CARDIAC meeting – 30 Sept 05 [email protected] M3R3-M5R3-M5R4 FEE status.

CARDIAC meeting – 30 Sept 05CARDIAC meeting – 30 Sept 05 [email protected]@lnf.infn.it

M3R3-M5R3-M5R4

FEE status

22CARDIAC meeting – 30 Sept 05CARDIAC meeting – 30 Sept 05 [email protected]@lnf.infn.it

OverviewOverview

FEE – from ASDQ to CARDIAC• ASDQ++• CARDIAC

• I2C induced signals

HV induced noise• HV noise coupling

LV distribution• Regulator Vout spread & LV distribution bars Vdrop

CARDIAC threshold scan• M3R3 – M5R3 – M5R4

Grounding• Detector grounding scheme

Conclusions


ASDQ++ASDQ++A brief history (I)A brief history (I)

• Nightmare first two chambers prototypes test fee instability cable layout/orientation sensitivity

• ASDQ++ PCB rel. 2 small improvement on the instability side still problems with cabling

• Buffer board & FC connections fully stable fee behavior no dependency on cable layout

- Some capacitors for supply voltage decoupling- inner layers for GND/V+/V-


ASDQ++ASDQ++A brief history (II)A brief history (II)

Programmable current sink

ASDQ output stage

standard current set : 3 mA (300 mV/100 ) current set for driver board : 1 mA (300 mV/300 )

R=300

SPBASDQ++Ground connectionFaraday cage

HV

1 M

680 nF

Faraday Faraday CageCage

sensitive path

Cathode pads readout

LVDS


ASDQ++ASDQ++A brief history (III)A brief history (III)

• Pads X-talk charge injection in pads belonging to the same pad wire charge injection in contiguous pad wires

HV

Signal on this wire pad

Signal injection

Signal injection

charge injection in pads belonging to the same pad wire poor ground connection (capacitor-GND)

charge injection in contiguous pad wires nose ground not enough a resistor in the grounding path mitigates the problem and help with HV & pickup noise

ZGND < ZWire Pads

HV nose


The IB System architectureThe IB System architectureThe IB and the TB boardsThe IB and the TB boards

HV

Signal on this wire pad

Signal injection

Signal injection

ZGND << ZWire Pads

HV nose

22

In the last T11 TB 4 CARIOCA (NOT CARDIAC !!!) boards were installed in one of our M3R3 chamber. We took some data @ Vth 6/7 fC


CARDIACCARDIACI2C induced signals (I)I2C induced signals (I)

I2C

AB

CD

EF

Termination


CARDIACCARDIACI2C induced signals (II)I2C induced signals (II)

Read ScalerRead all registers

M3R3 CARDIAC : A – B – C – D [all channels]

M3R3 CARDIAC : F [1° (?) channel – other channels ok]

Read all registers Read Scaler

NB : 5 pulses are generated by the readout procedure (?!) ask to Valerio

CASINO

?

I2C

CARDIACout

I2C

CARDIACout

I2C

CARDIACout


CARDIACCARDIACI2C induced signals (III)I2C induced signals (III)

I2C

AB

CD

EF

Termination

All boards/all channels OKProblems in the PCB due to high frequency signal components

CARDIAC F – 1° channel


CARDIACCARDIACI2C induced signals (IV)I2C induced signals (IV)

Termination

I2C

AB

C

DE

F

No ch1 problem with M5R3 chamber ??!!M3R3 – M5R3 difference : Cpad value

M5R3

Cpad

I2C line

Z1 Z2

I1 I2

CARIOCACparasitic

What are we going to have with smaller Cpad

and shorter interconnection cables ?


HV induced noiseHV induced noiseNoise couplingNoise coupling

Continuous cathode

Wire

Cathodes

HV distribution line = antenna

Inoise

filter HV before distribution line

6 cm

V < 5 VC = 2.2 nF


LV distributionLV distributionRegulator output voltage spreadRegulator output voltage spread

Iload=1.5A

60 mm

LV distribution bars - PCB dimension for region R4

800 mm

R=0.45 m/□ R = (800/30)*0.45 m Voltage drop ~ 20mV (< 1% Vcc)

GNDVCC


CARDIAC threshold scanCARDIAC threshold scanM3R3 – M5R3 – M5R4M3R3 – M5R3 – M5R4

M3R3• 100 Hz @ 4.4 fC (working threshold = 5 fC)



HV ON


GroundingGroundingDetector grounding schemeDetector grounding scheme

No current through the reference GND Reference GND = Safety GND

3 A fuses on the LV distribution system1 mA max current on the HV lines

Low step up current in case of failure

No current through the reference GND Reference GND = Safety GND

3 A fuses on the LV distribution system1 mA max current on the HV lines

Low step up current in case of failure

system reference ground safety ground


System qualificationSystem qualificationSkew measurements Skew measurements M4(M5)R3 M4(M5)R3

To verify front-end behavior threshold scan should be executed WITHOUT HV ON (HV is a source of external noise and can be filtered out), anyway FEE work fine with the 3 instrumented chambers

No instability due to cable layout or external source has been detected

HV filters are OK with the HV PS we have used in our test, but that PS is not the final one !

LV boards and LV distribution are OK (~10 mV drop for M3R3 regions and ~20 mV for M4R4 regions)

The detector grounding scheme has already been (successfully) reviewed

The 3 instrumented chambers work fine (NB : M5R3 is not instrumented with the final FC)

I2C access can trigger CARDIAC output spurious pulses ONLY during CARDIAC access

According to our tests CARDIAC work fine when used to instrument M3R3, M5R3 and M5R4 chambers

CARDIAC meeting – 30 Sept 05 [email protected] M3R3-M5R3-M5R4 FEE status.

Documents

Transcript of CARDIAC meeting – 30 Sept 05 [email protected] M3R3-M5R3-M5R4 FEE status.