Analog Circuits and Signal Processing

By: Shouri Chatterjee, Kong Pang Pun, Nebojsa Stanic

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Hardcover | 16 August 2007

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Hardcover
172 Pages

Dimensions(cm)
23.39 x 15.6 x 1.12

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Analog design at ultra-low supply voltages is an important challenge for the semiconductor research community and industry.

Analog Circuit Design Techniques at 0.5V covers challenges for the design of MOS analog and RF circuits at a 0.5 V power supply voltage. All design techniques presented are true low voltage techniques - all nodes in the circuits are within the power supply rails. The circuit implementations of body and gate input fully differential amplifiers are also discussed. These building blocks enable us to build continuous-time filters, track-and-hold circuits, and continuous-time sigma delta modulators.

Current books on low voltage analog design typically cover techniques for supply voltages down to approximately 1V. This book presents novel ideas and results for operation from much lower supply voltages and the techniques presented are basic circuit techniques that are widely applicable beyond the scope of the presented examples.

Analog Circuit Design Techniques at 0.5V is written for analog circuit designers and researchers as well as graduate students studying semiconductors and integrated circuit design.

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Published: 19th November 2010

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Introduction	p. 1
Low-voltage analog circuit design challenges	p. 4
Opportunities at low voltages	p. 9
Organization of the book	p. 14
Fully Differential Operational Transconductance Amplifiers (OTAs)	p. 17
Body-input OTA	p. 19
Gate-input OTA	p. 23
On-chip biasing circuits for the gate-input OTA	p. 29
Error amplifier	p. 30
Generating a fixed level shift	p. 31
Setting the OTA output DC common-mode voltage	p. 32
Gain enhancement	p. 33
Start-up	p. 35
Characterization results for the body-input and gate-input OTAs	p. 35
Body-input OTA measurements	p. 35
Gate-input OTA measurements	p. 36
Discussion on the two OTA design techniques	p. 39
Design methodology for low V[subscript T] devices, without body access	p. 41
Fully differential OTA	p. 41
Bias circuits	p. 45
Summary	p. 45
Weak Inversion MOS Varactors for Tunable Integrators	p. 49
Brief theoretical overview	p. 50
Device measurements and modeling	p. 50
Closed-form model	p. 52
Channel segmentation	p. 54
Comparison between measured results and simulations	p. 56
Circuit applications	p. 56
Discrete prototype using the varactor	p. 56
Application of the varactor in an integrated setting	p. 56
Summary	p. 60
A 0.5 V 5th-Order Low-Pass Elliptic Filter	p. 61
Filter topology	p. 61
On-chip PLL-based automatic frequency tuning loop	p. 62
Layout and prototype chip	p. 65
Characterization Results	p. 66
Test set-up	p. 66
Frequency response	p. 66
Noise	p. 67
Distortion and characterization over tuning range	p. 67
Performance at different power supply voltages	p. 69
Performance over different chips	p. 69
Performance over temperature	p. 71
Summary	p. 71
A 0.5 V Track-and-Hold (T/H) Circuit	p. 77
Introduction	p. 77
T/H operation at ultra-low voltages	p. 77
Fully-differential 0.5 V T/H circuit	p. 79
Charge injection and sampling times	p. 80
Fully-differential implementation	p. 81
Common-mode rejection	p. 81
Integrated noise	p. 83
Track-and-hold test strategy	p. 86
Design details and measurement results	p. 86
Gate-input OTA	p. 86
Switches	p. 87
Clock generation	p. 87
Prototype chip	p. 90
Simulated performance	p. 91
Measured performance	p. 91
Conclusion	p. 92
A 0.5 V Continuous-Time [Sigma Delta] Modulator	p. 97
Introduction	p. 97
Return-to-Open DAC	p. 98
Similar DAC concepts	p. 99
Noise improvements by RTO DAC	p. 102
Return to Zero timing	p. 103
Split RTO DAC Modulator Architecture	p. 103
Modulator clocking	p. 104
Modulator design	p. 105
Values of R and C	p. 106
Building Block Circuits for 0.5 V Supply	p. 108
RTO DAC Circuit	p. 108
Comparator	p. 110
Operational transconductance amplifiers	p. 110
Clock generation circuit	p. 112
Experimental Results	p. 112
Conclusions	p. 120
0.5 V Receiver Front-End Circuits	p. 121
Introduction	p. 121
RF Receiver System-Level Considerations	p. 121
Low-Noise Amplifiers	p. 122
Basic Properties and Standard Topologies	p. 122
Low-Voltage Considerations	p. 123
Downconversion Mixers	p. 124
Basic Properties and Standard Topologies	p. 124
Low-Voltage Considerations	p. 126
900 MHz Receiver Front-End in 0.18 [mu]m CMOS	p. 127
Design of the LNA	p. 127
Design of the downconversion mixer	p. 130
Design of the LO buffers	p. 134
Measurement and results	p. 135
Analysis of a Distributed Model for a MOS Capacitor	p. 141
References	p. 147
Index	p. 155
Table of Contents provided by Ingram. All Rights Reserved.

Analog Circuits and Signal Processing

At a Glance

Hardcover

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You Can Find This Book In

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