1. 1 Characterization of the PCA16 CERN, 14 th July 2008 M. Mager, L. Musa

2. 2 PCA16 - modes of operation Shaper Mode 3 rd Order semi Gaussian Shaper (32 different configurations) PolarityPositive (MWPC-like signals)Negative (GEM-like signals) Conversion Gain (mv / fC) 12151927 Peaking Time (ns) 306090120 Preamp Mode Classical CSA w/o PZ cancellation (32 different configurations) PolarityPositive (MWPC-like signals)Negative (GEM-like signals) Conversion Gain (mv / fC) 5.255.55.86.5 Rise Time (ns)10306080 Decay Time (  s) Continuous in the range [1:10] Performance very close to the design specifications in all modes of operation

3. 3 Shaper Mode

4. 4 Shaper Mode – Some Results Positive Polarity (MWPC-like Input Signal)

5. 5 Shaper Mode – Some Results

6. 6 Positive Polarity (MWPC-like Input Signal)

7. 7 Shaper Mode – Some Results Positive Polarity (MWPC-like Input Signal)

8. 8 Shaper Mode – Some Results Negative Polarity (GEM-like Input Signal)

9. 9 Shaper Mode – Some Results Negative Polarity (GEM-like Input Signal)

10. 10 Shaper Mode – Some Results Negative Polarity (GEM-like Input Signal)

11. 11 Shaper Mode – Some Results Negative Polarity (GEM-like Input Signal)

12. 12 Preamp Mode – Some Results Negative Polarity (GEM-like Input Signal)

13. 13 Preamp Mode – Some Results Negative Polarity (GEM-like Input Signal)

14. 14 Preamp Mode – Some Results Negative Polarity (GEM-like Input Signal)

15. 15 Negative Polarity (GEM-like Input Signal)

16. 16 ALTRO Reference Voltages VIN VINB VREF TOP VREF BOT INCM TSA1001 OUT OUTB 0.56V 1.56V 0.56V DC ref. = 1.02V 10nF 1F1F 0V 10nF 1F1F ALICE PASA Configuration Reference Range (RR) = VREF TOP – VREF BOT Dynamic Range (DR) = [-RR ; + RR] Conversion Gain: CG = 1024 / (2 x RR) Digital Output Code = (V IN -V INB ) x CG + 512 Digital Output Code Range = 0:1023

17. 17 ALTRO Reference Voltages VIN VINB VREF TOP VREF BOT INCM TSA1001 OUT OUTB 0.56V 1.56V 0.56V DC ref. = 1.02V 10nF 1F1F 0V 10nF 1F1F ALICE PASA Configuration VIN VINB VREF TOP VREF BOT INCM TSA1001 OUT OUTB 250mV 1250mV 250mV DC ref. = 1.08V 10nF 1F1F 0V 10nF 1F1F Example of PCA16 Configuration (different for different settings)

18. 18 ALTRO Reference Voltages The DC levels of the PCA16 shaping amplifier vary with the CG SHAPER MODE Negative Polarity, Peaking Time (  ) = 120 ns, decay bias = 750 mV, SCLK = 33MHz CG (mv/fC)12151927 V TOP (mV)1050109211401200 Baseline (ADC) 42 PREAMP MODE Negative Polarity, Rise Time = 120 ns, decay bias = 750 mV, SCLK = 33MHz CG (mv/fC)5.255.55.86.5 V TOP (mV)10001078 Baseline (ADC) 33829721246

19. 19 ALICE TPC values: 220 , 1100   V TOP = 1020mV Proposed new values:150 , 1100   V TOP = 1078mV ALTRO Reference Voltages R2 R1

20. 20 ALTRO Reference Voltages The DC levels of the PCA16 shaping amplifier vary with the CG SHAPER MODE Negative Polarity, Peaking Time (  ) = 120 ns, decay bias = 750 mV, SCLK = 33MHz CG (mv/fC)12151927 V TOP (mV)1078 Baseline (ADC) 493315- PREAMP MODE Negative Polarity, Rise Time = 120 ns, decay bias = 750 mV, SCLK = 33MHz CG (mv/fC)5.255.55.86.5 V TOP (mV)1078 Baseline (ADC) 34829721246