Tera pixel aps for calice
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Tera-Pixel APS for CALICE. Progress 13 th November 2006. PreRst. Rst. Vrst. Vth+ Vth-. Rfb. Cpre. --ns. Cfb. RstSample. Rst. Cpre. Cstore. Buffer s.f. Buffer s.f. Vth+ Vth-. Cin. Preamp. Rin. Cin. Preamp. Shaper. --ns. PreSample Pixel. PreShape Pixel. New.

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Tera-Pixel APS for CALICE

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Tera pixel aps for calice

Tera-Pixel APS for CALICE

Progress

13th November 2006


Presample pixel

PreRst

Rst

Vrst

Vth+

Vth-

Rfb

Cpre

--ns

Cfb

RstSample

Rst

Cpre

Cstore

Buffer

s.f

Buffer

s.f

Vth+

Vth-

Cin

Preamp

Rin

Cin

Preamp

Shaper

--ns

PreSample Pixel

PreShape Pixel

New


Presample pixel1

PreSample Pixel

PreShape Pixel

11.8μW

7.7μW

New

9.3μW


Presample pixel2

400 electron hit

60mV typ.

150uV/electron

(~flat up to 10,000e-

Reduces 50% by 20,000e)

PreSample Pixel

PreShape Pixel

New

400 electron hit

120mV typ.

requires reset (~600ns)

300uV/electron

(30,000 electrons as 8 hits simulated ok)

Un-reset shaped hit

Reset


Presample pixel3

Transient Noise

3.5mV typ at input to comparator

~ 25 electrons

PreSample Pixel

PreShape Pixel

New

Transient Noise

5.9mV typ at input to comparator

*√2 = 8.3mV (*√2 due to sampling)

~ 27 electrons (was 32)


Presample pixel4

Signal/Noise optimisation

Larger diode capacitance increases noise

PreSample Pixel

PreShape Pixel

New

Signal/Noise optimisation

Larger diode capacitance decreases signal (and therefore noise at input as equivalent charge)


Presample pixel5

PreSample Pixel

PreShape Pixel

NWELL = 3 x 4 μm

Add 5x9μm for pmos comparator sub-circuit

New

NWELL = 1.3 x 6.3 μm


Presample pixel6

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

Advantages

Always active (no reset)

Shaper recovers after saturation

Below-threshold signals do not integrate on the shaper.

PreSample Pixel

PreShape Pixel

>10 MIP behaviour

Saturation causes pulse elongation (dead time)

Risks

Cpre feedback cap

New

Advantages

Flexible reset timing

Pixel saturation occurs >30,000e-

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

>10 MIP behaviour

Signals over 4000e- may be a problem (needs investigation)

Risks

Cpre feedback cap


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