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Figure 311 IMD generation through an overdriven or nonlinear amplifier
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MHz, with the most destructive frequencies being, of course, at 105 MHz and 111 MHz This is well within the passband of this particular receiver Much higher order IMD is created in receivers and amplifiers, so all IMD up to the seventh order should be accounted for and, if it does fall within band, must be at such a low amplitude that it cannot cause problems A low return loss (a high VSWR) can also create IMD in an amplifier or mixer stage because of the reflected waves from the next stage returning and mixing with the output and its sidebands Harmonic distortion occurs when an RF fundamental sine wave (fr) is distorted by nonlinearities within a circuit, generating undesired harmonically related frequencies (2 fr, 3 fr, etc) 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 312) 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 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 No amplifier can be completely linear, so a number of harmonics are inevitably produced within all amplifiers, and they must be attenuated as much as possible especially in a transmitter
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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 by thermal energy (heat); and shot noise, caused by electrons randomly moving across a semiconductor junction and into the collector or drain of a transistor
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Figure 312 Harmonics in the frequency domain
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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
Amplifier design considerations Since the data sheet is the dominant source of information circuit designers have for selecting an active device for their own specialized applications, it is especially important to understand data sheet parameters as they apply to RF transistors Check out the device s data sheet with your design to confirm that current, voltage, and power limitations will not be exceeded in your wireless application; whether in a nonsignal DC condition or under a maximum signal situation Obviously, the transistor s fT, P1dB, and GA(MAX) (maximum available gain) and, for low-noise amplifier (LNA) applications, the NF, are all vital specifications The near maximum output power possible in an amplifier is the 1-dB compression point (P1dB) This is the area where a linear amplifier begins to run out of room for its maximum output voltage swing Any amplifier will have what is generally considered as a linear POUT until it reaches this P1dB point, which occurs when a high enough input signal is injected into the amplifier s input At P1dB, the gain of the amplifier will depart from the gain displayed at lower input powers (Fig 313), and for every decibel placed at the amplifier s input, no longer will there be a linear amplification of the signal The output gain slope flattens, and soon no significant increase in output power is possible
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