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The most difficult-to-design element in any communications system is the receiver A receiver must have a low noise figure (at VHF and above), low group delay variations and IMD, high dynamic range, stable AGC, appropriate RF and IF gain, good frequency stability, satisfactory gain flatness across multiple channels, low phase noise, negligible in-band spurs, sufficient selectivity, suitable BER and sometimes the most critical specification of all be within certain cost constraints An important concern of any superheterodyne receiver is the image frequency, in that any signal received within this image band will be amplified by the receiver s IF stages and then be unavoidably transferred on to the demodulator to be output as interference This image frequency can be eliminated only at the front end of a receiver, before down-conversion, by a filter that blocks the interfering frequency: the image filter When the local oscillator is higher in frequency than the incoming RF signal (high-side injection), the image is any frequency that is at twice the IF plus the desired RF signal frequency [(2 IF) RF], or at the IF plus the LO frequency (LO IF) If the
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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local oscillator is lower in frequency than the incoming RF signal (low-side injection), then we can find the image frequency by (2 IF) RF or LO IF Taking the first case, high-side injection, the image is any signal (or even noise at that frequency) that differs from the LO by the amount of the IF just as the desired signal does but is higher instead of lower than the local oscillator Subtracting the desired signal from the local oscillator frequency will give the IF, which will, of course, easily pass through the receiver s IF amplifiers But any frequency (the image) that is higher than the LO by exactly the same amount that the signal is below the LO will give us the same frequency This same frequency will also easily pass through the IF amplifiers, and create interference and a decrease in the SNR As mentioned, the dominant technique for attenuating the image frequency is by front-end filtration The filtering can be further assisted by using as high an IF as possible to move the image as far away from the desired frequencies as possible This will make the filtering of the image a much easier task, with decreased risk of excessive group delay variations caused by a tight filter Maintaining this first image far from the desired frequency is assisted by utilizing double- or triple-conversion receiver designs With these multiple-conversion receivers, the first IF is at a high frequency, while the second and third IFs are much lower These lower IFs will supply most of the selectivity and gain, since the lower the IF, the more simple, stable, sensitive, and selective the amplifiers will be This is mainly due to the circuit s decreased stray capacitances and inductances at these frequencies, along with less of a requirement to employ special high-frequency components We will address typical receiver and transmitter system design issues, the communications link and its impairments, and the communications system as a whole
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Most receivers are of the down-conversion type, which takes the RF input and immediately begins to convert it either to a single lower IF or down to two or more increasingly lower IFs The other type of receiver, called the up-converting superhet, is operated in wide-tuning-range applications, and is especially dominant in HF SSB ham radios It takes the incoming RF and converts it to some higher frequency typically about twice the highest expected receive frequency to distance the image frequency from the LO to assure simple RF front-end filtering Up-converting is rarely seen at VHF and above A standard double down-conversion superhet receiver block diagram is shown in Fig 91 First, the antenna picks up the electromagnetic waves from the environment and, because of its natural passive gain, amplifies any signals that are within its bandwidth The inductor L1 short-circuits static buildup on the antenna to ground to prevent it from entering, and possibly damaging, the delicate LNA of the receiver s front end L1 can also be an inductor within BPF1 The signal is amplified by the antenna and sent into the input of the receiver s BPF1 BPF1 is a filter sometimes called a preselector, and is utilized
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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