Gain & Noise Comparison for Mini-Circuits, Wenteq and U. Penn Amplifier Changguo Lu, Kirk McDonald 8/20/2013.

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Presentation transcript:

Gain & Noise Comparison for Mini-Circuits, Wenteq and U. Penn Amplifier Changguo Lu, Kirk McDonald 8/20/2013

How to make the comparison? A 64 mm 2 mesh APD is used for this comparison. HV is set at -1750V. Use Fe keV X-rays to generate the signal in the APD, then record baseline rms noise and Fe-55 full energy peak.

Mini-Circuits ZX60 amplifier 1mV/div 2ns/div Peak ~ 2.5mV

rms noise with ZX60 amplifier rms noise ~ 0.168mV, S/N ~ 15

Wenteq amplifier 20mV/div 2ns/div Peak ~ 60mV

rms noise with Wenteq amplifier 20mV/div 2ns/div rms noise ~ 3.3mV, S/N ~ 60/3.3 = 18

Fe-55 spectrum with U. Penn’s amplifier

rms noise with U. Penn’s amplifier With U. Penn’s amplifier its S/N ratio ~ 3.3/0.245 = 13.5 The gain of this amplifier is similar to Mini-circuits ZX-60, S/N is also similar. The rise time of U. Penn’s amplifier is ~twice as slow as the other two amplifiers, ~3ns.