bias ASD98b s d1 d2 d3 disc lvds d diffamp/shaper stages s - PowerPoint PPT Presentation

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bias ASD98b s d1 d2 d3 disc lvds d diffamp/shaper stages s d1 d2 d3 disc lvds d 1 2 3 4 g s g s g s g s MDT Electronics - 14 Sept 1999 - E. Hazen MDT Electronics ATLAS ASD99b (Wilkinson) Functions US MDT Signal

bias ASD98b s d1 d2 d3 disc lvds d diffamp/shaper stages s d1 d2 d3 disc lvds d 1 2 3 4 g s g s g s g s
MDT Electronics - 14 Sept 1999 - E. Hazen MDT Electronics ATLAS ASD99b (Wilkinson) Functions US MDT Signal Disc Threshold 1 "TOT" output option Leading Edge Trailing Edge 2 Wilkinson ADC Dead Time output option (time-slew correction) Width = k*Charge (ADC gate)
ATLAS Week, September 1999 ASD - programmable 1) Test pulse injection 3-bit capacitor select 10 fC – 80 fC (8 switched 50 fF - capacitors @ 200mV) 3 8-bit mask register select channels for calibration injection 8 2) Discriminators Location Variable DAC type Res LSB Range comments DISC1 Threshold: VDD/2 ± 128mV VDAC 8-bit 1 mV 256 mV at last gain 8 complementary, > 4 times (R-chain) stage (DA4 nominal threshold (± 30mV) input) Hysteresis: 0 – 20mV CDAC 4-bit 1.875 uA 300 uA 0 – 100mV 4 (0 – 7 prim. Electrons), hysteresis at @ threshold coupling DISC1 DISC2 Threshold: 0 – 128 mV VDAC 4-bit 16 mV 128 mV 4 (R-chain) Hysteresis: fixed 3) Wilkinson ADC Variable Nominal, adjustable range DAC type Res LSB range "run down"-current T NOM = 70 ns, 35 ns - 140 ns CDAC 4-bit 1 uA 16 uA 4 gate (time window) width T NOM = 15 ns, 8 ns - 64 ns - 5-bit - - 5 dead time T NOM = 10 - 20 ns, 0 - 1024 ns - 4-bit - - 4 4) DC Offset (most probably eliminated in bipolar version) Variable adjustable range DAC type Res LSB range DC level after 1. shaper/gain stage few 100 mV 2 x CDAC 4-bit - 16 uA 8 5) Output Channel mode HI, LO, Active, Disable (GND) preamp 2-bit / channel 16 Chip mode TOT (Time Over Threshold), ADC 1-bit 1 Total bits: 57 (63)

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