CMOS Optical Preamplifier Design Using Graphical Circuit Analysis

More documents

Recommendations

Info

4.5.2 Transistor Circuit Examples EXAMPLE 4.4 A SOURCE FOLLOWER AMPLIFIER 4.5 Analyzing Transistor Circuits 100 We want to determine the gain of the source follower amplifier shown in Figure 4.24. The amplifier is biased with a simple current mirror, and it can be easily shown that the impedance looking into the output of the current mirror is simply . As such, the SFG for the amplifier is essentially the SFG of transistor M 1 as shown in Figure 4.25. Since the drain of M 1 is connected to ground in the small-signal sense, much of the SFG for the MOSFET can be eliminated, as illustrated by the dashed lines. The gain of the amplifier can be seen to be v in (4.16) which is the expected voltage gain of a source follower when the body effect is taken into account. vout r || ds1 rds2 -------- = gm1 × --------------------------------------------------------------------------- 1 + ( r || ds1 rds2) × ( gm1+ gs1) g m1 = ------------------------------------------------------------------------gm1 + gs1 + 1 ⁄ rds1 + 1 ⁄ rds2 ≈ gm1 -----------------------gm1 + gs1 I bias V DD v in Note that the final gain expression in Equation (4.16) can be obtained directly by applying the Source Absorption Theorem. 4 From a DPI/SFG perspective, the trans- M 1 M 3 M2 v out Figure 4.24 Source follower amplifier. r ds2
Figure 4.25 SFG for the source follower amplifier. 4.5 Analyzing Transistor Circuits 101 conductance feedback path is collapsed to create a single forward path whose trans- mittance is simply the original DPI of the node with a new resistance of placed in parallel as shown in Figure 4.26. i scx Z 1 v x One of the common challenges of analyzing the source follower amplifier is recog- nizing that feedback exists in the amplifier. With DPI/SFG analysis, the feedback is explicitly represented in the SFG. Moreover, we have shown that this difficulty in 4. See [Sedra, 1998], Appendix E. v in – gm1 g m1 Z 1 v x - g m g m v x i scD1 i scout 0 1 ⁄ rds1 gm1 + gs1 + 1 ⁄ rds1 r || ds1 rds2 - gm1– gs1 i scx v D1 v out = 0 Z || 1 1 ⁄ gm Z || 1 1 ⁄ gm Figure 4.26 The source absorption theorem: collapsing a transconductance feedback path into a resistance. v x v x 1 ⁄ gm
Page 1 and 2:
CMOS Optical Preamplifier Design Us
Page 3 and 4:
To achieve low-voltage operation, w
Page 5 and 6:
Table of Contents CHAPTER 1 INTRODU
Page 7 and 8:
CHAPTER 1 1.1 OVERVIEW Introduction
Page 9 and 10:
Information Source Modulator Drive
Page 11 and 12:
1.2 Thesis Outline 5 [Ohhata,1999].
Page 13 and 14:
1.2 Thesis Outline 7 technique call
Page 15 and 16:
1.2 Thesis Outline 9 Detector in St
Page 17 and 18:
E e + - V bias 2.1 Photodetectors 1
Page 19 and 20:
Diode Capacitance (pF) Diode capaci
Page 21 and 22:
2.2 Optical Preamplifier Structures
Page 23 and 24:
2.3 Transimpedance Amplifier Design
Page 25 and 26:
Page 27 and 28:
I dc 2.3 Transimpedance Amplifier D
Page 29 and 30:
Page 31 and 32:
Source Figure 2.11 General structur
Page 33 and 34:
A = = For = 1V , the solution is v
