Power Estimation and Time Walk Compensation

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# Power Estimation and Time Walk Compensation - PowerPoint PPT Presentation

Power Estimation and Time Walk Compensation. Time Walk Compensation. TWC. Cdet 2 x kT. Noise 2 =. gm ( Iamp ) x Tsha. TshaMin = Tamp_rise ~ ( Cdet+Cout )/ gm. Th = 6 Noise. Tsha. TW ~ Tsha x Th / Sig = Tsha x 6 Noise/ Sig. Th. Sig. Cdet x Tsha 0.5. TW ~. TW.

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### Power Estimation and Time Walk Compensation

Time Walk Compensation
• TWC

Cdet2 x kT

Noise2 =

gm (Iamp) x Tsha

TshaMin=Tamp_rise ~ (Cdet+Cout)/gm

Th = 6 Noise

Tsha

TW ~ Tsha x Th/Sig = Tsha x 6 Noise/Sig

Th

Sig

Cdet x Tsha0.5

TW ~

TW

gm (Iamp)0.5 x Sig

(Cdet+Cout)3/2

TWmin ~

gm (Iamp) x Sig

Cf=1

Tsha

Vn2= kT/gm

Iamp

Cdet

Time Walk Compensation
• TWC

Noise2 =

~ 2 e Ileak x Tsha

TshaMin=Tamp_rise ~ (Cdet+Cout)/gm

Th = 6 Noise

Tsha

TW ~ Tsha x Th/Sig = Tsha x 6 Noise/Sig

Th

Sig

Tsha3/2 x Ileak0.5

TW ~

TW

Sig

(Cdet+Cout)3/2 Ileak0.5

TWmin ~

gm3/2(Iamp) x Sig

Cf=1

Tsha

Vn2= kT/gm

Iamp

Cdet

Time Walk Compensation
• Comparison: A: Substrate 20 Ohm cm, depleted 15um, Substrate 2 kOhm cm, B: depleted 150um
• Signal before irradiation 10x in the case B
• E-field in B 10 weaker, tcol 10 longer, trapping is more probable
• Following scenario is possible: Signal A after irradiation 1500e – signal B after irradiation n x 1500e (n << 10)
• Capacitance in the case A for narrow pixels: Cfringe + Carea + Celectronics
• Capacitance in the case B for narrow pixels: Cfringe + 0 + Celectronics
• Capacitance in case B 2x less
• Leakage current in case B 10x higher

Tsha3/2 x Ileak0.5

TW ~

Sig

100.5

TWminB ~

n

Goodif n>3.3

Time Walk Compensation
• TWC

Slow down

Higher amplitude

Loweramplitude

Slow down

Time Walk Compensation
• Noise=8.8mV, Thr=55mV, Bias current=10uA, CompCur = 2+2.5+1, Pixel size = 50x250um (25x200), Ifoll=10, power 360mW/cm2 (amp:200mW)

Max 3600e:468ns

3600e

TW 62ns

TW 62ns

Max 900e:408ns

900e

Time Walk Compensation
• Noise=8.8mV, Thr=55mV, Bias current=10uA, CompCur = 2+2.5+1, Pixel size = 50x250um (25x200), Ifoll=10, power 360mW/cm2 (amp:200mW)

3600e

900e

TW 4ns

Time Walk Compensation
• Noise=8.0mV, Thr=55mV, Bias current=10uA, CompCur = 2+2.5+1, Pixel size = 50x500um (25x450), Ifoll=7, power 180mW/cm2(amp:100mW)

3600e

TW 75ns

900e

Time Walk Compensation
• Noise=8.0mV, Thr=55mV, Bias current=10uA, CompCur = 2+2.5+1, Pixel size = 50x500um (25x450), Ifoll=7, power 180mW/cm2 (amp:100mW)

3600e

900e

TW 5ns

Time Walk Compensation
• Noise=7.9mV, Thr=55mV, Bias current=5uA, CompCur = 2+2.5+1, Pixel size = 50x500um (25x450), Ifoll=5, power 130mW/cm2(amp:50mW)

3600e

TW 116ns

900e

Time Walk Compensation
• Noise=7.9mV, Thr=55mV, Bias current=5uA, CompCur = 2+2.5+1, Pixel size = 50x500um (25x450), Ifoll=5, power 130mW/cm2(amp:50mW)

900e

3600e

TW 8ns