Beam current measurement

Beam current measurement

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 tran...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: VAN DER ZEE, PIETER
Format: Patent
Sprache:eng
Schlagworte:
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung: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).