10-Pole Filter/Shaper Test Card


Designed a Test Card with one Preamp/Shaper/Driver channel, to be used in the 14-Bit, 125 MHz ADC Board.
The schematic of the card is persented here: Preamp/Shaper/Driver Schematic.
The layout of the card is persented here: Preamp/Shaper/Driver Layout.

The Filter/Shaper configuration can be changed by replacing L1, C2, L3, C4, L5, C6, L7, C8, L9, C10.
This picture below presents two different filter configurations (7-Pole and 10-Pole) that were simulated, implemented on the Test Card, and tested:

10-pole and 7-pole schematic


The pictures below persent simulation results for the two filter configurations.
Simulation was performed with AccuSim by Mentor Graphics; the same input pulse was used.
7-Pole Filter/Shaper:

7-pole simulation result

10-Pole Filter/Shaper:
10-Pole filter simulation



10-Pole Scintillator/PMT Test

Performed a 10-Pole Shaper test using pulses from a Scintillator/PMT module.
The Module consists of a crystal block (containing double-layered 8x8 LSO/LYSO crystals) coupled to an array of 2 by 2 photomultipler tubes (PMTs). Each PMT is centered at a corner of the crystal block, and each double-layer detection element is 2.1 × 2.1 × 20 mm^3 (the individual scintillator length is 10 mm) and the crystal pitch is 2.43 mm.

This picture presents the Shaper Test Card Input signal, coming from the Scintillator/PMT Module (in yellow), and Output signal (in blue).
The scope sampled data are here: input, output.

pet1 scope plot


7-Pole Test

This picture presents a test on the same board, in the 7-Pole configuration and with the gain decreased by changing to: R3=R22=100Ohm.
- the input signal (in yellow), generated with a LeCroy 9210 generator;
- the differential output signal (Out1 and Out2 in green and red);
- the ADC Driver A)-52 outputs: OUTp (in bule), U3-5 OUTn (in green).
Channels 3 and 4, in this picture, show the required input swing for the ADC chip, in order to achieve full dinamic range.
The scope calculated difference is shown in red.
The scope sampled data are here: input, output1, output2, math.

scope plot 1
 

 
 
 


 
For questions regarding this page contact Mircea Bogdan.
bogdan@edg.uchicago.edu
Revised: July 18, 2007