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threshold, noise, gain, discriminator offset, time resolution and slewing time for the remaining 24 chips. The identification numbers of the corresponding AD16 boards are: 15 - 28, 30, 31, 36, 38 and 39 - 44. Since the board has only one chip installed on it, we refer to the board numbers as the chip numbers. |
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Attenuators of 6, 10 and 20 dB were used to adjust the interval of the input signal amplitudes. The threshold was controlled by JTAG, measured in mV. A usual, the threshold goes down as the JTAG value increases (Qthr=0 at JTAG=1600 mV and Qthr=17.5 fC at JTAG=1500 mV). For all data the detector capacitance Cdet was set to 180 pF. |
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channel residuals (pages 8,19 in Fig. 1), are given in the Table below. Chips 16, 20, 23, 31, 38 and 40 (total of 6 out of 24, see page 21 in Fig. 1) have too big a difference between the maximum and minimum values of the parameter within the chip (each chip has 16 channels). See also page 22 in Fig. 1. There, the minimum, maximum and mean values are plotted for each chip. |
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time distribution for that channel. Page 1 in Fig. 2 presents the RMS at Qin=100 fC and the variation of the RMS, which was defined as Max(RMS) - Min(RMS) in the interval of 50 fC < Qin < 500 fC. |
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Parameter | Mean | Sigma | Page # in Fig. 1 |
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Threshold, fC | 17.5 | 4.2 | 1 |
Threshold (residual), fC | - | 1.8 | 8 |
Noise, fC | 1.4 | 0.2 | 1 |
Noise (residual), fC | - | 0.1 | 8 |
Gain, mV/fC | 8.0 | 0.7 | 17 |
Gain (residual), mV/fC | - | 0.2 | 19 |
Discriminator offset, mV | -31.6 | 31.3 | 17 |
Discriminator offset (residual), mV | - | 14.0 | 19 |
Parameter | Mean | Sigma | Comment |
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Time resolution (RMS), ns | 0.6 | 0.1 | page 1, Fig.2 |
Time resolution (RMS), residual, ns | - | 0.06 | page 4, Fig.2 |
Mean time, ns | 100.3 | 1.0 | page 1, Fig.3 |
Mean time, residual, ns | - | 0.5 | page 4, Fig.3 |
Slewing time, ns | 1.2 | 0.2 | page 1, Fig.3 |
Slewing time , residual, ns | - | 0.2 | page 4, Fig.3 |