| I/O | input/output | -- |
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| I/Q | in-phase/quadrature | As in "I/Q modulator", not the intelligence quotient of your colleagues. |
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| IC | integrated circuit | -- |
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| ICD | interconnect diagram | A type of block diagram. |
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| ICP | Insane Clown Posse | 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. |
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| ID | inside diameter | The inside dimension of a cylinder. |
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| IDS | drain-source current | The channel current in an FET. |
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| IDSS | saturated drain source current | Logical people think this should be abbreviated"SDSC" |
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| IEC | International Electrotechnical Commission | A standards organization. |
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| IEEE | Institute of Electrical and Electronics Engineers | The subgroup MTT-S hosts an annual gathering of all things microwaves, publishes a lot of excellent but often hard-to-read microwave-related papers, and is helping to review some of our MW101 articles. |
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| IF | intermediate frequency | The output frequency of a down converter. |
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| IIP2, IIP3 | input third order intercept point | The intercept points, referenced to input. |
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| IIP3 | input third order intercept point | Same as ITOI. |
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| IL | insertion loss | -- |
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| ILFD | injection locked frequency divider | -- |
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| IM | intermodulation | -- |
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| IMAX | maximum current for a FET | Maximum FET channel current, typically measured at +0.5 volts VGS and +1 volt VDS. |
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| IMD | intermodulation distortion | Often refers to "TOI". |
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| IMN | input matching network, inter-stage matching network | -- |
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| IMP | intermodulation products | -- |
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| IMPATT | impact avalanche and transit time | A nearly forgotten diode technology that offered great promise for supplying high power at millimeter wavelengths. |
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| IMR | intermodulation ratio | The difference in magnitude of observed during two-tone IMD measurements. |
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| INP | indium phosphide | A III-V compound semiconductor suitable for frequencies up to and beyond 100 GHz. |
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| IP | intellectual property | What you try to protect with a patent. |
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| IP2 | second order intercept point | -- |
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| IP3 | third order intercept point | -- |
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| IRM | image reject mixer | A mixer that removes the image frequency contribution from the IF. |
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| ISM | Industrial scientific medical | Frequency band designation |
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| ISV | individual source vias | The best possible grounding scheme for power FETs, usually required 2-mil substrates. |
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| 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. |
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| ITOI | input third order intercept | Same as IIP3. |
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