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High-Linearity CMOS RF Front-End Circuits Yongwang Ding Ramesh Harjani

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High-Linearity CMOS RF Front-End Circuits Yongwang Ding Ramesh Harjani High-Linearity CMOS RF Front-End Circuits Yongwang Ding Ramesh Harjani iigh-Linearity CMOS tF Front-End Circuits - Springer Library of Congress Cataloging-in-Publication Data A C.I.P. Catalogue record for this book is available from the Library of Congress. ISBN 0-387-23801-8 e-ISBN 0-387-23802-6 Printed on acid-free paper. O 2005 Springer Science+Business Media, Inc. All rights reserved. This work may not be translated or copied in whole or in part without the written permission of the publisher (Springer Science+Business Media, Inc., 233 Spring Street, New York, NY 10013, USA), except for brief excerpts in connection with reviews or scholarly analysis. Use in connection with any form of information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now know or hereafter developed is forbidden. The use in this publication of trade names, trademarks, service marks and similar terms, even if the are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights. Printed in the United States of America. SPIN 11345145 To my parents Contents Dedication List of Figures List of Tables 1. INTRODUCTION 1 Development of radio frequency ICs 2 Challenges of modem RF IC design in CMOS 2.1 Noise 2.2 Linearity 3 Contributions of this work 2. RF DEVICES IN CMOS PROCESS 1 Introduction 2 MOSFET 2.1 Transconductance 2.2 Small-signal model 2.3 Linearity 2.4 Noise 3 Inductor 3.1 Layout 3.2 Simulation 3.3 Modeling 4 Capacitor 4.1 Metal capacitor 4.2 Polysilicon capacitor 4.3 Varactor 5 Resistor ... Vlll HIGH-LINEARITY CMOS RF FRONT-END CIRCUITS 6 Summary 3. LINEAR TRANSCONDUCTORS IN CMOS Differential pair Bias offset cross-coupled differential pair Source degenerated transconductor 3.1 Linear resistor degeneration 3.2 Triode-mode transistor degeneration 3.3 Degeneration with constant V,, Differential pair with a constant sum of V,, 4.1 Source grounded pair 4.2 Differential pair with floating voltage source 4.3 Differential pair with mobility compensation Cross-coupled differential pairs with harmonic cancellation Summary 4. LINEARIZATION WITH HARMONIC CANCELLATION Linearization in zero-memory weakly nonlinear systems 1.1 3rd order harmonic cancellation 1.2 Higher order harmonic cancellation Linearization in weakly nonlinear systems with memory Linearity and power consumption Trade off between gain, power consumption and noise 4.1 Impact on power consumption 4.2 Impact on gain 4.3 Impact on noise Harmonic cancellation with imperfections 5.1 Harmonic cancellation with input mismatch 5.2 Harmonic cancellation with circuit mismatch Summary 5. LNA DESIGN IN CMOS 1 Common-gate low noise amplifier 1.1 Gain 1.2 Noise 1.3 Linearity 1.4 Common-gate LNA with harmonic cancellation 2 Common-source low noise amplifier 2.1 Gain Contents Noise Linearity Common-source LNA with harmonic cancellation An example of a common-source LNA 3 Summary 6. DOWN-CONVERSION MIXER DESIGN IN CMOS 1 Passive mixer 1.1 Conversion gain 1.2 Noise 1.3 Linearity Gilbert mixer 2.1 Conversion gain 2.2 Noise 2.3 Linearity Gilbert mixer with harmonic cancellation 3.1 Conversion gain 3.2 Improvement of dynamic range 3.3 An example of a receiver RF front-end with harmonic cancellation Summary 7. POWER AMPLIFIER DESIGN IN CMOS 1 Traditional CMOS linear power amplifiers 1.1 Class A amplifier 1.2 Class B amplifier 1.3 Class AB amplifier CMOS parallel class A&B amplifier 2.1 Improvement of linear range 2.2 Power efficiency improvement 2.3 An example of parallel class A&B power amplifier Summary 8. CONCLUSIONS References Index List of Figures Small-signal noise model of a MOSFET Definition of P 1dB Definition of IP3 Cross section of an NMOS I-V curve of a typical NMOS Small-signal model of a MOSFET in saturation RF small-signal model of a MOSFET Simple amplifier Simulated gain of the simple amplifier (Figure 2.5) Common-source grounded MOSFET pair IIV3 vs. drain current and cut-off frequency of a typical NMOS Flicker noise corner frequency Noise model of MOSFET Noise model of MOSFET at low frequencies Noise model of MOSFET at high frequencies Square spiral inductor Circular spiral inductor Octagonal spiral inductor Square spiral inductor with polysilicon patterned ground shield 5-element spiral inductor model 9-element spiral inductor model 11-element spiral inductor model Metal plate capacitor xii HIGH-LINEARITY CMOS RF FRONT-END CIRCUITS Metal sandwich capacitor Interdigitated metal capacitor Accumulation mode varactor Inversion mode varactor An NMOS differential pair Cross-coupled differential pair Source degenerated differential pair Source degenerated differential pair with two current sources Source degenerated differential pair of "super MOS' Differential pair degenerated by transistors in triode mode Source degenerated differential pair with constant 6, Transistor degenerated differential pair with constant