Tera-Pixel APS for CALICE Progress 13 th November 2006.

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Tera-Pixel APS for CALICE Progress 13 th November 2006

PreSample Pixel PreShape Pixel Vth+ Vth- RstSample Cstore Rst Vrst Preamp PreRst Buffer s.f Cpre Cin Buffer s.f --ns Preamp Shaper Rst Cpre Cfb Rfb Rin Cin Vth+ Vth- New

PreShape Pixel PreampSource Follow er ShaperComparator (in- pixel) Comparator (off- pixel) 1.8v- 4.5uA-1.0uA0.5uA0.3uA 2.7uW-1.8uW0.9uW0.5uW Pixel Source followe r Charge (Pre)am plifier Output Source Follow er Comparator (in- pixel) Comparator (off- pixel) 1.8v 0.9uA1.3uA1.2uA1uA750nA 1.6uW2.4uW2.2uW1.8uW1.3uW PreSample Pixel 9.3μW 11.8μW 7.7μW New

PreSample Pixel PreShape Pixel 400 electron hit 60mV typ. 150uV/electron (~flat up to 10,000e- Reduces 50% by 20,000e) 400 electron hit 120mV typ. requires reset (~600ns) 300uV/electron (30,000 electrons as 8 hits simulated ok) Reset Un-reset shaped hit New

PreSample Pixel PreShape Pixel Transient Noise 3.5mV typ at input to comparator ~ 25 electrons Transient Noise 5.9mV typ at input to comparator *√2 = 8.3mV (*√2 due to sampling) ~ 27 electrons (was 32) New

PreSample Pixel PreShape Pixel Signal/Noise optimisation Larger diode capacitance increases noise Signal/Noise optimisation Larger diode capacitance decreases signal (and therefore noise at input as equivalent charge) New

PreSample Pixel PreShape Pixel NWELL = 1.3 x 6.3 μm NWELL = 3 x 4 μm Add 5x9 μm for pmos comparator sub-circuit New

PreSample Pixel PreShape Pixel Risks Cpre feedback cap Risks Cpre feedback cap >10 MIP behaviour Saturation causes pulse elongation (dead time) >10 MIP behaviour Signals over 4000e- may be a problem (needs investigation) Advantages Always active (no reset) Shaper recovers after saturation Below-threshold signals do not integrate on the shaper. Disadvantages Preamp integrates charge (no reset) 20,000 electrons practical max Time-over-threshold up to 1us :  Needs edge-mode logic  Pixel is ‘dead’ during this time Disadvantages Below threshold signals are still integrated by the preamplifier Requires reset after hit  additional logic  dead time after hit Reset sample can contain error Advantages Flexible reset timing Pixel saturation occurs >30,000e- New