Pre-Irradiation Characterization

A set of reference data was taken in B186 before the irradiation started. Ipre = 220, Ishpr = 20, Edge Off, Compression Mode 1.

• Trimming (both links). 1 fC input, target 50% point of 82.5 mV on TrimRange 0 (Run 1666 scans 3-66). Removing a large amount of noisy channels and some non-trimmable channels there are 1290 good channels. These noisy channels appeared during module construction and they were already observed in Valencia.
• Response Curve. Qin = {0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0, 5.5, 6.0} (Run 1668 scans 1-13)
• Time Walk.(link0 & link1). Edge on. (Run 1668 scans 14-25)
• Noise & Gain versus FE currents. Response curve for Qin = {1.0, 1.5, 2.0, 2.5} fC, linear fit at each current setting. Noise extracted at 1.5 fC. (Run1670 scans 1-32)
• Link0: Gain plot, Noise plot, & summary file.
• Link1: Gain plot, Noise plot, & summary file.

The analogue parameters are monitored during the irradiation, by means of threshold scans for input charges Q_in = {1.0, 1.5, 2.0, 2.5} fC. This is done for Preamplifier currents I_pre = {100, 150, 200, 250} uA and shaper currents I_shpr = {20, 30} uA. These scans are fitted with a linear response curve to extract the parameters.

• Gain link0 link1.
• Noise link0 link1
• Mean Spread  link0 link1

Post-Irradiation Characterization

Optimisation of preamplifier currents:

• Response curve for Qin = {1.0, 1.5, 2.0, 2.5} fC linear fit at preamplifier currents I_pre = {100, 150, 200, 250} uA and shaper currents I_shpr = {20, 30} uA. (Run1534 scans1-34)
 
• Link0: plots & summary file.
• Link1: plots & summary file.

• Response curve for Qin = {2.0, 3.0} fC linear fit at preamplifier currents I_pre = {128.8, 147.2, 165.6} uA and shaper currents I_shpr = {18, 24, 30} uA. (Run1544 scans1-18)
 
• Link0: plots & summary file.
• Link1: plots & summary file.

• Optimal current setting found to be I_pre = 128.8, I_shpr = 24.
• Trimming (link0 & link1). 1 fC input, target 50% point of 80 mV on TrimRange 3 gives 1136 trimmable channels. (Run 1555 scans 1-16). There is clearly a problem with setting the TrimDAC Range. The slopes of the TrimDAC plots indicates that the actual TrimRange is not always 3 and varies from chip to chip. Hence the large number of untrimmable channels. Not yet understood. Trim and Mask files.

Operating range before irradiation:

• Vdd >= 3.3 V OK
• Vdd = 3.2 Protocol Violations.

• 34% - 55% (Hex 1-F) OK
• 57% (Hex 0) Inefficiencies on readout.

@ Vdd = 4.0V    OK if S3, S5, S9, S11, S12, S12 & E13 bypassed
@ Vdd = 4.3V    OK if S3, S9, S11, S12, E13 bypassed
@ Vdd = 4.0V    OK if S3 & S11 bypassed
@ Vdd = 4.8V    All chips OK

Chip origin: Batch 34685, Wafer ID5
 

Chip	M0	S1	S2	S3	S4	E5	M8	S9	S10	S11	S12	E13
X	9	10	11	7	5	8	10	14	4	7	11	13
Y	1	2	2	3	4	4	4	4	5	5	3	5

Power consumption

Before irradiation: (Vdd = 4.0V, Vcc = 3.5V, Vth = 500mV, Ipre = 220, Ishpr = 20)

• Idd = 444 mA    (LVDS drivers on the support card not subtracted, about 40 mA)
• Icc = 795 mA

• Idd versus threshold voltage (Vdd = 4.0V)
• Idd versus Vdd (Vth = 500mV)

* All tests before irradiation made at Vbias = 135 V. Resistance on the PT1000 = 1040 Ohms (temperature to be calibrated).