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SPP FIELDS RFS Analog Peer Review 24OCT2013

SPP FIELDS RFS Analog Peer Review 24OCT2013. FIELDS RFS Analog Breadboard. RFS Block Diagram. RFS Analog Section Requirements. Functional Requirements: Five inputs (V1, V2, V3, V4, SCM) Two independent ADC signal conditioning chains Each ADC chain:

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SPP FIELDS RFS Analog Peer Review 24OCT2013

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  1. SPP FIELDS RFS Analog Peer Review 24OCT2013

  2. FIELDS RFS Analog Breadboard

  3. RFS Block Diagram

  4. RFS Analog Section Requirements • 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 selected inputs (V1-V4) • Selectable high or low gain for V1-V4 inputs • Balanced differential drive to ±2V range 12 bit ADC

  5. RFS Analog Section Components All components are SQPL and at least 100krad except for output balun transformer – will have to be designed and built in-house at UCB SSL

  6. RFS Analog Breadboard Schematic

  7. RFS Analog Input Mux and Amp Attempted differential measurement between coax center and shield with shield terminated through larger resistor does not work – explore values of RSAT (e.g. R85) AD8001 has plenty of BW But needs ±5, not ±6 Mux Ron x Cout = 29MHz with ±6 supply - increase supplies to ±8?

  8. RFS Analog Diff and Gain Amps Need to reduce impedance between LM6172 and output mux - DC couple! LM6172 requires lower R values for best performance – reduce to 499Ω

  9. RFS Analog Output Mux and Amp Output mux Ron x Cout also limits BW - increase supply to ±8 - CD4052 dual 4:1 has ½ Cout but hard to procure… Balun transformer (not shown) yet to be tested - using Mini-Systems commercial part for BB but will have to design in-house for EM and flight Output LM6172 will be reconfigured as 2 pole lowpass and R42 reduced to 50Ω for ÷2; 4Vpp => 2Vpp for ADC

  10. RFS SCM input buffer Nothing here yet! Plan to standardize on input buffers used on TDS and DFB

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