascadingProvided the stages are non-interactingXINA1A2XOUTX OUT = A 1A 2 X INX OUT = A 1A 2 A 3 X INn X OUT = Ai X IN i =1Gain can be easily

Iowa State - EE - 435

EE 435Lecture 15 Cascaded Amplifier Structures - the two-stage op ampReview from last lectureAnalysis of Internally Compensated TwoStage Op Amps gmF1 gmF2 A V0 = g + g g + g oP1 oF2 oP2 oF1p2 =(goF2 + goP2 )CLp1(goF1 + goP1