Glossary of EE Terms
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Maximum Acoustic Input
Maximum acoustic input is the maximum sound pressure level the microphone can accept, or the clipping level of the microphone, dB SPL.
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Medium earth orbit (MEO)
Generally defined as an orbit above low Earth orbit (altitude of 2,000 kilometers (1,243 miles) and below geostationary orbit (altitude of 35,786 kilometers (22,236 miles)).
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Membrane
A membrane is the moving part of the condenser.
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MEMS
Microelectromechanical systems (MEMS) integrate mechanical elements and electronics all patterned on a silicon substrate with standard microfabrication techniques. Feature dimensions are on the order of 1 μm.
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Microfabrication
Microfabrication is the technology used to fabricate components on a micrometer-sized (or smaller) scale.
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Micrometer
A micrometer or micron (symbol μm) is one millionth of a meter or equivalently one thousandth of a millimeter.
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Mixer
Circuit block used to translate signals from one frequency to another.
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Most Significant Bit (MSB)
The most significant bit (MSB) is the bit position in a binary number having the greatest value, positioned in left-most position. The MSB can also correspond to the sign of a signed binary number in one or two's complement notation. "1" indicating negative and "0" indicating positive.
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Multipath Propagation
A transmission path anomaly that acts as a time-varying source of signal non-linearity. Multipath can distort or reduce a received signal to the point of unreliable reception. In television, multipath is manifested as image "ghosting".
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Multiplyinh DAC (MDAC)
Multiplying DACs provide a function whereby the reference voltage level can be varied over a specified voltage range and frequency. The transfer function is Vout = Vref x the digital word. Multiplying DACs can be used as digital attenuators, waveform generators, and for calibration control. 2-quadrant multiplication the means either the Vref or Vout will support a bipolar range; 4-quadrant multiplication means that both the Vref and Vout will support a bipolar range.
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Multitone Power Ratio (MTPR)
The spurious free dynamic range containing multiple carrier tones of equal amplitude. It is measured as the difference between the rms amplitude of a carrier tone to the peak spurious signal in the region of a removed tone.
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