By Foad Arfaei Malekzadeh
This ebook describes cutting edge thoughts and the theoretical history for layout and research of excessive functionality RF/Microwave transmitters. It introduces new, powerful linearization/efficiency enhancement recommendations, acceptable to all the switched mode energy amplifiers. Novel research tools linked to those new innovations also are brought and helping size effects are documented. cutting edge graphical illustration tools are used to aid the reader comprehend the problem intuitively. functions for the innovations mentioned are very wide, 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 straightforward method of struggle through the mandatory info. Readers will achieve important figuring out of the dither phenomenon, its mechanism, influence and undesired unintended effects. the unconventional architectures brought are uncomplicated, don’t require advanced DSP options and are effortless to implement.
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Additional resources for Analog Dithering Techniques for Wireless Transmitters
The base band complex envelope has Gaussian real and imaginary parts as r variable above, then the problem would be different. Assuming that the input complex envelope is er ¼ r1 þ jr2 , while the input signal is modulated in the form: À Á r ¼ real er ejxt ; er ¼ r1 þ jr2 And rr1 ¼ rr2 ¼ prrﬃﬃ2 where r1 and r2 are in-phase and quadrature parts of the input signal and both are real zero-mean Gaussian variable, then the in-phase and quadrature equivalent nonlinearities can be achieved through two dimensional Fourier expansion as follows: Z Z 2p 1 g0I ðr1 ; r2 ; AÞ ¼ 2 yðr1 cosðh1 Þ þ r2 sinðh1 Þ þ Asinðh2 ÞÞ cosðh1 Þdh1 dh2 2p 0 ð3:22Þ 1 g0Q ðr1 ; r2 ; AÞ ¼ 2 2p Z Z 2p yðr1 cosðh1 Þ þ r2 sinðh1 Þ þ Asinðh2 ÞÞ sinðh1 Þdh1 dh2 0 ð3:23Þ And for the sinusoidal part the second term of the integrand is sinðh2 Þ, and all of the above is written again for static single valued nonlinearity.
The power efficiency is achieved accordingly as the ratio of the output power to the total dc power loss. 6 Intrinsic Parasitic Capacitance Effects The intrinsic capacitive parasitics are very important, because, apart from capacitive loss, they affect the dynamic transfer function and the describing function behavior of the device. They can contribute to the memory effect discussed in Chap. 6. In a real scenario, when we need to get enough power from a CDA with a low supply voltage; we have to scale up the channel width to decrease the ON resistance of the device to make the available power higher.
The formulas and concepts introduced will be used in the following chapters for analysis and simulation. References 1. Gelb A, Velde WEV (1968) Multiple-input describing functions and nonlinear system design. McGraw-Hill, New York 2. Atherton DP (1975) Nonlinear control engineering. Van Nostrand Reinhold Co, New York, London, full edition 1975, student edition 1982 3. Taylor JH (1977) An algorithmic state-space/describing function technique for limit cycle analysis, IFAC symposium on multivariable technological systems, Fredericton, Canada, July 1977 4.
Analog Dithering Techniques for Wireless Transmitters by Foad Arfaei Malekzadeh