FIELDS iPDR – RFS Analog Dennis N. Seitz 1 Solar Probe Plus FIELDS Instrument PDR Radio Frequency Spectrometer Analog Dennis N. Seitz UC Berkeley SSL

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Presentation transcript:

FIELDS iPDR – RFS Analog Dennis N. Seitz 1 Solar Probe Plus FIELDS Instrument PDR Radio Frequency Spectrometer Analog Dennis N. Seitz UC Berkeley SSL

FIELDS iPDR – RFS Analog Dennis N. Seitz RFS Block Diagram 2

FIELDS iPDR – RFS Analog Dennis N. Seitz RFS Analog Section Requirements 3 RFS Analog design requirements Meets Requirements Input Impedance50 Ohms  Input Noise< 4nV/√Hz from 30kHz to 16MHz  4Vpp Bandwidth30kHz to 16MHz  Output Impedance50 Ohms  Thermal Range Survival: -30C to +70C Operational: -25C to +65C (TBR)  44mA = 528mW (secondary power)  Functional Requirements: Five inputs (V1, V2, V3, V4, SCM) Two independent ADC signal conditioning chains Each ADC chain: Single ended measurement of any selected input Difference measurement of any two V1-V4 selected inputs Selectable high or low gain for V1-V4 inputs Balanced differential drive to ±1V range 12 bit ADC

FIELDS iPDR – RFS Analog Dennis N. Seitz FIELDS RFS Analog Breadboard 4

FIELDS iPDR – RFS Analog Dennis N. Seitz RFS Analog Breadboard Testing 5 Bench testing and simulations in progress: Frequency Response Power consumption Harmonic distortion  Noise  Electrical performance over temperature  Characterization of CD4051 multiplexers  Integration with balun/ADC on DCB

FIELDS iPDR – RFS Analog Dennis N. Seitz RFS Analog Peer Review Recommendations 6 N o. Detailed CommentActionStatus 1 Verify the high frequency response of the flight balun transformer by test Agreed. Open 2 Flight parts for CD4051 should be purchased as soon as possible, and they should be characterized to insure they will meet the program requirements in the proposed circuit. Characterize temperature effects on the parts. Procurement in progress Open 3Test conducted noise through CD4051 Noise test to be performed next Open 4 These schematics and slides need to be updated: a. Drawings (page 7, 8 and 9) have to match the design under discussion and the testing that has been done. b. The proper interface circuit from Search coil (same first stage as other instruments?) needs to be inserted into the slides. Drawings updated SCM circuit to be added soon a.Closed b.Open 5 Determine the type of internal calibration needed, and then plan implementation. TBDOpen * No RFAs *

FIELDS iPDR – RFS Analog Dennis N. Seitz RFS Analog Backup Slides 7

FIELDS iPDR – RFS Analog Dennis N. Seitz RFS Analog Breadboard Schematic 8