Modern Communications Receiver Design and Technology by Cornell Drentea
By Cornell Drentea
This entire 462 pages textbook and reference with reference to radio frequency (RF) receiver layout provides the innovations, arithmetic and layout for such platforms. Chapters contain discussions on superheterodyne receivers, dynamic diversity, mixers, advanced coherent frequency synthesizers, automated achieve regulate and beat frequency oscillators and extra sections disguise complex subject matters like electronic sign processing (DSP) and software program outlined radios (SDR) in addition to digital conflict (EW) receivers. meant for electric engineering scholars and engineers, this complete quantity includes 360 illustrations together with complicated block diagrams, photos and schematics. Drentea is an electric engineer with fifty years of expertise within the box of RF engineering and has labored for the army Avionics and company divisions of Honeywell and Hughes/Raytheon platforms.
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Extra resources for Modern Communications Receiver Design and Technology
Example text
However, a good knowledge of protocols will help designers understand where receiver and filter technologies fit in the big picture. Although not directly connected with receivers, we will briefly discuss the ISO-OSI communications model. In 1978, the International Organization for Standardization (ISO) introduced a high-level methodology of classifying the many aspects of end-to-end communications. This is the seven layer Open System Interconnection (OSI) model, a concept for developing communications between heterogeneous devices.
Once in the IF, the image component cannot be removed by any means. Rejecting image has to be resolved before the first mixer or in the first mixer circuitry. An RF receiver or transceiver system should be designed to reject image over its total RF input bandwidth. This is relatively simple in narrowband (NB) RF systems, but it can be very complex or sometimes impossible in wideband (WB) systems depending on the RF input bandwidth requirements and the IF choice. The wider the RF front end bandwidth is, the more complex the image rejection mechanism will become (as we will see later in Chapter 14).
The rest of the circuitry remains the same, as described previously. However, we have a new problem, the image. 3. 4. 5. In this design, the signal from the antenna goes to switch S11, which couples it with any one of the five preselector tuned circuits, corresponding to the five bands in this case. Switch S1-2, which is mechanically ganged with S1-1, picks up the output of the preselector range chosen. Together with the variable capacitor, which is always in the circuit, the chosen range tracks the exact frequency to be received, which is exactly 455-kHz below the frequency of the VFO.