EE 435. Lecture 3 Spring Design Space Exploration --with applications to single-stage amplifier design

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1 EE 435 ecture 3 Spring 2019 Design Space Exploration --with applications to single-stage amplifier design 1

2 Review from last lecture: Single-ended Op Amp Inverting Amplifier V IN R 1 V 1 R 2 A V V OUT V = -A V -V +V O 1 XQ YQ R R V = V + V O IN R 1+R2 R 1+R2 V OUT Summary: V YQ R R V = - V + V + V -V 2 2 O iss XQ XQ inq R1 R1 Slope = -A V XQ V IN What type of circuits have the transfer characteristic shown? 2

3 Review from last lecture: Single-stage single-input low-gain op amp V IN V 1 G M V 1 G C V OUT -G A M v = sc +G A = v0 -G G M G BW = C A V G G G GB = = G C C M M GB and A VO are two of the most important parameters in an op amp 3

4 Review from last lecture: How do we design an amplifier with a given architecture in general or this architecture in particular? What is the design space? V in V DD I DQ V SS M 1 C V OUT Generally V SS, V DD,C (and possibly V OUTQ )will be fixed Must determine { W 1, 1,I DQ and V INQ } Thus there are 4 design variables But W 1 and 1 appear as a ratio in almost all performance characteristics of interest and I DQ is related to V INQ, W 1 and 1 (this is a constraint) Thus the design space generally has only two independent variables or two degrees of freedom W 1 1 Thus design or synthesis with this architecture involves exploring the two-dimensional design space 4 W 1,I DQ 1,I DQ

5 Review from last lecture: Parameter Domains for Characterizing Amplifier Performance Degrees of Freedom: 2 Small signal parameter domain : -g A = m gm g v0 Natural design parameter domain: 0 W 2μCOX A V0= λ IDQ GB = GB = C {g m,g 0 } W,IDQ 2μCOX W IDQ C Process Dependent Architecture Dependent Process Dependent Architecture Dependent 5

6 Parameter Domains for Characterizing Amplifier Performance Degrees of Freedom: 2 Small signal parameter domain : -gm gm A v0 = g 0 Natural design parameter domain: W 2μCOX A V0= λ IDQ Alternate parameter domain: GB = C {g m,g 0 } GB = W,IDQ 2μC W OX IDQ C P,V EB P=power=V DD I DQ V EB =excess bias =V GSQ -V T g 2I 1 2 A V0 = = = g V λi λv M DQ 0 EB DQ EB gm 2IDQ 1 2 P GB = = = C V C V C V EB DD EB 6

7 Parameter Domains for Characterizing Amplifier Performance Degrees of Freedom: 2 Small signal parameter domain : -g g m m A v0 = g 0 Natural design parameter domain: W 2μCOX A V0= λ IDQ GB = C {g m,g 0 } W,IDQ Alternate parameter domain: A = V0 2 1 λ V EB GB = 2μC W OX IDQ C 2 P GB= V DD C V EB P,V EB Process Dependent 7

8 Parameter Domains for Characterizing Amplifier Performance Degrees of Freedom: 2 Small signal parameter domain : -g A = m gm g Natural design parameter domain: A v0 VO 2 C OX W I DQ Alternate parameter domain: A = V0 0 EB GB GB = C {g m,g 0 } 2C C OX W P λ V GB= V DD C V EB I DQ W,IDQ P,V EB Architecture Dependent 8

9 Parameter Domains for Characterizing Amplifier Performance Degrees of Freedom: 2 Small signal parameter domain : -g A = m gm g v0 Natural design parameter domain: A VO 2 C OX W I DQ Alternate parameter domain: A = V0 0 EB GB = C {g m,g 0 } GB 2C Alternate parameter domain gives considerable insight into design Easy to map from alternate parameter domain to natural parameter domain Alternate parameter domain provides modest parameter decoupling λ A and VDDC figures of merit for comparing architectures V0 2 GB 2 C OX W P λ V GB= V DD C V EB I DQ W,IDQ P,V EB 9

