1. NameFIELDS iPDR – Subject Solar Probe Plus FIELDS Instrument PDR Antenna Electronics Box Selda S. Heavner U.C. Berkeley selda@ssl.berkeley.edu 1

2. NameFIELDS iPDR – Subject Agenda 2 Requirements & Specifications Block Diagrams Schematics Layout Mass and Power Parts Schedule Issues

3. NameFIELDS iPDR – Subject AEB Requirements –AEB shall provide ± 15V Floating Voltage to V1, V2, V3, V4 and V5 preamps (heritage RBSP) Input is +5V Analog Efficient >60% Synchronized to 300KHz Isolated secondary voltages 5% output regulation –AEB shall regulate Preamp ±6 V from LNPS to ±5V –AEB shall provide the power and the control signal for the latching relay controls on the preamps (On V5 heater resistors) 3 bias impedances. –AEB shall be a nexus for MF and HF signals from preamp. The signals shall not have any traces on the board. The signals shall arrive on a DB connector and via coax cables (RG316). The signals shall be then connected to TDS, RFS and DFB (also DB connectors). –AEB shall provide housekeeping signals to DCB via multiplexer. 3

4. NameFIELDS iPDR – Subject AEB Requirements 4 AEB Specifications Cont. (heritage: THEMIS, RBSP) Receive Preamplifier Signals –DC Voltage Level : ± 100V w.r.t chassis –Dynamic Range : DC – 1KHz Floating Ground Driver (heritage: THEMIS, RBSP) –AEB provides the reference source for each floating ground used by the Preamps –Input : PAn_LFOUT (preamp signal) –Input Filter: 300KHz –Output Voltage Level: ± 60VDC with respect to AGND –Output : References floating ground supply (± 10VDC)

5. NameFIELDS iPDR – Subject AEB Requirements 5 BIASING VOLTAGES (V1-V4) AEB shall provide programmable biasing voltages to the V1-V4 preamps as follows: BIAS (whip): ± 40 w.r.t preamp output HEATSHIELD: ± 40 w.r.t preamp output STUB: ± 40 w.r.t preamp output BIASING VOLTAGES (V5) AEB shall provide a provide a programmable biasing voltage to the V5 preamp as follows: BIAS (sensor):± 40 w.r.t preamp output

6. NameFIELDS iPDR – Subject AEB1 BLOCK DIAGRAM 6

7. NameFIELDS iPDR – Subject AEB 2 BLOCK DIAGRAM 7

8. NameFIELDS iPDR – Subject AEB 1 Coax DIAGRAM 8

9. NameFIELDS iPDR – Subject AEB 2 Coax Diagram 9

10. NameFIELDS iPDR – Subject AEB 1 POWER BLOCK DIAGRAM 10

11. NameFIELDS iPDR – Subject AEB 1 POWER FLOATING SUPPLY 11

12. NameFIELDS iPDR – Subject AEB 2 POWER BLOCK DIAGRAM 12

13. NameFIELDS iPDR – Subject AEB 2 POWER FLOATING SUPPLY 13

14. NameFIELDS iPDR – Subject AEB FLOATING POWER 14 AEB Breadboard Power Results –The supply is 68% when powered by 3.3V Digital at nominal load –The supply efficiency is expected to rise since MAX256 will be connected to 5V Analog from LNPS. –MAX 256 3W H-bridge driver Has an internal oscillator so if SYNC signal is lost from DCB it will still run Short circuit protection Thermal shutdown Used on RBSP, submitted to APL Jan 2013 for approval Voltage (V)Load Current (mA)Power (W) FV1 P15V 14.0954.150.05849425 FV1 N15V 14.0914.510.06355041 FV2 P15V 14.595.260.0767434 FV2 N15V 14.585.330.0777114 VIN 3.3V124.80.411

15. NameFIELDS iPDR – Subject 15VF POWER SCHEMATIC 15

16. NameFIELDS iPDR – Subject CHANNEL: BIAS STUB HEATSHIELD 16

17. NameFIELDS iPDR – Subject FLOATING GROUND DRIVER 17

18. NameFIELDS iPDR – Subject LAYOUT and PARTS LAYOUT –AEB ETU Layout started in October 2013. –Schematic will be finalized after peer review MASS and POWER –± 12V and ± 100V is now generated by LNPS. Helped mass. –Power updates are submitted to LNPS. No issues so far. PARTS –MAX256 approval submitted to APL January 2013 –DAC121S101 has not been used on heritage designs. Submitted to APL and approved. 12-bit, low power –Multiplexer on AEB UT16MX110. ISSUES –Connecting 12V to heater resistor on preamp (V5) –DAC needs to be at mid-scale when powered on. New DAC is at zero after power on reset. 18