SSeimensA unit of electrical conductance named after German Ernst Werner von Siemens (thanks for the correction, Dr. Bill!)
S-PARAMETERSscattering matrix parametersThe most commonly used descriptors of a microwave n-port network. See also our page on SNP (S-parameters for n-port networks).
SAGself-aligned gate--
SARsynthetic aperture radar--
SASsuspended air stripline--
SATCOMsatellite communicationsNot an acronym, satcom is a portmanteau.
SAWsurface acoustic waveA phenomenon where electrical energy is converted to a physical displacement on the surface of a solid, similar to a sound wave.
SCshort circuitOpposite of open circuit.
SDRsoftware-defined radio--
SEMscanning electron microscopeA great toy for seeing stuff smaller than a wavelength of light (<~1 micron).
SFDRspurious-free dynamic rangeA measure of the range of amplitudes that a receiver can process.
SHMSub-harmonic mixerA mixer that internally multiplies the LO signal, usually 2X
SIsemi-insulatingAs in a GaAs wafer that has no semiconductor grown on it.
SICsilicon carbideOne of the possible wafers for growing gallium nitride devices (others include silicon, sapphire, and diamond).
SIGEsilicon germaniumThe great white hope of major silicon IC manufacturers for microwave devices (notably IBM).
SILCstress induced leakage current--
SINADsignal plus noise plus distortion, to noise plus distortion ratioThis is a new one on us!
SIRsignal to interference ratio--
SITstatic induction transistorA new microwave semiconductor device with a buried gate.
SIWsubstrate integrated waveguideA way to make dielectrically-loaded transmission lines on a single-layer substrate.
SLCsingle-layer capCapacitor usually used in chip-and-wire construction, has excellent microwave properties.
SMAsubminiature type AA ubiquitous microwave connector.
SMDsurface mount deviceAs opposed to a "through-hole" device.
SMMICsub-millimeterwave MMICA MMIC component that performs above 300 GHz.
SMTsurface mount technologyWhen parts are soldered to the top surface of a board, without leads soldering into through-holes. Generally, all microwave PWBs use SMT because it offers better impedance control.
SNAscalar network analyzerUsed to measure return loss and gain, magnitude only.
SNAFUsituation normal, all f**ed upOne of two excellent acronyms that are the legacy of the greatest generation (see fubar).
SNFSpherical near fieldA type of antenna measurement
SNRsignal-to-noise ratio--
SOAsafe operating areaThe combination of voltage, current, and temperature where you don't blow up your expensive power transistor.
SODsource-over-drainA layout option for multi-finger power FETs.
SOGsource-over-gateA layout option for multi-finger power FETs.
SOIsecond-order intercept--
SOICsmall outline integrated circuitA type of package
SOLTshort-open-load-throughA type of network measurement calibration.
SOTsmall outline transistorA type of package
SOTAsate-of-the-artPerhaps one of the most overused acronyms in engineering.
SOWstatement of workIn a contract, a list of the stuff you have to do to get paid.
SP3Tsingle-pole, three throwA switch with one input and three outputs, or vice-versa.
SPCstatistical process control--
SPDTsingle-pole, double throwA switch with one input and two outputs, or vice-versa.
SPISerial peripheral interfaceCommonly used to send data from a controller to a peripheral
SPSTsingle-pole, single throwThe simplest possible switch.
SRFSelf-resonant frequencyA parameter that you need to specify when you order lumped element components.
SRRsplit ring resonatorA technique used to realize metamaterials.
SSsmall-signalLow-enough power level where linear operation is assured.
SSBsingle-sidebandA type of receiver or downconverter that eliminates one sideband.
SSGsmall-signal gainOutput power divided by input power, at a signal level that does not compress the gain.
SSMAsub-subminiature type AA rarely used type of microwave connector.
SSPAsolid-state power amplifier--
STALOstable local oscillator--
STARsimultaneous transmit and receive--
STCsensitivity time controlAnother way to say "gain control". Thanks to Frank!
STEspecial test equipmentDedicated test equipment for a high-value job.
SUVsmall unit verification--
SWAGscientific wild-assed guessSlightly more accurate than a WAG. Thanks to Doug!
SWAPsize, weight and power--
SWAP-Csize, weight and power and cost--
SWAPPsize, weight and PowerPointYes, we made this up.
SWRstanding wave ratioAn arcane way of specifying impedance mismatches, dating back to the old days when the old guys used standing wave meters because they didn't have network analyzers. You'll still hear people talking about "2:1 VSWR over all phase angles" instead of 10dB r
Author: Unknown Editor