10 Parameter Domains for Characterizing Amplifier Performance Design often easier if approached in the alternate parameter domain How does one really get the design done, though? That is, how does one get back from the alternate parameter domain to the natural parameter domain? Alternate parameter domain: P,V EB V DD V in V SS I DQ M 1 C V OUT W =? =? I DQ =? V INQ =? 10

11 Parameter Domains for Characterizing Amplifier Performance Design often easier if approached in the alternate parameter domain How does one really get the design done, though? That is, how does one get back from the alternate parameter domain to the natural parameter domain? Alternate parameter domain: P,V EB Natural design parameter domain: W,IDQ P I DQ= V DD V SS W P = V V μc V 2 DD SS OX EB V =V V I INQ SS T DQ 2 C W OX 11

12 Design With the Basic Amplifier Structure Consider basic op amp structure V DD I DQ V OUT Alternate parameter domain: Degrees of Freedom: 2 A = V0 2 1 λ V EB P,V EB V in V SS M 1 C P I DQ= V DD V SS 2 DD OX EB 2 P GB= V DD C V EB W 2P = V μc V V INQ=VSS VT IDQ 2 C W OX But what if the design requirement dictates that V INQ =0? Increase the number of constraints from 1 to 2 Decrease the Degrees of Freedom from 2 to 1 Question: How can one meet two or more performance requirements with one design degree of freedom with this circuit? 12

13 Design With the Basic Amplifier Structure Consider basic op amp structure V DD I DQ V OUT Alternate parameter domain: Degrees of Freedom: 2 A = V0 2 1 λ V EB P,V EB V in V SS M 1 C P W P I = = 2 V DQ DD 2 P GB= V DD C V EB V μc V INQ SS T DQ DD OX EB V =V V I 2 C W OX But what if the design requirement dictates that V INQ =0? Question: How can one meet two or more performance requirements with one design degree of freedom with this circuit? Degrees of Freedom: 1 uck or Can t 13

14 How do we design an amplifier with a given architecture? 1. Determine the design space 2. Identify the constraints 3. Determine the entire set of unknown variables and the Degrees of Freedom 4. Determine an appropriate parameter domain 5. Explore the resultant design space with the identified number of Degrees of Freedom 14

15 Design Space Exploration Question: How does the GB of the single-stage amplifier change with bias current? GB increases linearly with I DQ GB g GB C m 2 I GB= DQ C V EB I DQ 15

16 Design Space Exploration Question: How does the GB of the single-stage amplifier change with bias current? GB increases with the square root of I DQ GB GB = 2μC W OX IDQ C I DQ 16

17 Design Space Exploration Question: How does the GB of the single-stage amplifier change with bias current? GB independent of I DQ GB 2 P GB= V C V DD EB I DQ 17

18 Design Space Exploration Question: How does the GB of the single-stage amplifier change with bias current? GB decreases with the reciprocal of the square root of I DQ GB GB= 1 P I C DQ 2μC OX W I DQ 18

19 Design Space Exploration Question: How does the GB of the single-stage amplifier change with bias current? GB 2C I DQ OX V C WP DD 3 GB decreases with the reciprocal of I DQ GB I DQ 19

20 Design Space Exploration Question: How does the GB of the single-stage amplifier change with bias current? GB 2 C I V DQ EB Increases inearly GB = 2μC W OX IDQ C 2 P GB= V DD C V EB Increases Quadratically Independent of I DQ GB I 2C 1 P OX DQ C W Decreases Quadradicly 3 2COXWP Decreases inearly V GB DD IDQC It depends upon how the design space is explored!!! 20

21 Design Space Exploration Different trajectories through a design space 21

22 Design Space Exploration Issue becomes more involved for amplifiers or circuits with more than one transistor Choice of design parameters can have major impact on insight into design Size of parameter domain should agree with the number of degrees of freedom Affects of any parameter on performance whether it be in the identified parameter domain or not is strongly dependent on how design space is explored Small signal and natural parameter domains give little insight into design or performance 22

