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2.500 V REF. 4.7 uF. MONSOON IR Acquisition Aladdin Front End. Aladdin Front End Test Results. 1 k W external load, BW = 7 MHz No filtering/bypassing of OFFSET ADC input adjusted with OFFSET to low level Histogram means are normalized to 50 ADU Ave. mean = 7,498 ADU

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Monsoon ir acquisition aladdin front end

2.500 V REF

4.7 uF

MONSOON IR AcquisitionAladdin Front End


Aladdin front end test results
Aladdin Front End Test Results

  • 1 kW external load, BW = 7 MHz

  • No filtering/bypassing of OFFSET

  • ADC input adjusted with OFFSET to low level

  • Histogram means are normalized to 50 ADU

  • Ave. mean = 7,498 ADU

  • Ave. s.d. = 2.37 ADU

Counts

Channel #

ADU


Aladdin front end test results1
Aladdin Front End Test Results

  • 1 kW external load, BW = 7 MHz

  • No filtering/bypassing of OFFSET

  • ADC input adjusted with OFFSET to high level

  • Histogram mean is normalized to 50

  • Ave. mean = 59,566 ADU

  • Ave. s.d. = 2.36 ADU

  • Histograms less smooth at high input level


Aladdin to orion front end changes
Aladdin To Orion Front End Changes

  • 100 kW internal load resistor increased to 10 MW

  • Bipolar input AD8021 op amp replaced with FET input OPA627

  • Large 2.2 mF bypass capacitor placed on incoming OFFSET

  • Gain reduced from 3.0 to 2.5

  • BW reduced from 7 MHz to 3 MHz.


Monsoon ir acquisition orion front end

2.500 V REF

4.7 uF

MONSOON IR AcquisitionOrion Front End


Orion front end test results
Orion Front End Test Results

  • 1 kW external load, BW = 6 MHz

  • OFFSET bypassed with 2.2 mF.

  • ADC input adjusted with OFFSET to low level

  • Histogram mean is normalized to 50

  • Ave. mean = 7,501 ADU

  • Ave. s.d. = 1.68 ADU

Counts

Channel #

ADU


Orion front end test results1
Orion Front End Test Results

  • 1 kW external load , BW = 3 MHz

  • OFFSET bypassed with 2.2 mF.

  • ADC input adjusted with OFFSET to high level

  • Histogram mean is normalized to 50

  • Ave. mean = 57,810 ADU

  • Ave. s.d. = 1.72 ADU

  • Smoother at high level input than Aladdin


Monsoon ir acquisition current tests
MONSOON IR AcquisitionCurrent Tests

  • ADC input voltage vs. Offset code

  • Histograms of 1 kW input load to ground for low/high level offset.

  • Histograms of D.C. input for low/high levels

  • Histograms of dynamic step input on even/odd channels

  • Sinewave input to get frequency spectrum

  • Sinewave input to get DNL, and maximum INL


Orion test system
Orion Test System

  • 1 IR Acquisition mother and daughter board in test.

  • 1 IR Acquisition mother and daughter board nearly complete pending test results of first board.

  • 1 Clock and Bias board 80 % done.

  • Chassis and CPCI backplane integrated.

  • Power supplies on hand.


Monsoon ir acquisition conclusions concerns
MONSOON IR Acquisition Conclusions/Concerns

  • About 1.7 ADU noise performance with Orion design for static 1kW source.

  • Orion design BW = 3 MHz greater than necessary for Orion’s 1.5 msec pixel time @ 10 fps.

  • Histograms become jagged at higher input levels.

  • Unable to fit recommended Vref capacitor (47 mF) for AD7671 on board.