Charge integration preamplifier for use in radiation detection c

Details Charge integration preamplifier for use in radiation detection c Charge integration preamplifier for use in radiation detection c

1993-03-22

1994-06-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

328127, 330308, H01J 4014

Patent

active

053229959

ABSTRACT:
A charge integration-type preamplifier for use with a radiation detector. The preamplifier is capable of electronically resetting a feedback capacitor, prevents intrusion of noise, and offers high resolution and high counting rate. An inverting amplifier is connected with the radiation detector and has an N-channel FET at its first stage. The output signal from this amplifier is fed back to the gate of the FET via an electrostatic capacitor. The preamplifier further includes a reset means which urges the voltage at the output of the inverting amplifier to rise via the capacitor by utilizing the feedback action. The junction between the gate and the source of the FET is forward-biased to release the charge stored in the capacitor to the source, thus resetting the capacitor. This maintains continuous operation. Thus, any interference causing noise between the radiation detector and the gate of the FET is not created. Furthermore, the disturbance caused by the resetting can be removed in a short time.

REFERENCES:
patent: 4750217 (1988-06-01), Smith et al.
patent: 4808810 (1989-02-01), Van Doorn
"Charge Amplification Without Charge Leak Resistor", V. Radeka, IEEE Trans., Nucl. Sci., NS-17, No. 3, pp. 433-439 (1970).
"An Improved Operating Mode For a Si(Li) X-Ray Spectrometer", N. W. Madden, F. S. Goulding et al., IEEE Trans. Nucl. Sci., NS-37, No. 2, pp. 171-176, (1990).

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