active barcode excel 2010 Sideband cutting If a receiver s IF filters are too selective they may actually attenuate the in Software

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desired sidebands of a signal, thus distorting the higher detected audio frequencies or increasing the BER in a digital system
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Signal-to-noise ratio (SNR) The ratio between the signal voltage or power, to the noise voltage
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or power, expressed in dB
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Simplex operation In wireless communications, simplex refers to the successive
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communications between two transceivers on the same frequency, but not at the same time and without the use of a repeater
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Sinking current When an integrated circuit has current flowing into its I/O pin (see
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Sourcing current)
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Skin effect At high frequencies a conductor s effective resistance increases, caused by the RF currents being forced to travel closer to the conductor s surface by the higher reactance deeper within the metal The skin effect, sometimes referred to as RF resistance, will create higher elevated losses to microwave signals than may have been expected during simple calculations for resistance, reactance, or impedance Smith chart Once the dominant graphical method employed to assist engineers in the rapid design of RF-matching networks between two dissimilar complex impedances The Smith chart comprises constant resistance circles and constant reactance arcs Indeed, before the PC and the handheld calculator, working with even the simplest RF-related complex math equation was a painfully slow and monotonous procedure Philip H Smith of Bell Labs solved this problem with the advent of his now well-known nomographic chart, which permitted engineers to perform calculations that normally took a slide-rule, paper, pencil, and a significant expenditure of brainpower and time to perform These same calculations now took only moments, and with significantly less chance of mundane errors creeping into the final result In fact, the Smith chart is still used today, mainly within software as opposed to on paper, to graphically view an RF circuit s impedances, scattering parameters, reflection coefficients, unconditional stability, noise figure, constant gain, return loss, and VSWR, as well as to still assist some engineers in the design of RF-matching networks and to work with transmission lines Smith charts are a standard display option in almost any piece of microwave test equipment or RF simulation software that works with complex impedances Snubber A series resistor and capacitor network, or an RC parallel tank with a series diode,
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as well as other RCD combinations, that can be used to damp out or absorb voltage overshoots and ringing in an inductive circuit, thus preventing semiconductor damage and EMI Snubbers work by controlling the transient voltage s maximum rate of change
Sourcing current
current)
When a circuit has current flowing out of its I/O pin (see Sinking
Space diversity Two antennas separated by distance in order to mitigate multipath effects: If one antenna is receiving the faded signal, the other antenna will hopefully be receiving a higher amplitude signal, and the antenna with the strongest signal is then chosen for amplification by the digital receiver (there are additional antenna diversity methods) Spectrum The complete range of electromagnetic waves from sound waves to x-rays The section of the electromagnetic spectrum of interest in most wireless communications is between 20 kHz (VLF) and 100 GHz (EHF) Spread The tolerance variation of a device s characteristics For instance, a JFET may be rated
as having a IDSS of 12 mA, but may really have a IDSS of anywhere between 9 and 15mA
Spurious emissions Referred to as spurs, these are interfering and undesired frequency
emissions that are inside or outside of the bandpass of a transmitter or receiver
Spurious free dynamic range (SFDR) The dynamic range of a receiver from its smallest detectable signal to the highest amplitude signal in which, after the injection of a two-tone
Glossary
input signal, there are no third-order or spurious products greater than 3 dB above the noise floor, measured in dB SFDR can be increased by raising the receiver s IIP3 and lowering the receiver s noise figure or IF bandwidth, and can be calculated by:
SFDR (dB) = 066(IIP3 NF 10 log(BW) + 171) where IIP3 = receiver s third-order input intercept point, dBm NF = receiver s input noise figure, dB BW = bandwidth of the receiver s IF, Hz String
A number of series connected amplifiers or frequency multipliers
Stub tuner A device that permits the convenient manual adjustment of its input/output
impedances A stub tuner can be used to temporarily match, or to purposefully mismatch (to test for stability), a source to its load The device consists of two or three (double stub or triple stub) movable short-circuited metallic stubs that transform its input/output impedances to almost any value The entire instrument looks similar to a trumpet, and can be placed in any RF environment that possesses a standard RF connector, such as an SMA, N, or 7 mm A variety of different model tuners are available that can cover specific frequency ranges between 03 and 18 GHz, with the most popular units being manufactured by Maury, Inc
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