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Figure 93 A standard linear transmitter
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IMD) and to maintain a good BER The SSPA must also be exceptionally stable, and not begin oscillating nor decrease power with the wide impedance variations encountered in a mobile or portable operation The impedance variations are caused by the antenna being constantly presented with many conducting structures that are passing nearby within the mobile environment As well, the driver amplifier must be able to supply the necessary input signal amplitude to the SSPA, and without significant distortion levels The TX BPF must be tight enough to attenuate the LO feedthrough, the undesired sum or difference frequency, and other mixer products but not contribute significantly to the signal s group delay variations nor amplitude ripple The wideband amplifier is not always required, but will permit all the undesired mixer products to pass through to the TX BPF, where they are reflected back toward the mixer stage The wideband amplifier, because of its high isolation, will attenuate most of these reflected signals so that they do not create increased IMD levels within the mixer Many transmitter designs may suppress reflections from the TX BPF s stopbands by use of a diplexer or attenuator pads, or may simply dispense with all of the above and place the TX BPF directly at the output of the mixer port This choice will depend on the output power from the mixer; the less output power, the lower in amplitude the reflections, and the less the requirement for their suppression (These mixer products reflect back into the diode ring of a passive mixer stage, causing mixer diode imbalance; with the resultant increase in spurious outputs and decreased third-order intercept points) The second mixer itself can be a double-balanced type, of a level 10 (10 dBm LO power) or higher, to suppress IMD Typically, the IF input port to the mixer should never have a signal higher than 10 to 15 dB less than that at the LO port, or excessive intermodulation products will result As an example, if the LO port is at 10dBm, then the IF input must be at or lower than 0 dBm The 3-dB pad located at the LO port helps to present a 50-ohm impedance to the sensitive LO BPF This LO BPF suppresses LO harmonics, which lowers mixer IMD, as well as wideband noise, which improves the mixer s NF The synthesizer amplifier, SYNTH AMP, buffers the output of the synthesizer, minimizing VSWR, as well as increasing the synthesizer s output power to the mixer s nominal level to maintain its rated noise figure, IMD, and conversion loss specs The synthesizer stage itself should have high stability and low phase noise so as not to degrade the downstream receiver s SNR and BER The 3-dB pad at the input to the second mixer may be used to maintain a more even 50ohm input impedance for the IF BPF, which will shift in characteristics if not presented with its design impedance The IF BPF should be tight enough to reject the first mixer s products, its sum (or difference) frequency, the LO feedthrough, and excess noise (since increased bandwidth also increases input noise), yet loose enough to minimize group delay variations and sideband cutting Selection of the proper filter topology, each with its own positive and negative attributes, is vital (see Chap 6, Filter Design ) The wideband IF amplifier stage, IF AMP, not only does amplification chores, but will also have high reverse isolation to prevent the mixer products
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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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