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MONSOON IR Acquisition Aladdin Front End

This document presents the test results and changes made to the Aladdin and Orion front end modules in the MONSOON IR acquisition system. It includes information on the test results with different load and bandwidth settings, as well as the changes made to the internal load resistor, op-amp, bypass capacitor, gain, and bandwidth. Additionally, it discusses the test results and concerns with the Orion design, including noise performance, bandwidth, and histogram quality. The document also provides updates on the progress of the IR acquisition boards and the integration of the chassis and CPCI backplane.

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MONSOON IR Acquisition Aladdin Front End

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  1. 2.500 V REF 4.7 uF MONSOON IR AcquisitionAladdin Front End

  2. 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

  3. 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

  4. 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.

  5. 2.500 V REF 4.7 uF MONSOON IR AcquisitionOrion Front End

  6. 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

  7. 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

  8. 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

  9. 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.

  10. 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.

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