1. ISUAL Sprite Imager Electronic Design Stewart Harris

2. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20012 Outline Imager Circuit and Electronics Design Electronics Design and Fabrication Status

3. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20013 Imager Electronics Locations Daylight Sensor Filter Wheel Motor MCP HV Supply Phosphor HV Supply Front End Electronics (FEC) Electrical Board Filter Wheel Position Sensor

4. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20014 Imager Electrical Block Diagram CCD TEC Intensifier Filter Wheel Motor Filter Wheel Position Sensor Day- Light Sensor Front End Electronics Imager Electrical Board Photocathode Power Supply Motor Driver Phosphor HVPS MCP HVPS J1 J3 J4 J2 Heater and Thermistor Circuits not shown Stim LED

5. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20015 Imager Connector Locator J1 Imager Electrical Board J4 Phosphor High Voltage J3 MCP High Voltage J2 Front End Electronics

6. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20016 Image Intensifier Interface Imager Electrical Board J1 - 44 pin Photocathode Power Supply Image Intensifier - 25 mm MCP-Out -1kV HV Supply Phosphor (Anode -6kV) HV Supply GATE FEC Connector J4 - 9 pinJ3 - 9 pin MCP-In GND

7. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20017 Imager Electrical Board Functions Connections –Thermistors TEC hot side Lens (front and rear) Filter Wheel Filter Motor Daylight Sensor Survival (spacecraft) –Heater Circuits Lens (front and rear) Filter Wheel Survival (spacecraft) –Thermoelectric Cooler (TEC) Power controlled from AEP –Stim Source Active Electronics –Photocathode Power Supply On/off control Gate control from FEC –Filter Wheel Motor Driver Stepper motor (2 phases) Position indicators (2 bits) Interface Ref Doc: 8439-A4F

8. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20018 Motor Controller Schematic

9. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 20019 Photocathode Power Supply

10. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200110 Daylight Sensor Electronics Specifications –Purpose:Control HV Power Supplies On/Off –Number of Channels:2 –Sensor:2 x UDT PIN-44DPI (per Channel) –Spectral band:420 - 780 nm –Field of View:2π –Threshold current:4 nA (sum of 2 photodiodes) (1E6 photons/pixel/sec on Imager) –Range of detection:0.1 to 1000 nA –Output:0 to 5V

11. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200111 Daylight Sensor Schematic One Channel ShownRef schematic: 8798-O9A

12. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200112 Daylight Sensor Circuit Performance

13. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200113 Temperature Stability - Daylight Sensor Circuit

14. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200114 Front End Electronics Interface Data[0..11] –12 bits per pixel PixelClock (PIXCLK) –pixel data strobe FrameValid (FRMV) –indicates duration of frame LineValid (LINV) –indicates duration of line –used only during test Busy (BUSY) –signals start of EXP Acquire (ACQ) –enables modes Event Trigger (ETRIG) –signals Spite Event CommandData (CDI) –serial data interface for upload of camera parameters VoltageMonitor (MON) –switched analog output Power –dc voltages Images are transferred to the AEP in data frames, each frame is 128 lines x 512 pixels Interface Ref Doc: 8652-X7A

15. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200115 Front End Electronics Block Diagram J2

16. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200116 CCD Bias Design

17. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200117 Clock Driver Design

18. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200118 MUX Analog Data Chain Correlated Double Sampling (CDS) ADC CCD Correlated Double Sampling (CDS) ADC Preamp/Clamp Buffer R LOAD Buffer R LOAD CCD Board 8559-O9 Driver Board 8560-O9 Analog Processor Board 8562-O9 RS-422 Drivers OS1 OS2

19. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200119 Preamp Design

20. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200120 CDS Design

21. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200121 Digital Control

22. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200122 Power Supply Design

23. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200123 Image Readout Order CCD array is illustrated showing the order in which pixels are transferred from Imager to AEP 1 2 127 128 Line 1. Each cell represents one pixel 2. Since the CCD is read from two outputs, the image is split in the middle

24. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200124 Data Transfer Timing Line Timing Pixel Timing T frame = 9.6 ms T line = 75  s T pixel = 125 ns N > 512

25. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200125 Imager Electronics Design Status Breadboard fabrication and testing complete Detailed design Completed –FEC Electronics Design Completed –Imager Electrical Board Design Completed –Daylight Sensor Design Completed

26. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200126 FEC Breadboard A breadboard version of the FEC electronics was built to test the design of clock drivers, preamps, correlated double sample (CDS) circuitry and 12-bit A/D conversion.

27. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200127 Breadboard Camera Measurements Measured system gain 29 e-/ADU Measured readout noise < 50 e- rms CCD full well ~ 120,000 e- Dynamic range > 2400:1 Operating Parameters Master clock: 22.5MHz Pixel clock: 7.5 MHz Line clock: 340 kHz

28. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200128 Breadboard Camera Image

29. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200129 ETU Imager Fabrication Status Assembly of ETU Imager –FEC PC board fabrication status: All boards assembled and tested –Imager Electrical board fabrication status: Board etch is in process –Daylight Sensor board fabrication status: Board is assembled and tested –Mechanical parts fabrication status: Machining/fabrication is in process –Electrical / Electronic (EE) Parts status see next page –Optics Parts status see next page

30. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200130 EE Parts and Optics Status

31. NCKU UCB Tohoku Sprite Imager S. Harris CDR 9 Jul 200131 The End