Beam current measurement

Details Beam current measurement Beam current measurement

1997-02-03

2000-05-16

Lee, Michael H.

Television

Cathode-ray tube display beam current control

348805, 327108, 330265, H04N 568

Patent

active

060644346

ABSTRACT:
In a beam current measurement device, including an output transistor (T1) for supplying a cathode current (Ic), a measurement output (OUTM) for supplying a measured current (Im) representing the cathode current (Ic), a first current source (Ibias1) coupled to a first main terminal of the output transistor (T1) for supplying a first current (Ibias1), and a second current source (Ibias2) coupled to a second main terminal of the output transistor (T1) for supplying a second current (Ibias2) substantially equal to the first current (Ibias1), a first cascode transistor (Ta) is coupled between the first main terminal of the output transistor (T1) and the measurement output (OUTM).

REFERENCES:
patent: 4224640 (1980-09-01), Hovens et al.
patent: 4679092 (1987-07-01), Blanken et al.
patent: 4680640 (1987-07-01), Blanken et al.
patent: 4703345 (1987-10-01), Matsuzaki et al.
patent: 5406139 (1995-04-01), Sharpe-Geisier

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