Radio Frequency Integrated Circuit Design - Webs

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Power Amplifiers stabilization. Then input power was swept to determine the power level at which the current went to zero. This power was used as a starting point for several iterations of sweeps of load pull and input power used to determine the optimal output load and the required input power. The transistor current crosses zero for an input power of about 8 dBm, as shown in Figure 10.18. The load pull shown in Figure 10.19 indicated the optimal load should be 9 + j7.6. This is a little bit lower than the predicted 15.6�, explained largely by the reduced voltage swing compared to that predicted. The inductive portion of the load ( j7.6) accounts largely for the transistor output capacitance. The sweeps of Pout and power-added efficiency versus P in shown in Figure 10.20 shows that 1-dB compression occurs at an input power of about 9 or 10 dBm and that power-added efficiency is just over 30% at an input power of 8 dBm, rising to about 42% at 10 dBm. The output power is about 23 dBm as required. Several differences can be seen between this simulation and simple theory. The simple equations were derived assuming that output voltage swings from 0 to 6V. This does not happen, and thus power is a little bit low. This also directly leads to a lower optimal load impedance than was initially calculated. In this example, ideal models were used for passives and packaging. Obviously, realistic models would have resulted in a reduction in efficiency. Figure 10.18 Voltage and current waveforms for input power levels of 8, 9, and 10 dBm. 365
366 Radio Frequency Integrated Circuit Design Figure 10.19 Load pull for an input power of 8.5 dBm. Figure 10.20 Gain and power-added efficiency versus input power. Example 10.2 Class AB Power Amplifier As a continuation of the previous example, design a class AB power amplifier that will drive 200 mW into a 50-� load at 1 GHz from a 3V power supply. As before, the transistor unit cell that is available had the f T versus current relationship shown in Figure 10.17. Design for the optimal PAE.
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Radio Frequency Integrated Circuit
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Radio Frequency Integrated Circuit
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Contents Foreword xv Acknowledgment
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Contents 3.8 Base Shot Noise Discus
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Contents 5.25 Packaging 135 5.25.1
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Contents 7.12 General Design Commen
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Contents 9.5 Some Simple Image Reje
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Foreword I enjoyed reading this boo
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Foreword estimates of parasitic cap
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xx Radio Frequency Integrated Circu
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2 Radio Frequency Integrated Circui
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2 Issues in RFIC Design, Noise, Lin
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Issues in RFIC Design, Noise, Linea
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The input noise is Issues in RFIC D
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2.5 Filtering Issues Issues in RFIC
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3 A Brief Review of Technology 3.1
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A Brief Review of Technology IC = I
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3.4 Small-Signal Model A Brief Revi
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3.6 High-Frequency Effects A Brief
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A Brief Review of Technology If thi
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A Brief Review of Technology Soluti
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A Brief Review of Technology 3.8 Ba
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A Brief Review of Technology • Pi
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A Brief Review of Technology 3.16,
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A Brief Review of Technology The tr
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4 Impedance Matching 4.1 Introducti
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Impedance Matching Z 2 = Z in + j
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Figure 4.5 A Smith chart. Impedance
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4.3 Impedance Matching Impedance Ma
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Impedance Matching Figure 4.9 Which
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Impedance Matching Figure 4.11 Lowp
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Impedance Matching section, convers
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Impedance Matching Much as in the p
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Impedance Matching Note that dots i
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Impedance Matching Thus, in the fir
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Impedance Matching The exact resist
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Impedance Matching 4.10 Quality Fac
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Impedance Matching Example 4.7 Matc
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Impedance Matching line to change w
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Impedance Matching S22 = b 2 a2 | a
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Impedance Matching without the need
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96 Radio Frequency Integrated Circu
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100 Radio Frequency Integrated Circ
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Voltage-Controlled Oscillators back
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I C_AVE = 1 Voltage-Controlled Osci
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Voltage-Controlled Oscillators Loop
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Voltage-Controlled Oscillators freq
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Voltage-Controlled Oscillators Figu
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Page 338: Voltage-Controlled Oscillators [10]
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Page 370 and 371: 10 Power Amplifiers 10.1 Introducti
Page 372 and 373: Power Amplifiers where G is the pow
Page 374 and 375: Power Amplifiers Figure 10.4 Optima
Page 376 and 377: Power Amplifiers Figure 10.8 Power
Page 378 and 379: Power Amplifiers Figure 10.9 Curren
Page 380 and 381: Power Amplifiers The efficiency is
Page 382 and 383: Power Amplifiers sinusoid), this pe
Page 384 and 385: Power Amplifiers Note that this agr
Page 388 and 389: Power Amplifiers Solution The first
Page 390 and 391: Power Amplifiers Figure 10.22 Class
Page 392 and 393: Figure 10.24 Class E waveforms. Pow
Page 394 and 395: Power Amplifiers B = 0.1836 0.81Q R
Page 396 and 397: Power Amplifiers Figure 10.25 Initi
Page 398 and 399: Power Amplifiers added to the funda
Page 400 and 401: Power Amplifiers 10.8.1 Variation o
Page 402 and 403: Example 10.4 Class F Power Amplifie
Page 404 and 405: Figure 10.36 Class H amplifier. Pow
Page 406 and 407: Power Amplifiers ered quite good. O
Page 408 and 409: Power Amplifiers Figure 10.39 Time-
Page 410 and 411: Figure 10.42 High-Q matching circui
Page 412 and 413: Figure 10.44 Multiple transistors.
Page 414 and 415: Power Amplifiers Figure 10.48 Combi
Page 416 and 417: Power Amplifiers have very narrow b
Page 418 and 419: Power Amplifiers Figure 10.53 Feedf
Page 420 and 421: Power Amplifiers in class A (input
Page 422 and 423: About the Authors John Rogers recei
Page 424 and 425: Index 1-dB compression point, 30-32
Page 426 and 427: Index Damped resonator, 247-48 Emit
Page 428 and 429: Index Local oscillator, 5 Mixing co
Page 430 and 431: Index Quadrature phase shift keying
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