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What level of RF is dangerous?

What is radiofrequency (RF) radiation? Radiation is the emission (sending out) of energy from any source. X-rays are an example of radiation, but so is the light that comes from the sun and the heat that is constantly coming off our bodies. Wh

Posted on:05-22 View:30
Understanding Spread-Spectrum RF Communication

Learn about an interesting technique that can make wireless communication more robust and reliable. Throughout this book, we have visualized RF signals as both waveforms in the time-domain and distinct shapes in the frequency domain. These shapes are often rather tall and narrow

Posted on:05-22 View:50
Understanding Matching Networks

Learn about why matching networks are used and how they are designed. We discussed characteristic impedance, transmission lines, and impedance matching. We know that transmission lines have a characteristic impedance and we know that this impedance is an important factor in RF c

Posted on:05-22 View:40
Image Rejection and Direct-Conversion Receivers

In this page we’ll discuss the “image” problem in IF-based receivers, and we’ll also look at an alternative approach that eliminates this complication. In the previous page we explored benefits associated with the use of an intermediate frequency (IF). However, IF architectures

Posted on:05-22 View:34
The Benefits of an Intermediate Frequency in RF Systems

Learn about “IF”—a widespread and advantageous technique used in many wireless systems. Thus far, we have discussed RF signals in terms of two frequency bands: the baseband and the RF band. This approach provides a straightforward conceptual framework in which RF circuits are fu

Posted on:05-22 View:81
Quadrature Frequency and Phase Demodulation

Radio Frequency Demodulation This page explores the use of quadrature demodulation with frequency- and phase-modulated signals. From the previous page we know that quadrature demodulation produces two baseband waveforms that, when taken together, convey the inform

Posted on:05-22 View:78
Understanding Quadrature Demodulation

Radio Frequency Demodulation This page explains what quadrature demodulation is and provides insight into the nature of I/Q signals. If you have read the previous page, you know what I/Q signals are and how quadrature (i.e., I/Q-signal-based) modulation is accomplished. In

Posted on:05-22 View:64
Understanding I/Q Signals and Quadrature Modulation

Radio Frequency Demodulation Learn about “I/Q” signals, how they are used, and why they are advantageous in RF systems. This chapter would not be complete without a page on quadrature demodulation. However, before we explore quadrature demodulation, we need to at least brie

Posted on:05-22 View:91
How to Demodulate Digital Phase Modulation

Radio Frequency Demodulation Learn about how to extract the original digital data from a phase-shift-keying waveform. In the previous two pages we discussed systems for performing demodulation of AM and FM signals that carry analog data, such as (non-digitized) audio. Now w

Posted on:05-22 View:66
How to Demodulate an FM Waveform

Radio Frequency Demodulation Learn about two techniques for recovering the baseband signal from a frequency-modulated carrier. Frequency modulation offers improved performance over amplitude modulation, but it is somewhat more difficult to extract the original information f

Posted on:05-22 View:41

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