By Aleksandar Tasic, Wouter A. Serdijn, John R. Long
With 1000000000 – quickly to be billion - mobile phones in stream, the subsequent problem is to make mobile radio features adaptive to their atmosphere. This ebook presents a entire theoretical framework for optimizing functionality, discussing joint optimization of Noise determine and enter Intercept aspect in receiver platforms. additionally tested are unique recommendations to optimize voltage managed oscillators and low-noise amplifiers, minimizing strength intake whereas protecting sufficient method functionality.
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Extra info for Adaptive Low-Power Circuits for Wireless Communications (Analog Circuits and Signal Processing)
2: High-IF spectral conversion. Here, f0 stands for the local-oscillator (LO) frequency, fRF the frequency of the desired signal, fIM the image-signal frequency, and fINT the frequency of the nearby (adjacent-channel) interferer. If f0
The role of an analogue RF front-end is to downconvert a signal received by a receive antenna to a digital back-end. The receiver architecture is called a high-IF architecture [1,2,10-22] if an intermediate frequency (IF) prior to the back-end processing unit doesn’t fall into the range of the baseband signalprocessing capabilities of the current era (tens of MHz at the time of writing). , on the order of kHz and/or MHz at the current era). The system-level design considerations for these architectures will be outlined in the following sections.
29) , 2. 29) where *OPT is the optimum reflection coefficient corresponding to the optimum source admittance that provides the minimum noise factor, and *S is the source reflection coefficient. The noise parameters, FMIN, RN, and *OPT, are characteristics of the device, and they can be measured with a noise-figure test set, or determined from the device S-parameters. Another noise figure of merit is the noise temperature, TE . By referring to Fig. 4, we can establish the relationship between the noise factor and noise temperature as follows.
Adaptive Low-Power Circuits for Wireless Communications (Analog Circuits and Signal Processing) by Aleksandar Tasic, Wouter A. Serdijn, John R. Long