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STAR Light PDR – 3 October 2001

Objective To design, build and test RF front end receiver as small as possible, meeting requirements and within budget. Strategy Parts search and noise budget iterations. RF RECEIVER Line van Nieuwstadt 734-615-2252, linevn@umich.edu. STAR Light PDR – 3 October 2001. Outline:

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STAR Light PDR – 3 October 2001

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  1. Objective To design, build and test RF front end receiver as small as possible, meeting requirements and within budget.Strategy Parts search and noise budget iterations RF RECEIVERLine van Nieuwstadt734-615-2252, linevn@umich.edu STAR Light PDR – 3 October 2001

  2. Outline: • Requirements & Noise Budget • Block Diagram • Component Selection and Trade-offs • Component Testing and Summary • Test plan for 2-channel propotype STAR Light PDR – 3 October 2001

  3. Requirements (from Noise Budget) Frequency : 1.4135 GHz +/- 10MHz NF : 2.5 dB Gain : ~ 90 dB Pdc : < 8.5 Watts Size : ~ 5” x 5” x 1.5” (12.5 cm x 12.5 cm x 4cm) Weight : < 300 gr. Temp : –30C to +40C (operating) STAR Light PDR – 3 October 2001

  4. Block Diagram Cold Cal Load SP4TSwitch AMP AMP IRF LNA IRF Antenna A/D AMP PSF 8-way Power Divider A Noise Diode A Noise Diode B 8-way Power Divider B STAR Light PDR – 3 October 2001

  5. DC Power Summary: STAR Light PDR – 3 October 2001

  6. Selected parts specs: LNA: Miteq AFSM2 Freq. : 1.0 – 2.0 GHz Gain : 25 dB +/- 1 dB NF : 0.8 dB VSWR : 1.4:1 @ 1.5 GHz Pdc : 12V @ 90mA (1.1 W) Temp. : -55C to +85C AMP: MAAM 12000-A1 Freq. : 1.2 – 1.75 GHz Gain : 26 dB +/- 0.8 dB NF : 1.35 dB VSWR : 1.4:1 P1dB : 14 dBm Pdc : 5V @ 85mA (0.43 W) Temp. : -55C to +125C PSF: IMC 930307 ceramic Freq : 1413.5 MHz +/- 10 MHz I.L. : 3 dB VWSR : 1.75:1 Rejection : 1393.5 MHz, 32 dB min. 1433.5 MHz, 30dB min Temp. : -30C to +40C STAR Light PDR – 3 October 2001 Power Divider: MECA 808-2-1.400 Frequency : 0.8 - 2 GHz Insertion Loss : 0.8 dB (above 9 dB) Ampl. Imbalance : 0.2 dB Phase Imbalance : 8 degrees VSWR : 1.2:1 Port-to-port isol. : 22 dB, adjacent Temperature : -55C to +70C Size : 4.5” x 4” x 0.44” Noise Diode: NC302L Frequency : 10 Hz - 2 GHz Pdc : 6 – 8 V @ 6 mA Output ENR : 30 – 35 dB

  7. Test Plan/Procedure/Fixtures - Components: • Procure selected components (LNAs, filters, power dividers) • Design and fabricate test fixtures • Assemble engineering test devices (Miteq and Ma/Com LNAs, PSF filters) • Test components over temperature: -30C to +40C STAR Light PDR – 3 October 2001

  8. Test Plan/Procedure/Fixtures: STAR Light PDR – 3 October 2001

  9. Test Plan/Procedure/Fixtures: STAR Light PDR – 3 October 2001

  10. Test Results Summary - Components: • Miteq LNA: Good NF (<0.7dB), burn-in is necessary, requested pricing/delivery info from vendor • Ma/Com LNA: Linear gain vs. temperature curves, purchased fifty amplifiers for instrument built • PSF Filters: Mounting and test fixture problems solved, very small filter-to-filter variation • 8-way Power Dividers: Selected MECA power divider STAR Light PDR – 3 October 2001

  11. Test Results Summary - Components: STAR Light PDR – 3 October 2001

  12. Test Results Summary - Components: STAR Light PDR – 3 October 2001

  13. Test Results Summary - Components: STAR Light PDR – 3 October 2001

  14. Test Results Summary - Components: STAR Light PDR – 3 October 2001

  15. Test Plan for 2-Channel Prototype Radiometer: • Implement RF test ports in the receiver box • Measure NF of RF front ends (switches, IRF, LNA) • Measure S-parameters of RF front ends and gain block, at Troom and over operating temperature • Test fringe-washing function over temperature STAR Light PDR – 3 October 2001

  16. STAR Light PDR – 3 October 2001

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