Re: Pulse height amplitude (fwd from Fernando)

[Elton Smith <elton@jlab.org>]

-------- Forwarded message ----------
Date: Sat, 05 Apr 2008 18:21:25 -0400
From: Fernando J. Barbosa <barbosa@jlab.org>
To: George Lolos <George.Lolos@uregina.ca>
Cc: Elke-Caroline Aschenauer <elke@jlab.org>, "elton@jlab.org" <elton@jlab.org>,
     Carl Zorn <carl.zorn@jlab.org>, Kathryn Janzen <janzen2k@uregina.ca>
Subject: Re: Pulse height amplitude

Hi George,

Thanks for the information. The pulse amplitudes seem reasonable. It may be 
possible to increase the range if these amplifiers are being fed from +/- 5V 
supplies - something to discuss with SensL after all the tests are performed.

The fADC has been designed for -0.5, -1 and -2 V amplitude ranges. Eventually, 
we will also need to consider the issue of the splitters (passive of active 
buffer) and their impact on amplitudes and S/N.

Regards,
Fernando


George Lolos wrote:
> Hi Fernando:
> 
> I talked to Kethryn and we looked at the oscilloscope traces of the signals 
> from the SiPMPlus illuminated with BCF-20 light being excited with the 375 nm 
> laser.   We know that at ~1.2 V we see the saturation of the amplifier.  On 
> the other hand, pulses up to ~ 800 mV are perfectly shaped.  Once Kathryn 
> finishes this round of scanning individual cells within the 16-cell array, 
> we'll map the range of amplitudes to determine more accurately the onset of 
> saturation.
> 
> Cheers,
> 
> George
>