Page 35 and 36:
The gain of the forward amplifier c
Page 37 and 38:
Feedback Analysis Using Return Rati
Page 39 and 40:
2.4 Circuit Analysis Techniques 33
Page 41 and 42:
2.5 An Overview of Signal-Flow Grap
Page 43 and 44:
1 x1 x2 2.5 An Overview of Signal-F
Page 45 and 46:
2.6 SUMMARY REFERENCES • ∆ k =
Page 47 and 48:
Symp. Circuits Systems, vol. 3, pp.
Page 49 and 50:
CHAPTER 3 New Transimpedance Amplif
Page 51 and 52:
3.1 A Differential Transimpedance A
Page 53 and 54:
3.1 A Differential Transimpedance A
Page 55 and 56: 3.1 A Differential Transimpedance A
Page 57 and 58: 3.2 A Feedback Topology for Ambient
Page 59 and 60: 3.2 A Feedback Topology for Ambient
Page 61 and 62: Transimpedance (dBΩ) 90 80 60 40
Page 63 and 64: 3.3 A Low-Voltage Transimpedance Am
Page 73 and 74: C 3 Φ1VB M 3 V B- =0.7V M 7 Figure
Page 77 and 78: 3.4 SUMMARY 3.4 Summary 71 In this
Page 79 and 80: 3.4 Summary 73 Y. Nakagome et al.,
Page 81 and 82: 4.1 Introduction 75 back topology o
Page 83 and 84: 4.2 Circuit Analysis Using Driving-
Page 91 and 92: 4.3 DPI/SFG: Combining DPI Analysis
Page 93 and 94: 4.4 Determining Port Impedances 87
Page 95 and 96: v i R in v o R out 4.4 Determining
Page 97 and 98: id » ro and 1 ⁄ rid « Av ⁄ ro
Page 103 and 104: Z b r e g m 4.5 Analyzing Transisto
Page 105: 4.5 Analyzing Transistor Circuits 9
Page 109 and 110: 4.5 Analyzing Transistor Circuits 1
Page 115 and 116: 5.1 Analysis of the Low-Voltage Tra
Page 117 and 118: 5.1 Analysis of the Low-Voltage Tra
Page 119 and 120: 5.2 DEVELOPING AN ANALYTIC CIRCUIT
Page 121 and 122: Z in 5.2 Developing an Analytic Cir
Page 123 and 124: 5.2 Developing an Analytic Circuit
Page 125 and 126: I n1 : i in I n2 -I n1 i scin ( sCi
Page 129 and 130: I nRf : 5.2 Developing an Analytic
Page 131 and 132: DC transimpedance gain: Pole locati
Page 133 and 134: Frequency (MHz) 500 450 400 350 300
Page 135 and 136: Pole frequencies(MHz) 500 450 400 3
Page 137 and 138: Optimizing Sensitivity 5.2 Developi
Page 141 and 142: Transimpedance Volts dB (lin) Gain
Page 143 and 144: CHAPTER 6 Implementation and Experi
Page 145 and 146: 6.1 A 1V Optical Receiver Front-End
Page 149 and 150: 6.1.2 Experimental Results 6.1 A 1V
Page 151 and 152: Gain(dB) 0 −1 −2 −3 −4 −5
Page 157 and 158:
6.1 A 1V Optical Receiver Front-End
Page 159 and 160:
Clock signal of voltage doubler Eye
Page 161 and 162:
6.2 Variable-Gain Transimpedance Am
Page 163 and 164:
6.2.2 Experimental Results 6.2 Vari
Page 165 and 166:
6.3 Summary and State-of-the-Art Co
Page 167 and 168:
Reference Outputs Technology Supply
Page 169 and 170:
CHAPTER 7 Conclusions 7.1 SUMMARY A
Page 171 and 172:
7.2 Future Work 165 The significanc
Page 173 and 174:
7.2 Future Work 167 supply and subs
Page 175 and 176:
v s i ti that part of the SFG for Q
Page 177 and 178:
Thus, P1 ′ = b = 500Ω ∆1 ′
Page 179 and 180:
itive representation of circuit dyn
Page 181 and 182:
Bipolar Transistor i scb Z b v b b
show all

CMOS Optical Preamplifier Design Using Graphical Circuit Analysis

Create successful ePaper yourself

Delete template?

Save as template?