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basic question from a newbie in analog electonics

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sdouble

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Hi everybody,
I'm Julien, I'm a nuclear physicist who has to amplify rare pulses (say 1kHz typical repetition rate). The pulse amplitude (50 ohms adapted) vary from 10 to 200 mV and I need to put 20 dB amplification on those pulses. The pulses are negative and exhibit a 1.5 ns rise time and 3 ns decay time, no plateau. The frequencies involved are, I assume ranging from 100 to 500 MHz.
I'm looking for an integrated amplifier which could do the job. Not so easy. to find the proper MMIC EphEMT. My main concern is the noise immunity.
Most have the wrong phase shift or too low P1dB. I was looking for something in the 2-3dB noise figure range. If I could afford the 10 dB noise, I would go for a High GBW op amp (OPA846 for instance).
Would you have any proposal ?
thanks in advance.
 

Miguel Gaspar

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For your application the worst case will be 200mV with a gain of 20dB Vo = 2V. The maximum velocity is at 1.5nS that result in a SR = 1333v/uS. And BW 500MHz

From National : High-Speed Amplifiers | National Semiconductor the first 14.

From Texas: http://focus.ti.com/paramsearch/doc...TEQ&frb=1a&fev=1700&rangeValuesSelected=1700&
familyId=72&uiTemplateId=NODE_STRY_PGE_T&techFamId=null&rootFamilyId=null&sectionId=null&tabId=null&appId=null&viewDeviceCallingPage=null&showAdditionalParameters=no&rpc=D_PARAMETER_2000512|GTEQ|500|0&lc=2000480&lc=2100358&lc=2300022&lc=2000512&lc=2200001&lc=2300233&lc=2001185&lc=2001184&lc=2300967&lc=2300601&lc=2000494&lc=2000078&lc=2201182&compare=yes&download=yes&sort=yes&customize=yes&paramResults=yes&paramCriteria=yes&familyTree=yes&military=no&baSystem=yes&paramTable=no&sortOption=PA_PART_NUMBER&sortMode=ASC&searchPaths=1000072&pageId=undefined&templateId=0&navigationId=0&family=analog&paramTable=no&military=no&&uiTemplateId=NODE_STRY_PGE_T&techFamId=null&rootFamilyId=null&sectionId=null&tabId=null&appId=null&viewDeviceCallingPage=null&resetCompare=true#sdp


From Analog devices: AD8099, ADA4899-1, ADA4857-2, ADA4857-1

Those will acomplish your requirements

greetings
 

sdouble

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THanks for your advice.
I'm afraid that most of those OPAMP don't exhibit the right bandwidth at gain 10 (20 dB). A few of them do, that's true. However, the noise figure is pretty high. That's why I was looking on the MMIC side. Maybe hopeless on that side ?
Cheers,
Julien
 

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