23 Single-Stage ow-gain Op Amps Single-ended input V DD I DQ V OUT A V V in M 1 C V XX V SS Basic single-stage op amp 23

24 Single-Stage ow-gain Op Amps Single-ended input Observations: A V This circuit often known as a common source amplifier Gain in the 30dB to 45dB range Inherently a transconductance amplifier since output impedance is high Voltage gain is ratio of transconductance gain to output conductance Critical to know degrees of freedom in design and know how to systematically explore design space Alternative parameter domain much more useful for design than smallsignal domain or natural domain Performance of differential circuits will be obtained by inspection from those of the single-ended structures 24

25 Review Multiple parameter domains can be used to characterize and explore a design space Performance characteristics of interest take on many different forms depending upon how design space is characterized Critical to identify the real number of degrees of freedom in design space (mathematical degrees of freedom minus the number of constraints) Performance characteristics often can be expressed as product of a process dependent term and an architecture dependent term Facilitates comparison of different architectures Choice of characterization parameters can make a major difference on how hard it is to explore a design space 25

26 Review Design space is often a highdimensional system with many local extrema (minimums or maximums) Be careful about drawing conclusions about how any parameter individually affects system performance because its affect will depend upon how the design space is explored 26

27 Design Space for Single-Stage Op Amp Plot of GB V GBN 2 C DD P VEB P V EB Can we say that GB increases linearly with P? 27

28 Design Space for Single-Stage Op Amp Plot of GB V GBN 2 C DD P VEB P V EB Can we say that GB increases linearly with P? Can we say that GB increases linearly with P if A V is fixed? 28

29 Where we are at: Basic Op Amp Design Fundamental Amplifier Design Issues Single-Stage ow Gain Op Amps Single-Stage High Gain Op Amps Two-Stage Op Amp Other Basic Gain Enhancement Approaches 29

30 Where we are at: Single-Stage ow-gain Op Amps Single-ended input Differential Input (Symbol does not distinguish between different amplifier types) 30

31 Differential Input ow Gain Op Amps Will Next Show That : Differential input op amps can be readily obtained from single-ended op amps Performance characteristics of differential op amps can be directly determined from those of the single-ended counterparts 31

32 Systematic strategies for designing and analyzing op amps Analytical expressions for even simple op amps can become very complicated if brute force analysis techniques are used Considerable insight into both performance and design can be obtained from a systematic strategy for design and analysis of op amps Most authors present operational amplifiers from an appear and analyze approach A systematic strategy for designing and analyzing op amps will now be developed 32

33 Symmetric Networks Theorem: If a linear network is symmetric, then for all differential symmetric excitations, the small signal voltage is zero at all points on the axis of symmetry. V d 2 E E V d 2 V X =0 Axis of Symmetry 33

34 Counterpart Networks Definition: The counterpart network of a network is obtained by replacing all n- channel devices with p- channel devices, replacing all p-channel devices with n- channel devices, replacing V SS biases with V DD biases, and replacing all V DD biases with V SS biases. 35

35 Counterpart Networks Example: V DD V DD M 3 M 4 M 2 M 2 M 1 M 1 V SS V SS 36

36 Counterpart Networks V DD M 2 the counterpart network is unique the counterpart of the counterpart is the original network M 1 V SS 37

37 Counterpart Networks Theorem: The parametric expressions for all small-signal characteristics, such as voltage gain, output impedance, and transconductance of a network and its counterpart network are the same. 38

38 Synthesis of fully-differential op amps from symmetric networks and counterpart networks Theorem: If F is any network with a single input and P is its counterpart network, then the following circuits are fully differential circuits --- op amps. V BB VOUT V d 2 P F V DD P F V BB V OUT V BB VOUT P V DD P V BB V OUT V d F F V d V 2 2 d V 1 V 2 V 2 1 V 2 I BIAS V SS V d V 1 V 2 39

39 End of ecture 3 40

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