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Plate detector (radio)
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<p>In electronics, a plate detector (anode bend detector, grid bias detector) is a <a href="/facts/Vacuum_tube/VHd1BNLq">vacuum tube</a> circuit in which an amplifying tube having a control grid is operated in a non-linear region of its grid voltage versus plate current transfer characteristic, usually near plate current cutoff, to <a href="/facts/Demodulation/GFLGoxFl">demodulate</a> amplitude modulated carrier signal. This differs from the <a href="/facts/Grid-leak_detector/JQa90pxs">grid leak detector</a>, which utilizes the non-linearity of the grid voltage versus grid current characteristic for demodulation. It also differs from the diode detector, which is a two-terminal device. </p>