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Proper transmitter design is critical, since it is a device that radiates an electromagnetic signal This signal can, if the transmitter is improperly designed or constructed, interfere not only with other wireless communications, but also with many different types of non-RF electronic equipment Harmonic and spurious outputs, wideband noise and phase noise, frequency and amplitude stability, and the signal s peak and average output powers are but a few of the critical parameters that must be addressed before any transmitter design can begin Spurious signals generated by the mixing of the LO and IF (along with their harmonics) are of particular concern, as are twotone intermodulation products created by two or more frequency components mixing together in any nonlinearities at least up to the fifth order (3F1 2F2
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or 3F2 2F1) Other undesired output signals, such as harmonics of the desired RF carrier signal and the feedthrough of the LO and IF, can all cause interference Transmitted noise (especially in a multipoint environment) will raise the noise floor of the receiver at the other end of the link, lowering its SNR, which will decrease the distance the communication link can reach; so any Class A or Class AB power amplifier should be specifically designed to output a minimal amount of additive wideband noise Depending on the frequency, power, band, modulation, and service, certain frequency-stability requirements are mandated by law, or are simply required for proper demodulation at the receiver and/or to prevent adjacent channel interference
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922 Transmitter design
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The generic linear double-conversion transmitter of Fig 93 could just as easily be a single-conversion unit The choice as to whether to employ single or double conversion is based on the transmit RF frequency and the much lower input frequency At higher RF operation, double conversion is required to properly suppress, through low-cost IF filtering, the close-in sum or difference frequencies of the input signal mixing with the LO, as well as the LO feedthrough, while also suppressing spurious mixer responses caused by the limitations of a real-life IF filter s limited realizable percentage of bandwidth In other words, if we desire a high transmitter RF output frequency with only a single conversion stage yet we have a low input frequency that must be converted to this much higher carrier frequency we would need a filter with an impossibly narrow bandwidth and ultrasteep skirts, along with the escalating problem of the inevitably high group delay variations that would severely distort the output signal Taking the first element of Fig 93, the antenna, we see that it is at DC ground through the inductor to protect the RF output filter (RF BPF) and the solid-state power amplifier (SSPA) against static buildup discharge damage The RF BPF suppresses much of the transmitter-generated harmonics, wideband noise, IMD products, and out-of-band conversion frequencies As an added consideration in FM service, most of the SSPAs will run saturated for maximum efficiency, which will create large harmonic output levels; these harmonics of the fundamental must be sufficiently attenuated by this last RF output filter In fact, since the output filter is typically reflective in the stopbands, most of these undesired harmonic frequencies are actually reflected back into the SSPA, which will then create significantly higher-than-expected harmonic output from the transmitter This annoying effect will necessitate an increase in the rated attenuation of the RF output filter by approximately 15 to 20 dB If the SSPA is to be operated at less than saturation for digital or SSB voice communications, it must be designed to maintain the desired output power with low distortion levels for the RF signal This means we may have to run the power amplifier at up to 10 dB (or more) under its maximum output power rating To put it another way, the SSPA has been backed-off in power by up to 10 dB in order to maintain the required linear operation that a particular modulation technique demands for decreased spectral regrowth (a form of
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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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