Vg,in CMOS Source grounded differential pair Differential pair with floating voltage sources An example of differential pair with floating voltage sources Effective model of NMOS with mobility degradation Differential pair with mobility compensation Differential pair with harmonic cancellation Linearization of the system with rdpower order nonlinearity Linearization ofthe system with ydand sth power order nonlinearity A weakly nonlinear system expressed in the form of a Volterra series Block diagram of the linearization technique for 3d order harmonic cancellation IIP3 comparison of MOSFET with and without rdhar- monic cancellation Impact of input mismatch on intermodulation suppression Impact of circuit mismatch on intermodulation suppression Common-gate LNA Common-gate LNA with harmonic cancellation Simple common-source amplifier Inductive source-degenerated LNA Small-signal model of an inductive source-degenerated LNA Source-degenerated LNA with harmonic cancellation ... List of Figures Xlll Die photograph of a source-degenerated LNA with har- monic cancellation 69 Two tone test with and without 3rd harmonic cancellation 70 Comparison of the intermodulation signals for smaller inputs 70 Comparison of IIP3 with and without S~harmonic cancellation 7 1 Comparison of reported IIP3 vs. power consumption Diode mixer Double-balanced passive mixer Gilbert mixer Double-balanced Gilbert mixer Switching gain curve of a double-balanced Gilbert mixer Double-balanced Gilbert mixer with DC current stealing Double-balanced Gilbert mixer with harmonic cancellation LNA and Gilbert mixer LNA and Gilbert mixer with harmonic cancellation Complete schematic of LNA and Gilbert mixer with harmonic cancellation IIP3 curve of the traditional RJ? front-end IIP3 curve of the RF front-end with harmonic cancellation General CMOS power amplifier circuit Drain current and voltage of class A amplifier Impedance match by a quarter wave length transmission line Impedance match by LC network Single MOSFET amplifier with inductive reverse isolation Measured gain curves of a single MOSFET class A am- plifier and a cascode class A amplifier Drain current and voltage of class B amplifier Conceptual block diagram for the parallel class A&B amplifier 103 Transconductances for Class A, class B and parallel class A&B for different y,i,,s 105 Parallel class A&B amplifier transfer characteristics 105 Comparison of intermodulation products 106 Source follower 107 Comparison of PAE 108 Circuit schematic for the CMOS parallel class A&B amplifier 109 Die microphotograph of the CMOS parallel class A&B amplifier xiv HIGH-LINEARITY CMOS RF FRONT-END CIRCUITS 7.16 CMOS parallel class A&B amplifier measurement results 110 List of Tables 2.1 Coefficients of modified Wheerler's formula 5.1 Summary of measured results 6.1 Summary of simulation results 7.1 Comparison of measured results Chapter 1 INTRODUCTION This book focuses on high performance radio frequency integrated circuits (RF IC) design in CMOS. 1. Development of radio frequency ICs Wireless communications has been advancing rapidly in the past two decades. Many high performance systems have been developed, such as cellular systems (AMPS, GSM, TDMA, CDMA, W-CDMA, etc.), GPS system (global posi- tioning system) and WLAN (wireless local area network) systems. The rapid growth of VLSI technology in both digital circuits and analog circuits provides benefits for wireless communication systems. Twenty years ago not many peo- ple could imagine millions of transistors in a single chip or a complete radio for size of a penny. Now not only complete radios have been put in a single chip, but also more and more functions have been realized by a single chip and at a much lower price. A radio transmits and receives electro-magnetic signals through the air. The signals are usually transmitted on high frequency carriers. For example, a typ- ical voice signal requires only 30 Kilohertz bandwidth. When it is transmitted by a FM radio station, it is often carried by a frequency in the range of tens of megahertz to hundreds of megahertz. Usually a radio is categorized by its carrier frequency, such as 900 MHz radio or 5 GHz radio. In general, the higher the carrier frequency, the better the directivity, but the more difficult the radio design. There are many radio standards that are employed these days, such as 100 MHz FM radios, 1 GHz analog cell phone radios, 2 GHz digital cell phone radios, and 5 GHz radios in wireless LAN. In the past radios were built using discrete components: transistors, diodes, inductors, resistors, capacitors, etc. With the development of high speed VLSI process radios can now be made of individual chip sets and each individual HIGH-LINEARITY CMOS RF FRONT-END CIRCUITS chip is built as a stand-alone block with different functions. Many design techniques have also been developed for integrated circuits so that more and more individual blocks are integrated together and a single chip radio is finally becoming a reality.
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