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PADI status. PADI. FEE1. Mircea Ciobanu 11 th CBM Collaboration Meeting February 26-29, 2007, GSI. Outline. Status of the PADI: - electrical measured parameters - results in the beam test for rate evaluation - preparations for beam test of  t What to do next Summary and Outlook.

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padi status

PADI status



Mircea Ciobanu

11th CBM Collaboration Meeting

February 26-29, 2007, GSI

  • Status of the PADI:

- electrical measured parameters

- results in the beam test for rate evaluation

- preparations for beam test of t

  • What to do next
  • Summary and Outlook

Design phase of PADI

  • Comparison NINO_FEE - FEE3
  • Simulations for new Preamplifier Discriminator PADI

Measurement phase of PADI

  • Electrical measurements
  • Measurements together TACQUILA3
  • Connection with a Diamond Detector to test in

beam the rate capability and the stability of the system in real conditions.

the padi together with a sc diamond 4 pixels detector

Time Output's

LAN-K5 cable




SC Diamond

Pixel Detector

Interface PCB




Converter PCB


The PADI together with aSC Diamond (4 pixels) detector
rate histogram for 110 spills the beam has a fixed position
Rate Histogram for 110 spills(the beam has a fixed position)

Integral number

of counts :

pixel #1 6.22030 x106

pixel #26.24211 x106

pixel #4 6.22465 x106

average: 6.22902 x106

individual error ~ +/- 0.2%

September 25 - 28, 2007 Dresden

Summary of tests

The PADI design was successful tested, all channels are operational.

The connection of PADI with our TAQUILA3 Data Acquisition system

works properly.

The first results indicate:

Time res.(@10mV) [ps] < 10

Gain ~ 60

Bandwidth [MHz] ~ 180

Linear range [mV] ~ -5 to 5

CTRR [dB] ~ 26 - 40

CMRR [dB] > 40

Input impedance [] ~ 48 - 58

Power [mW/Ch] ~ 31

The PADI design was successful tested, together with a 4 pixels SC diamond detector. The system was stable in under beam conditions.

The AC transmission measurements shows a possible instability of the PADI preamplifier cell.

The connection of PADI with the detector is critical: the line used should have a flat frequency characteristic of the impedance to avoid particularly resonances.

If the input signal is near the threshold limit, the discriminated output signal has a very low width (~1ns). We have tried to transport such signals through a 110  twisted pair LAN-K5 cable and the channel rate limit was 1.5 x 108 hits/s.


Technological details for the direct bonding of the PADI ASIC on the pcb. In the FOPI new START system we will test two variants: in air bond-wires with mechanical protection and Glob Top (epoxi compound) protection.

the next step redesign of padi
The next step: Redesign of PADI

Design goals

We started from the NINO1-CERN ASIC schematics used for the ALICE ToF. For a simple comparison between time over threshold and Q measurement for WALK correction, we have added an supplementary buffer block to obtain both information's: time and energy. The whole design was matched for CMOS 0.18 m technology.

Very high time resolution

Cope with pads and strips RPC's

Higher Integration

Lower Power consumption

Lower price per channel


Redesign goals

1. Four channels instead of three.

2. The increase of closed loop stability.

3. The increase of bandwidth of the preamplifier cell.

The redesign work can be finished at the end of May and the layout at the end of July.

preamplifier ac equivalent diagram
Preamplifier: AC equivalent diagram

September 20-22, 2006 Strasbourg

t ~√Nd /(As*√BW)

  • To make tests together with the standard RPC detector.
  • We are ready to connect the PADI test plate with the new generation of TAC.
  • It is the necessary to evaluate QDC versus ToT methods for charge evaluation before the redesign of PADI!
  • To redesign PADI for a 4 channel variant, and to take into account the following:

- Special simulations of the system stability to be above the suspicious of instability.

- The increase of PADI preamplifier - discriminator actual bandwidth is a hard task, but we will try to evaluate the limit of the used architecture. We will focus on the reduction of the parasitic capacitances present at the preamplifier input and output ports which in this moment dominates.

We acknowledge the support of the European Community-

Research Infrastructure Activity under the FP6

"Structuring the European Research Area" programme (HadronPhysics, contract number RII3-CT-2004-506078).