Download Analog Dithering Techniques for Wireless Transmitters by Foad Arfaei Malekzadeh PDF
By Foad Arfaei Malekzadeh
This publication describes leading edge strategies and the theoretical heritage for layout and research of excessive functionality RF/Microwave transmitters. It introduces new, powerful linearization/efficiency enhancement options, acceptable to the entire switched mode strength amplifiers. Novel research tools linked to those new suggestions also are brought and helping dimension effects are documented. leading edge graphical illustration equipment are used to assist the reader comprehend the problem intuitively. purposes for the options mentioned are very vast, starting from facts 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 battle through the mandatory details. Readers will achieve necessary figuring out of the dither phenomenon, its mechanism, impact and undesired unintended effects. the radical architectures brought are basic, don’t require complex DSP options and are effortless to enforce.
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Envelope tracking is also applicable to the load and supply voltage. Therefore the architectures can be categorized as closed and open loop, and with or without envelope modulation. All the options for a linearized quantizer are depicted in Fig. 2. , if the output is high power they system is a linearized switched mode PA, but if the nonlinear block is a binary quantizer, at low power, it is only a time domain encoder. 1 Open-Loop This method includes the forward path of Fig. 2a. The linearity issues will be discussed in Chap.
Sc. Book, Department of Electrical and Computer Engineering University of California, Santa Barbara, CA 93106–9560 May 2003 6. El-Hamamsy S-A (1994) Design of high-efficiency RF Class-D power amplifier. IEEE Trans Power Electron 9(3):297–308 7. Johnson T et al (2007) CMOS RF class-D power amplifier with bandpass sigma-delta modulation. Microelectron J 38(3):439–446 8. Chowdhury D, Thyagarajan SV, Ye L, Alon E, Niknejad AM (2011) A fully-integrated efficient CMOS inverse Class-D power amplifier for digital polar transmitters.
1 Sinusoidal DF In the following sections, first SIDF is derived and methods of calculation are discussed. , AN , r , B) Fig. 1 Single Sinusoidal DF For a sinusoidal input, based on equation, the left hand side of Eq. 1 Sinusoidal DF 29 Fig. 4 Illustration of the concept of SIDF, residual yr and correlated part y1 ; The total output is sum of correlated and uncorrelated parts Nq ¼ 2 yð0Þcosh A ð3:7Þ For any odd single valued nonlinearity, the quadrature gain Nq is zero [7], and the same is true for any combination of a sinusoid and another statistically independent signal.