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| double range pulse amplifier |
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| sdouble:
Hi all, I do need to amplify and filter photomultiplier pulses. Frequencies involved in the pulse are in the [1;170] Mhz range. Repetition rate is moderate (say, 10 kHz). From 1 photomultiplier output I would like to generate 2 voltage signals. 1)copy of the input, only low-pass-filtered. Opamp based 2nd order Sallen-key topology, Bessel filter foreseen. 2)amplified output : X10 gain. Same frequency range. This is not straight forward I think due to the high gain bandwidth requirement. Last but not the least : the amplified output could get saturated. I planed to use -5 V and 5 V rails. Input signal could be of 1 volts. In case of saturation of the amplified output, I need to avoid the saturation of the other (non amplifed) output. Do you have any schematics in mind which could fulfill my needs ? best |
| David Hess:
The requirements are not impractical but I suspect there will be a problem with the x10 amplifier recovering from saturation unless this is taken into account in the design. If it is a problem, then the input signal level is high enough that a current biased diode bridge at the input of the amplifier can operate as a very fast and accurate clamp to prevent this. |
| Neomys Sapiens:
For actual suggestions, even if not detailed, you left out some (rather many) parameters. Like impedance present at the outputs, need to be short-circuit proof or not, and also some information related to the time-domain behaviour, such as total delay of the circuit and if a delay difference between the outputs is allowed. |
| sdouble:
thanks for your help here are some clues --- Quote from: Neomys Sapiens on April 03, 2019, 09:20:59 pm ---For actual suggestions, even if not detailed, you left out some (rather many) parameters. Like impedance present at the outputs, --- End quote --- The photomultiplier is 50 ohms adapted. --- Quote from: Neomys Sapiens on April 03, 2019, 09:20:59 pm ---need to be short-circuit proof or not, --- End quote --- that is not needed. --- Quote from: Neomys Sapiens on April 03, 2019, 09:20:59 pm ---and also some information related to the time-domain behaviour, such as total delay of the circuit and if a delay difference between the outputs is allowed. --- End quote --- This is not crucial too. timing is anyway calibrated based on actual data. Total delay will be of a few ns I guess which is clearly not an issue. |
| sdouble:
here is what I had in mind http://] |
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