Book contents
- Frontmatter
- Contents
- Preface
- 1 Introduction
- 2 High-frequency and high-data-rate communication systems
- 3 High-frequency linear noisy network analysis
- 4 High-frequency devices
- 5 Circuit analysis techniques for high-frequency integrated circuits
- 6 Tuned power amplifier design
- 7 Low-noise tuned amplifier design
- 8 Broadband low-noise and transimpedance amplifiers
- 9 Mixers, switches, modulators, and other control circuits
- 10 Design of voltage-controlled oscillators
- 11 High-speed digital logic
- 12 High-speed digital output drivers with waveshape control
- 13 SoC examples
- Appendix 1 Trigonometric identities
- Appendix 2 Baseband binary data formats and analysis
- Appendix 3 Linear matrix transformations
- Appendix 4 Fourier series
- Appendix 5 Exact noise analysis for a cascode amplifier with inductive degeneration
- Appendix 6 Noise analysis of the common-emitter amplifier with transformer feedback
- Appendix 7 Common-source amplifier with shunt–series transformer feedback
- Appendix 8 HiCUM level 0 model for a SiGe HBT
- Appendix 9 Technology parameters
- Appendix 10 Analytical study of oscillator phase noise
- Appendix 11 Physical constants
- Appendix 12 Letter frequency bands
- Index
- References
6 - Tuned power amplifier design
Published online by Cambridge University Press: 05 March 2013
Book contents
- Frontmatter
- Contents
- Preface
- 1 Introduction
- 2 High-frequency and high-data-rate communication systems
- 3 High-frequency linear noisy network analysis
- 4 High-frequency devices
- 5 Circuit analysis techniques for high-frequency integrated circuits
- 6 Tuned power amplifier design
- 7 Low-noise tuned amplifier design
- 8 Broadband low-noise and transimpedance amplifiers
- 9 Mixers, switches, modulators, and other control circuits
- 10 Design of voltage-controlled oscillators
- 11 High-speed digital logic
- 12 High-speed digital output drivers with waveshape control
- 13 SoC examples
- Appendix 1 Trigonometric identities
- Appendix 2 Baseband binary data formats and analysis
- Appendix 3 Linear matrix transformations
- Appendix 4 Fourier series
- Appendix 5 Exact noise analysis for a cascode amplifier with inductive degeneration
- Appendix 6 Noise analysis of the common-emitter amplifier with transformer feedback
- Appendix 7 Common-source amplifier with shunt–series transformer feedback
- Appendix 8 HiCUM level 0 model for a SiGe HBT
- Appendix 9 Technology parameters
- Appendix 10 Analytical study of oscillator phase noise
- Appendix 11 Physical constants
- Appendix 12 Letter frequency bands
- Index
- References
Summary
What is a tuned power amplifier?
Tuned power amplifiers are key components in the transmission path of wireless communication systems and in automotive radar. They typically deliver the power required for transmitting information to the antenna with high efficiency and, usually, high linearity, over bandwidths of 10% to 20% relative to the center frequency of the amplifier. For battery-operated applications in particular, minimum DC power consumption at a specified output power level is required.
As shown in Figure 6.1, in its idealized representation, a tuned power amplifier consists of a common-emitter or common-source (very large) transistor operating under large signal conditions with large output voltage swing. The transistor drain/collector is biased through a bias T (which presents an infinite inductor to the power supply and an infinite capacitor towards the load) and is loaded with a parallel resonant tank (formed by RL, C1, L) at the frequency of interest. For the sake of simplicity, we will assume that the transistor output capacitance, Cout = Cds + Cgd or Cbc + Ccs, is absorbed in the load capacitance C1. In a similar manner, RL includes the loss resistance of inductor L1 and capacitor C1. The circuit draws DC power from the supply to amplify the input signal power and deliver it to the load. Ideally all of the DC power and the input signal power should be converted to output signal power. In practice, at least some of the DC power is dissipated as heat.
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- Information
- High-Frequency Integrated Circuits , pp. 374 - 438Publisher: Cambridge University PressPrint publication year: 2013
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