Analog Dithering Techniques for Wireless Transmitters - download pdf or read online

By Foad Arfaei Malekzadeh

ISBN-10: 1461442168

ISBN-13: 9781461442165

This ebook describes cutting edge ideas and the theoretical historical past for layout and research of excessive functionality RF/Microwave transmitters. It introduces new, strong   linearization/efficiency enhancement ideas, appropriate to all the switched mode energy amplifiers. Novel research tools linked to those new recommendations also are brought and assisting size effects are documented.  leading edge graphical illustration tools are used to assist the reader comprehend the problem intuitively.  purposes for the innovations mentioned are very huge, 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 wade through the required details.  Readers will achieve useful figuring out of the dither phenomenon, its mechanism, impression and undesired unintended effects. the unconventional architectures brought are basic, don’t require complex DSP innovations and are effortless to enforce.

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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. In: Radio Frequency Integrated Circuits Symposium (RFIC), 2011 IEEE, pp 1–4, 5–7 June 2011 9. Piessens T, Steyaert MSJ (2005) Behavioral analysis of self-oscillating class-D line drivers. IEEE Trans Circuits Syst I Reg Papers 52(4):706–714 10. Odavic M, Sumner M, Zanchetta P, Clare JC (2010) A theoretical analysis of the harmonic content of PWM waveforms for multiple-frequency modulators.

5 Possible Dithering Locations Dithering can be applied to the architecture in two different positions. One is the input to the amplifier as in Fig. 2a and another one is to the control input of the adaptive load tuner, as in Fig. 2b. 1 Architecture Level Considerations 41 Y( j ) Spurious Single SMPA 1 0 0 fr fd r(t) BALUN1 BPF1 d(t) 2M. fr f fd fd 2fr M. fr M. fd 2 fr M. fd BALUN 2 Y( j ) 180 180 Spurious Common SMPA 2 fr M. fd 2. fr M fd 2 fr M. fd f Fig. 3 Common mode dithering scheme, with two identical switch mode power amplifiers (SMPA1,2) the fundamental output dither will be common mode, resulting in a relaxed filter order requirement dithering are both possible, while in the latter, only high frequency dithering can be used, to linearize the system.

Therefore, with and without feedback and with envelope modulation, we have to modulate the amplitude of the dither signal: d ðtÞ ¼ D0 ð1 þ aj~r ðtÞjÞ ð4:1Þ Any time difference between the supply modulation and dither modulation will cause additional distortion. 2 Tracking with Closed Loop Similar condition holds for linear performance of the closed loop. A method to omit dither modulation is used in a self-oscillating class-D PA (Chap. 7). In that case, the dither level, which is the sinusoidal oscillation that is automatically generated in the loop, will keep the loop linear.

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Analog Dithering Techniques for Wireless Transmitters by Foad Arfaei Malekzadeh


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