In the commercial available charge sensitive preamplifier for semiconductor radiation detector.Generally the HV(High Voltage) bias given to the semiconductor detector is through the charge sensitive preamplifier. Why it is done like this?
Why HV bias is not given separately to the semiconductor detector?
I will be very much thankful for the reply.
Dear Manoj,
If I understand your question correctly, you are referring to the SHV input into a commercial preamplifier commonly designated "bias" with BNC output commonly designated "energy".
If you look carefully at the preamplifier schematic, the DC bias is supplied to the detector through one or more load resistors. The detector input signal is usually capacitively coupled to the preamplier, where the coupling capacitor is located between the DC bias input and the preamplifier. Hence, the bias voltage is actually not being applied through the preamplifier circuit. The coupling capacitor serves as a filter to block DC current while passing AC signals from the detector to the preamplifier.
You can fashion a preamplifier of your own and apply the bias separately, but a commercial preamplifier offers a convenient method of both biasing the detector while coupling the detector to the preamplifier.
Sincerely,
Douglas
Dear Manoj,
If I understand your question correctly, you are referring to the SHV input into a commercial preamplifier commonly designated "bias" with BNC output commonly designated "energy".
If you look carefully at the preamplifier schematic, the DC bias is supplied to the detector through one or more load resistors. The detector input signal is usually capacitively coupled to the preamplier, where the coupling capacitor is located between the DC bias input and the preamplifier. Hence, the bias voltage is actually not being applied through the preamplifier circuit. The coupling capacitor serves as a filter to block DC current while passing AC signals from the detector to the preamplifier.
You can fashion a preamplifier of your own and apply the bias separately, but a commercial preamplifier offers a convenient method of both biasing the detector while coupling the detector to the preamplifier.
Sincerely,
Douglas
Dear Manoj,
Dr Douglas gave the proper description on how the HV Bias is fed to the detector via the preamp box.
Now depends on your application. My question is why do you need to have it separate?
Yours,
Djelloul.
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