Electric lamp and discharge devices: systems – Cathode ray tube circuits – With secondary emission stage in the cathode-ray tube
Patent
1993-06-01
1994-11-22
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
With secondary emission stage in the cathode-ray tube
313533, H01J 2941
Patent
active
053672224
ABSTRACT:
A gain control circuit (10) for remotely controlling the gain of a photomultiplier tube (PMT (12)). The remote gain control circuit (10) may be used with a PMT (12) having any selected number of dynodes (DY). The remote gain control circuit (10) is connected to the last dynode nearest the anode (16) in the dynode string which controls the total dynode supply voltage and influences the gain of each dynode (DY). The remote gain control circuit (10) of the present invention includes an integrated-circuit operational amplifier (U1), a high-voltage transistor (Q1), a plurality of resistors (R), a plurality of capacitors (C), and a plurality of diodes (D). Negative feedback is used to set the last dynode voltage proportional to a voltage controlled by the gain control voltage delivered by a voltage source such as a digital-to-analog converter. The control circuit (10) of the present invention is connected to the last dynode using a single connecting wire (22).
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Blum Theodore M.
CTI Pet Systems, Inc.
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