Adaptive Low-Power Circuits for Wireless Communications by Aleksandar Tasic, Wouter A. Serdijn, John R. Long

By Aleksandar Tasic, Wouter A. Serdijn, John R. Long

With 1000000000 – quickly to be billion - mobile phones in move, the subsequent problem is to make mobile radio services adaptive to their setting. This ebook presents a accomplished theoretical framework for optimizing functionality, discussing joint optimization of Noise determine and enter Intercept element in receiver platforms. additionally tested are unique strategies to optimize voltage managed oscillators and low-noise amplifiers, minimizing energy intake whereas conserving enough procedure functionality.

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55] W. Robins, Phase Noise in Signal Sources, London: Peter Peregrinus Ltd, 1982. [56] D. B. Leeson, “A simple Model of Feedback Oscillator Noise Spectrum”, Proceedings IEEE, pp. 329–330, February 1966. [57] T. S. Rappaport, Wireless Communications – Principles and Practice, pp. 120, Prentice Hall, INC, Upper Saddle River, NJ 07458, 2002. Chapter 3 SPECTRUM-SIGNAL TRANSFORMATION For the last few decades, there haven’t been significant breakthroughs at receiver system-level design, as frequently only a few architectures have been exploited: high-IF [1,2] and zero-IF topologies [3,4], and lately low-IF topologies [5].

7). 7) This condition reads as: the larger the P, the better the stability. Generally, figures expressed with S-parameters can be conveniently mapped and followed using Smith charts [10]. If there is feedback in a circuit, the stability criteria can be related to loop gain and loop phase shift [15]. 2 Matched Gain Parameters Referring to Eq. 1), we can distinguish between the gain factors of the source matching network gS, Eq. 8), of the designed two-port network (Fig. 1) g0, Eq. 9), and of the load matching network gL, Eq.

Parameters of the two-port network are the power gain g, the bandwidth B, and the noise temperature TE. The noise temperature of the source is T0. If the input noise power corresponding to the matched condition and temperature T0=290K equals NI=KT0B, the output noise power is NO KB (T0  TE ) g . 30) Now, the relationship between the noise figure and the equivalent noise temperature can be obtained by combining Eqs. 30) as F 1 TE T0 TE ( F  1)T0 . 31) The use of the noise factor is in some situations error prone.

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