CMOS Optical Preamplifier Design Using Graphical Circuit Analysis

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7.2 Future Work 166 For ambient light rejection, we have presented an alternative feedback topology that realizes differential photocurrent sensing, provides improved supply noise rejection, and eliminates the need for a dummy matching capacitor [Zand,1999]. A fully-differential implementation of the low-voltage transimpedance amplifier design could be implemented to improve supply noise rejection. Finally, work into optoelectronic integrated circuits (OEIC) could be initiated with the integration of a CMOS photodetector alongside one of the existing transimpedance amplifier designs. As analog designers look for ways to meet the challenge of decreased supply voltages, dynamic gate biasing (DGB) has the potential to become a general technique for realizing low-voltage analog circuits. However, before DGB can be more widely applied, we need a better understanding of the effects of charge injection and clock feedthrough on circuit performance. Future work should focus on developing methods of reducing such transient effects. At the same time, additional applica- tions of DGB need to be investigated. One example would be its use in tunable, low- voltage, continuous-time filters. Future work on DPI/SFG analysis is likely to focus on automating the analysis process, and in investigating its use in computer-aided design (CAD) for analog circuits. In practice, the manipulation of signal-flow graphs by hand is limited to only the simplest of circuits. There is a need to develop a computer-aided analysis tool that can automate much of the generation and manipulation of signal-flow graphs in the same way today’s math software has eliminated the need to perform cumber- some elimination of variables for sets of linear equations. Recent published efforts such as [Spence,1999] and [Katzenelson,1999] show that CAD for analog circuits is entering a renaissance period with the emphasis shifting towards providing a greater understanding of circuit behaviour beyond sim- ply determining performance characteristics. The continual trend towards greater integration, lower voltages, and lower power will drive the development of novel circuit techniques. Future circuit designers will require a greater ability to investi- gate circuit sensitivity to device parasitics, process variations, and noise from the
7.2 Future Work 167 supply and substrate. DPI/SFG analysis can play an integral part in analog CAD by allowing the analysis and manipulation of circuits at a symbolic level with greater ease. REFERENCES J. Katzenelson and A. Unikovski, “Symbolic-Numeric Circuit Analysis or Symbolic Circuit Analysis with Online Approximations,” IEEE Trans. Circ. and Syst. I, no. 1, pp. 197-207, Jan. 1999. K. Martin, private communication, 2000. R. Spence, “The Facilitation of Insight for Analog Design,” IEEE Trans. Circ. and Syst. II, vol. 46, no. 5, pp. 540-548, May 1999. B. Zand, K. Phang, and D.A. Johns, "Transimpedance Amplifier with Differential Photodiode Current Sensing," IEEE Int. Symp. Circuits and Systems, Orlando, FA, vol. 2, pp. 624-627, May 1999.
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CMOS Optical Preamplifier Design Us
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To achieve low-voltage operation, w
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Table of Contents CHAPTER 1 INTRODU
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CHAPTER 1 1.1 OVERVIEW Introduction
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Information Source Modulator Drive
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1.2 Thesis Outline 5 [Ohhata,1999].
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1.2 Thesis Outline 7 technique call
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1.2 Thesis Outline 9 Detector in St
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E e + - V bias 2.1 Photodetectors 1
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Diode Capacitance (pF) Diode capaci
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2.2 Optical Preamplifier Structures
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2.3 Transimpedance Amplifier Design
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I dc 2.3 Transimpedance Amplifier D
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Source Figure 2.11 General structur
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A = = For = 1V , the solution is v
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The gain of the forward amplifier c
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Feedback Analysis Using Return Rati
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2.4 Circuit Analysis Techniques 33
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2.5 An Overview of Signal-Flow Grap
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1 x1 x2 2.5 An Overview of Signal-F
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2.6 SUMMARY REFERENCES • ∆ k =
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Symp. Circuits Systems, vol. 3, pp.
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CHAPTER 3 New Transimpedance Amplif
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3.1 A Differential Transimpedance A
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3.2 A Feedback Topology for Ambient
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3.2 A Feedback Topology for Ambient
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Transimpedance (dBΩ) 90 80 60 40
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3.3 A Low-Voltage Transimpedance Am
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C 3 Φ1VB M 3 V B- =0.7V M 7 Figure
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3.4 SUMMARY 3.4 Summary 71 In this
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3.4 Summary 73 Y. Nakagome et al.,
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4.1 Introduction 75 back topology o
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4.2 Circuit Analysis Using Driving-
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4.3 DPI/SFG: Combining DPI Analysis
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4.4 Determining Port Impedances 87
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v i R in v o R out 4.4 Determining
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id » ro and 1 ⁄ rid « Av ⁄ ro
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Z b r e g m 4.5 Analyzing Transisto
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4.5 Analyzing Transistor Circuits 9
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Figure 4.25 SFG for the source foll
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5.1 Analysis of the Low-Voltage Tra
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5.1 Analysis of the Low-Voltage Tra
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5.2 DEVELOPING AN ANALYTIC CIRCUIT
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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
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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
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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: 7.2 Future Work 165 The significanc
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
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CMOS Optical Preamplifier Design Using Graphical Circuit Analysis

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