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  2. PIN diode - Wikipedia

    en.wikipedia.org/wiki/PIN_diode

    At high frequencies, the PIN diode appears as a resistor whose resistance is an inverse function of its forward current. Consequently, PIN diode can be used in some variable attenuator designs as amplitude modulators or output leveling circuits. PIN diodes might be used, for example, as the bridge and shunt resistors in a bridged-T attenuator.

  3. Position sensitive device - Wikipedia

    en.wikipedia.org/wiki/Position_sensitive_device

    A 2-D tetra-lateral PSD is capable of providing continuous position measurement of the incident light spot in 2-D. It consists of a single square PIN diode with a resistive layer. When there is an incident light on the active area of the sensor, photocurrents are generated and collected from four electrodes placed along each side of the square ...

  4. Signal tracer - Wikipedia

    en.wikipedia.org/wiki/Signal_tracer

    The diode detector is only sensitive to amplitude modulation but even circuits that are normally used for other modulation schemes (such as FM radios) can be tested by using an AM test signal for testing the radio frequency circuits, then switching to an FM test signal (and switching out the diode detector) for testing the audio circuits of the ...

  5. Crystal radio - Wikipedia

    en.wikipedia.org/wiki/Crystal_radio

    In modern sets, a semiconductor diode is used for the detector, which is much more reliable than a crystal detector and requires no adjustments. [48] [81] [98] Germanium diodes (or sometimes Schottky diodes) are used instead of silicon diodes, because their lower forward voltage drop (roughly 0.3 V compared to 0.6 V [99]) makes them more sensitive.

  6. Sensitivity (electronics) - Wikipedia

    en.wikipedia.org/wiki/Sensitivity_(electronics)

    The sensitivity of an electronic device, such as a communications system receiver, or detection device, such as a PIN diode, is the minimum magnitude of input signal required to produce a specified output signal having a specified signal-to-noise ratio, or other specified criteria. In general, it is the signal level required for a particular ...

  7. Envelope detector - Wikipedia

    en.wikipedia.org/wiki/Envelope_detector

    The envelope detector has several drawbacks: The input to the detector must be band-pass filtered around the desired signal, or else the detector will simultaneously demodulate several signals. The filtering can be done with a tunable filter or, more practically, a superheterodyne receiver; It is more susceptible to noise than a product detector

  8. Diode - Wikipedia

    en.wikipedia.org/wiki/Diode

    A PIN diode has a central un-doped, or intrinsic, layer, forming a p-type/intrinsic/n-type structure. [43] They are used as radio frequency switches and attenuators. They are also used as large-volume, ionizing-radiation detectors and as photodetectors. PIN diodes are also used in power electronics, as

  9. Semiconductor detector - Wikipedia

    en.wikipedia.org/wiki/Semiconductor_detector

    A semiconductor detector in ionizing radiation detection physics is a device that uses a semiconductor (usually silicon or germanium) to measure the effect of incident charged particles or photons. Semiconductor detectors find broad application for radiation protection, gamma and X-ray spectrometry, and as particle detectors.

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