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Second-order intermodulation distortion (IM2) has become an issue with the relatively new proliferation of wideband communications systems, especially direct conversion and low IF receivers, and includes the generation of spurious frequencies at f1 + f2, 2 f1, 2 f2, or f1 f2 when two signals, f1 and f2, are present within the receiver These spurious frequencies can be created by either the intermodulation distortion between an interferer (f2) and the desired signal (f1), or by two interferers (f1 and f2), falling in-band For instance, if we had two signals coming into a wideband receiver at 400 MHz (f1) and 401 MHz (f2), then one of the IM2 products generated by the combination of these two signals would be located at 801 MHz ( f1 + f2) Due to their extreme distance from the typical receiver s bandpass, these second-order signals would be filtered out of any narrowband receiver However, in a modern wideband radio that possesses a very wide RF preselector (or no preselector at all) one of these f1, f2 frequency combinations may indeed create interference that falls in the receiver s IF bandpass Such IM2 interference can be virtually eliminated if the receiver s RF front end can be sub-octave bandpass filtered These IM2 frequencies increase in amplitude versus the fundamental by a ratio of 2:1 Therefore, if we increase the desired signal level by 10 dB, then the IM2 products will increase by 20 dB The measurement of the second-order intercept point itself is considered to be the point where the two original signals and the spuriously generated second-order products would theoretically meet on the device s PIN versus POUT curves (see ThirdOrder Intermodulation above)
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Harmonic distortion occurs when an RF fundamental sine wave (fr) is distorted due to nonlinearities within a circuit, generating undesired harmonically related frequencies (2 fr, 3 fr, and so on) Interference to receivers tuned to many megahertz, or even gigahertz, away from the transmitter s output frequency is possible when these harmonics are broadcast into space (Fig 319) The dominant cause of transmitted harmonics is overdriving a poorly filtered power amplifier, with an extreme case of distortion resulting in the sine wave carrier actually changing into a rough square wave These nonperfect square waves contain not only the fundamental frequency, but numerous odd harmonics, as well as a certain amount of even harmonics
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FIGURE 319 Harmonics in the frequency domain
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No active stage can be completely linear, with an inevitable number of harmonics being produced within all amplifiers In a transmitter, these harmonics must be attenuated below the legal or system limits
Noise
There are two principal classifications of noise: circuit generated and externally generated Both limit the possible sensitivity and gain of a receiver, and are unavoidable, but can be minimized Circuit noise creates a randomly changing and wide frequency ranging voltage There are two main causes: white noise, created by a component s electrons randomly moving around due to thermal energy, and shot noise, caused by electrons randomly moving across a semiconductor junction and into the collector or drain of a transistor External noise, produced by atmospheric upheavals like lightning, as well as space noise caused by sunspots and solar flares, and cosmic noise created by interfering signals from the stars, is exacerbated by man-made electromagnetic noise sources such as dimmer switches, neon lights, car ignitions, and electric motors
Small-Signal Amplifier Design
341 Introduction
Small-signal amplifiers, which are always biased in their linear region, are needed to increase the tiny signal levels found at the input of a receiver into usable levels for the detector, or into the proper levels required for a transmitter s final power amplifier A microwave receiver s first RF amplifier will be of the Class A small signal, high gain type It must not produce excessive noise, since any noise generated within this first stage will be highly amplified by later stages, decreasing the signal-to-noise ratio (SNR) There are four vital considerations in any discrete RF amplifier design: the choice of the active device, the input and output impedance matching network, the bias circuit, and the physical layout Each of these will be discussed in detail
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