Specification of the module DB.

 

Project: ICARUS 600T

 

Author: B. Baiboussinov.

 

Decoupling board.

 

The decoupling board (DB) serves to distribute High Voltage, to divide high and low voltage part of the electronics of the detector, to distribute calibration signals to each channel. Normally the module is placed between feed-though of detector and analogue board.

For each 32 channels one DB module is used. Inside of Module each wire to high voltage supply through several resistor 10 MOhm is connected. The circuit of module is very simple and has calibration capacitors, decoupling capacitors and the circuit to test odd or even channels.

The DB has input high density connectors JP3 (68 pins connector with 34 twisted pair flat cables, with 0.635 mm pitch)(table 2), output connector 64 pins DIN type U1 (table 3) and the connector with power and calibration signals U3 (table 1) (fig.1).

The module is 4U height unit. The DB module consists from three boards: main, high voltage and connection boards. The dimensions of the boards are 70x144.5x1.6 , 95x71x1.6 and 68x20x1.0. The module DB from EMI by screening box is shielded .

 

 

 

 

Figture.1. Module DB.

 

 

 

Specification of the calibration circuit:

 

Gain Differential Amplifier 2,0

V input max.( differential) - 5 Volt

Input resistance of driver - 300 KW

Input capacitance of driver - 10 pF

Value of the calibration capacitors - 1pF

Temperature stability Ccalib. - 100 ppm/C

 

Digital signal: Level

 

Enable_odd - TTL

Enable_even - TTL

Comm_pulse - TTL

 

 

High Voltage:

 

Biasing resistor - 10 MW (+/- 20% )

Decoupling capacitor - 4,7 nF

V working max. - 500 V

V max. - 1000 V

 

Typical isolation between a ground and a high voltage is 1 KV.

 

 

Power dissipation :

type of a relay

 

+ 5 Volt - 40 mA TXS2SA- 4.5 V,

- 70 mA TX2SA - 5 V.

- 5 Volt - 15 mA.

 

 

The connector U3 has:

 

1. Low voltage +5 Volt and -5 Volt.

2. Analogue Ground.

  1. Enable of the calibration signal for even channels.

4. Enable of the calibration signal for odd channels.

5. Test pulse - differential analogue signal.

  1. High Voltage.

7. Common test signal to test connections of the wires from feed-though

to front-end electronics.

T-PULSE(+/-) - Calibration Test Pulse

 

ENABLE_ODD Enable of the test Pulse for odd channels.

0 - calibration of odd channel disable

1 - calibration of odd channel enable

 

ENABLE_EVEN Enable of the test Pulse for even channels.

 

0 - calibration of even channel disable

1 - calibration of even channel enable .

 

Comm-pulse

0 - Common Pulse of the test connection of wires disable

1 - Common Pulse of the test connection of wires enable

 

AGND - Analogue Ground of linear power supply

HVOLT(1/2) - High voltage

 

 

Table 1. Connector U3 pin list.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 2. Input connector JP3.

 

 

 

 

 

 

 

 

 

 

Table 3. Output connector U1.

 

 

 

 

  1. Analogue Crate of ICARUS detector. Baiboussinov B.

    2. Iccrate.doc 19.04.98

  2. The racks on the top of the 600 T detector. Baiboussinov B., Sergiampietri F.

    3. 21sep98.doc 22.09.98

  3. Decoupling board. Baiboussinov B. Dbdocumentation.doc