1 / 22

RBSP-EFW CDR 2009-09-30

RBSP BOOM ELECTRONICS BOARD (BEB) Electronic Design and Verification Critical Design Review Jane Hoberman. RBSP-EFW CDR 2009-09-30. 1. BEB Review Outline. Overall BEB design goals - Changes since PDR - Reviews

loretta-marinel
Download Presentation

RBSP-EFW CDR 2009-09-30

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. RBSP BOOM ELECTRONICS BOARD(BEB) Electronic Design and Verification Critical Design Review Jane Hoberman RBSP-EFW CDR 2009-09-30 1

  2. BEB Review Outline • Overall BEB design goals • - Changes since PDR • - Reviews • Sub circuit design, performance requirements and verification: • - Floater Driver • - Bias, Usher and Guard Driver • - EFW/ Emfisis Buffer • - Ground Diagram • How well does the BEB meet it Specification? • - Power • - Mass • - Specification Table • - Parts (including Stress Analysis) • Status RBSP-EFW CDR 2009-09-30

  3. EFW BLOCK DIAGRAM RBSP-EFW CDR 2009-09-30 3

  4. BEB Design Drivers - The Bias Drivers will provide current biasing of sensors. - The Usher and Guard Drivers will provide voltage biasing of photoelectron control surfaces. - The Floating Ground Driver will provide the reference source for each preamp ground, with a range of +/- 215 V with respect to SC ground. - The BEB will provide “Bias”, “Guard”, & “Usher” programmable DC offset potentials with readback. - The BEB will provide an AC test signal source to preamps. - The EMFISIS buffer will deliver buffered, low-noise, analog, difference E-field signals to EMFISIS-WAVES from 10 Hz to 400 kHz. RBSP-EFW CDR 2009-09-30 4

  5. New RBSP BEB Design Elements BEB is based on CRRES, POLAR, and most recently, THEMIS heritage. Changes from Themis BEB Design (no significant design changes since PDR): +/-225 V output stage increased from +/-100 V, in order to increase Floating Ground and BIAS driver range. - New High Voltage Transistors and Capacitors - Increase in biasing range, thus rail to rail op amp required - Layout for 480V between some parts and traces Floating Voltage increased to +/-15V from +/-10V - change in some bypass capacitors DAC commanding, and AC Test generation in DCB. EMFISIS circuit added - extra power and space requirements - additional noise and frequency response requirement Contingency operation without IDPU interface. Removed from BEB: Actel, braid circuit, RTD RBSP-EFW CDR 2009-09-30 5

  6. BEB REVIEWS PCB Layout Review 6/30/09 New PCB layout instituted the previously listed changes plus those below. PCB layout and schematic was reviewed . All concerns addressed. Peer design review 9/2/09. No issues. Circuits additions since PDR: Additional filtering for to reduce 200kHz line. Insure no over voltage operation of floaters. RBSP-EFW CDR 2009-09-30 6

  7. BEB BLOCK DIAGRAM RBSP-EFW CDR 2009-09-30 7

  8. BEB Floating Ground Driver Performance Requirements Frequency Response: LP: 3 dB roll off at 300 Hz. Output Dynamic Range: ± 215 Vdc wrt. SC GND. Output: references Preamp floating power supply (±15Vdc wrt. FGND). Opposing booms matched to 0.1% accuracy, DC to .5Hz. Output level shall track Vsphere to at least .1% , from DC to.5Hz, 0V to 215V RBSP-EFW CDR 2009-09-30 8

  9. BEB BIAS DRIVERSchematic almost identical to Guard, Usher driver Performance Requirements Frequency Response: LP: 3 dB roll off at 300 Hz. Dynamic Range: ± 175 ± 40 (Vref) Vdc wrt. AGND, where full-scale DAC → Vref = ± 40 Vdc). Opposing booms matched to 0.1% accuracy, DC to .5Hz (BIAS). Gain of 1 with .1% tolerance. (Track Vsphere better than .1% from DC to .5Hz). Noise Level: < 48 uVrms 10 to 10KHz; < 35 uVrms 10K to 400KHz AC distortion < -40dB THD with +/-50VDC +/-100 Vp-p AC DAC Resolution:1 nA DAC Accuracy (BIAS): opposing booms matched to 0.1% DAC step response: <25mS RBSP-EFW CDR 2009-09-30 9

  10. BEB BIAS AC DISTORTION Vsphere = 26Vpp AC RBSP-instrument name CDR yyyy-mm-dd 10

  11. BEB Bias, Usher, Guard Frequency Response RBSP-instrument name CDR yyyy-mm-dd 11

  12. EWF to EMFISIS Buffer RBSP-EFW CDR 2009-09-30 12

  13. BEB GROUNDING RBSP-EFW CDR 2009-09-30 13

  14. BEB Power Table * The maximum current of the +10V and -10V supplies are interdependent. The maximum current is dependent on the DAC setting. ** The maximum current of the +225V and -225V supplies are interdependent. The maximum current is dependent on the V sphere input. RBSP-EFW CDR 2009-09-30 14

  15. BEB ETU 1 BEB ETU Mass: 455 grams RBSP-EFW CDR 2009-09-30 15

  16. BEB Performance Compliance RBSP-instrument name CDR yyyy-mm-dd 16

  17. BEB Performance Compliance (con’t) RBSP-instrument name CDR yyyy-mm-dd 17

  18. BEB EMFISIS Performance Compliance *Includes room noise and EMFISIS instrument **Not expected to be significantly different from Spin Plane test RBSP-instrument name CDR yyyy-mm-dd 18

  19. BEB Parts and Quality assurance Compliance Stress Calculations done on all parts. Spread sheet available. RBSP-instrument name CDR yyyy-mm-dd 19

  20. BEB Summary of Documentation Status RBSP-instrument name CDR yyyy-mm-dd 20

  21. BEB: Test and Build Status Finishing testing of ETU 2 - Complete verification of layout - AC , and AC +DC distortion test - Noise testing 2.Continue Functional Test of BEB with IDPU and Booms - Axial Boom - with 6 preamps - noise characterization 3. EMFISIS Testing - Axial plane test 4. Complete AD822 screening 5. Thermal testing for calibration purposes 6. Update ETU test plan for Flight RBSP-instrument name CDR yyyy-mm-dd 21

  22. BEB BACK UP RBSP-instrument name CDR yyyy-mm-dd 22

More Related