Distributed deflection plates: Difference between revisions

Distributed deflection plates (view source)

1 byte added , 12 December 2023

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 For example, if it takes 1 ns for an electron to travel the length of the plates (usually one on each side of the electron beam) and a 1 GHz sine wave is applied between the plates, the full 360 degrees of the sine wave causes the electron to move up and down during transit.  By the time the electron exits the plate area 1 ns later, the electron is back where it started from.  There is no net deflection and the sensitivity is zero at this frequency.
-Making the transit time shorter by shortening the deflection plate increases the bandwidth, but reduces the deflection sensitivity by the same factor.  Using a distributed deflection plate structure is a way around this, extending the bandwidth without reducing the deflection sensitivity.  The only trade off is in complexity and therefore cost.
+Making the transit time shorter by shortening the deflection plates increases the bandwidth, but reduces the deflection sensitivity by the same factor.  Using a distributed deflection plate structure is a way around this, extending the bandwidth without reducing the deflection sensitivity.  The only trade off is in complexity and therefore cost.
 In the distributed deflection plate structure, the original deflection plates are cut up into individual segments.  The capacitance of the deflection plates can then be made part of a lumped delay line by adding inductance between each of the plate segments.  These inductors are actually inside the CRT.