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Microwave Acronyms - I

Updated July 19, 2009

A B C D E F G H I J K L M

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IC

integrated circuit

What MLK was talking about in his "I have a dream" speech.

ICD interconnect diagram A type of block diagram.

ICP

Insane Clown Posse. No, just kidding, inductively-coupled plasma

A musical group that you don't want your daughter to be a groupy for? actually, a great way to etch via holes in GaAs substrates.

ID inside diameter The inside dimension of a cylinder.

IDS

drain-source current The channel current in an FET.
IDSS saturated drain source current logical people think this should be abbreviated"SDSC"
IEC an international standards group  

IEEE

Institute of Electrical and Electronics Engineers

A stuffy organization that many people join to get a good group insurance rate. The subgroup MTT-S publishes a lot of excellent but hard-to-read microwave-related papers.

IF

intermediate frequency

The output frequency of a down converter.

IIP2, IIP3 input third order intercept point The intercept points, referenced to the input.

IL

insertion loss

 

IMAX maximum current for a FET Maximum FET channel current,typically measured at +0.5 volts VGS and +1 volt VDS.
IM intermodulation  
IMD intermodulation distortion Often refers to "TOI".
IMP intermodulation products  
IMR intermodulation ratio The difference in magnitude of observed during two-tone IMD measurements.

IMPATT

impact avalanche and transit time

A nearly forgotten diode technology that offered great promise for supplying high power at millimeter wavelengths.

InP indium phosphide A III-V compound semiconductor suitable for frequencies up to and beyond 100 GHz.
IIP3 input third order intercept point Same as ITOI.

I/O

input/output

Not to be confused with what that Chinese engineer says every time you blow up one of his FETs.

IP intellectual property What you try to protect with a patent.

IP2

second order intercept point

 

IP3

third order intercept point

 

IQ

intelligence quotient

Here are the official categories for your stupid coworkers (be sure to always use the proper term!)

Idiot (IQ 60-80)

Imbecile (IQ 40-60)

Moron (IQ <40)

I-Q

in-phase/quadrature

As in "IQ modulator".

IRM

image reject mixer

 A mixer that removes the image frequency contribution from the IF.

ISV individual source vias The best possible grounding scheme for power FETs, usually required 2-mil substrates.
ITAR international traffic in arms regulations A set of regulations in the United States that controls the export of data that is critical to military programs.
ITOI input third order intercept Same as IIP3.

 


 
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