By Foad Arfaei Malekzadeh
This booklet describes leading edge innovations and the theoretical heritage for layout and research of excessive functionality RF/Microwave transmitters. It introduces new, strong linearization/efficiency enhancement suggestions, acceptable to the entire switched mode strength amplifiers. Novel research equipment linked to those new innovations also are brought and helping size effects are documented. leading edge graphical illustration equipment are used to assist the reader comprehend the problem intuitively. purposes for the ideas mentioned are very large, starting from info convertors to RF/Microwave/mm-wave wireless/wire line transmitters. The authors have kept away from utilizing long formulation within the dialogue and feature used an intuitive and easy method of wade through the mandatory info. Readers will achieve priceless figuring out of the dither phenomenon, its mechanism, influence and undesired negative effects. the unconventional architectures brought are easy, don’t require complex DSP concepts and are effortless to implement.
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Additional info for Analog Dithering Techniques for Wireless Transmitters
11a, b. The first one is more suitable for discrete components while the second one can precisely model the integrated transistors. 2 Power and Efficiency The same basic types of power loss as in VMCD, exist here, but the main contributor to the loss is inductive loss ðLi2 f Þ; instead of capacitive. Like VMCD, there are two different approaches to find the voltage current waveforms of this kind of amplifier and eventually calculate the power loss, gain and efficiency. 2 Circuit Topologies Fig.
2 Random Input Describing Function According to central limit theorem , when we have a large number of uncorrelated input tones, the statistical behavior approaches a Gaussian distribution. This property is used to drive Random Input DF. Gaussian processes have two types: real and complex: real Gaussian processes, like the additive white Gaussian noise, have a Gaussian distribution for their value in time domain. A complex Gaussian process is an orthogonal summation of two real Gaussian processes.
Methods that yield higher accuracy, but take a long amount of simulation time are not useful in the first design phase and development of new products. Thus, tradeoffs are made when selecting an analysis method to assist in the assessment of transmitter linearity and efficiency. Furthermore, the dithered system that is studied in this book is much more complicated than an ordinary class AB amplifier and two different kinds of distortion exist, which can be categorized as spurious distortion and inherent distortion, originating from an equivalent nonlinearity function.