Foad Arfaei Malekzadeh's Analog Dithering Techniques for Wireless Transmitters PDF
By Foad Arfaei Malekzadeh
This ebook describes leading edge recommendations and the theoretical history for layout and research of excessive functionality RF/Microwave transmitters. It introduces new, strong linearization/efficiency enhancement suggestions, acceptable to all the switched mode energy amplifiers. Novel research tools linked to those new recommendations also are brought and helping dimension effects are documented. cutting edge graphical illustration equipment are used to aid the reader comprehend the problem intuitively. functions for the strategies mentioned are very broad, starting from info convertors to RF/Microwave/mm-wave wireless/wire line transmitters. The authors have shunned utilizing long formulation within the dialogue and feature used an intuitive and easy method of wade through the required details. Readers will achieve important knowing of the dither phenomenon, its mechanism, impact and undesired uncomfortable side effects. the radical architectures brought are easy, don’t require advanced DSP thoughts and are effortless to enforce.
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Additional resources for Analog Dithering Techniques for Wireless Transmitters
If the gain is not enough the dithered gain may drop a lot due to dithering, which will decrease the power added efficiency. Therefore, it can be understood that dithering doesn’t work quite well with linear PA classes like A; AB; C or J. 3 Dithering Limitations Fig. 12 The zero crossing frequency of the sum of two sinusoids at frequencies fr and fd ; with amplitudes r and A; representing signal and dither amplitudes, versus A=r: 55 f (Zero Crossing Frequency)/2 fr fd 1 fr / fd A/ r The second issue, besides slope gain is the dithering frequency versus process technology.
Load modulation is applicable to a tunable matching networks, in order to improve the linearity, while supply modulation can enhance the efficiency in the output power back off. Fig. 1 is an overview to the different system architectures that we can use in combination with dithering. In this chapter, first of all, all of the system architectures that conventionally have been used in combination with a dither signal will be introduced. Then the various hard nonlinear components are investigated at circuit level, with special interest to power amplifiers.
IEEE Trans Inf Theory, IT-21(6):671–675, Nov 1975 Chapter 5 Linearity Analysis Modern wireless communication systems utilize sophisticated modulation techniques to achieve higher data rates or improvements in overall system capacity. Amplitude variations in the modulated waveforms give rise to distortion products when applied to nonlinear components of the transmitter. Distortion emissions from mobile handsets are restricted to prevent system degradation and interference to users in adjacent cells.
Analog Dithering Techniques for Wireless Transmitters by Foad Arfaei Malekzadeh