E614 Experiment Electronics

From: John Schaapman <jsch@relay.phys.ualberta.ca>
Date: Fri, 21 May 1999 15:12:19 -0600 (MDT)
To: e614electronics@relay.phys.ualberta.ca
Subject: Postamp Prototype Tests, Part4

Postamp/Discriminator First Stage Prototype Tests, Part 4
  Tests of the Non-inverting version



John Schaapman                     Ph: 780-492-3043
Centre for Subatomic Research     Fax: 780-492-3408
University of Alberta            NOTE: new area code
Edmonton, AB
CANADA       T6G 2N5

Postamp/Discriminator First Stage Prototype Tests, Part 4



NON-INVERTING Opamp – Channel 1 driven

      Linearity and                                                    Output Width – PM6654 counter

        Fig 40     2 db            300 mv/ 50 mv      Av = 6              35.80 nsec

        Fig 41    12 db           100 mv/ 16.8 mv   Av = 5.95         31.94

        Fig 42    22 db             60 mv/ 10 mv      Av = 6              26.18

        Fig 43    32 db             60 mv/ 10 mv      Av = 6              16.76

     Input Termination versus stored waveform

        Fig 44

     Output Pulse Width Jitter versus Amplitude

         Fig 45    32, 22,12,2 db

     Output Leading Edge Jitter versus Amplitude

         Fig 46     32,22,12,2 db

     Crosstalk

         Fig 47

     Crosstalk – Channel 2 input shorted

          Fig 48



     Crosstalk Measurements

         Threshold adjusted for no crosstalk or noise on Channel 2   +48.47 mv

             Lowest setting for output on channel 1  35 db  - signal range 33 db

          Shorted input to channel 2 readjust threshold for no crosstalk or noise 

                triggering    + 19.47 mv

               Lowest setting for output 40 db- signal range 38 db



          Crosstalk/noise of postamp is 5 db better than crosstalk of preamp.