Groningen, 1-2 February 2001 FPU Preliminary Design Review1 First Stage Cryogenic IF Amplifier Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN

Groningen, 1-2 February 2001 FPU Preliminary Design Review2 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM Program –New Devices –New Design –Results QM & FM Programs: Fabrication by the Industry –Transfer to Industry –Processes –Components Summary of critical items Planning CONTENTS

Groningen, 1-2 February 2001 FPU Preliminary Design Review3 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review4 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review5 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review6 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review7 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review8 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review9 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM New Design –First prototype using InP TRW 200 devices in both stages –Oscillations? –Substrate glued to the box using epoxy instead solder –MDM connector for the bias circuit –Gate voltage divider included in the bias circuit –Smaller size (58  29  10.5mm) –Mechanical interface with mixer sub-assembly –SMA connectors with “O ribbon” connection (Pending due to delivery of connectors) –Final decision for ESD protection: LEDs or big capacitors (Pending) –EMC filtering (Pending) –Bias circuit in the QM and FM different from that in the DM

Groningen, 1-2 February 2001 FPU Preliminary Design Review10 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM DM 2001   DM  35  12mm 58  29  10.5mm

Groningen, 1-2 February 2001 FPU Preliminary Design Review11 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM

Groningen, 1-2 February 2001 FPU Preliminary Design Review12 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN DM PROGRAM Results Critical Issues: Output Reflection, Gain Stability and Oscillations.

Groningen, 1-2 February 2001 FPU Preliminary Design Review13 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN QM & FM PROGRAMS: FABRICATION BY THE INDUSTRY Transfer to Industry – Industry: Inexperience in space projects at cryogenic temperatures – CAY:  Distribution of QA responsibilities.  Difficulties of small groups in dealing with documentation. Processes – Epoxies (EPOTEK H20E, ABLEFILM 5025) – “O ribbon” connection for SMA connectors – Bonding

Groningen, 1-2 February 2001 FPU Preliminary Design Review14 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN QM & FM PROGRAMS: FABRICATION BY THE INDUSTRY Components – Passive Components 1.- Components are not qualified at cryogenic temperatures 2.- Chip resistors from SOTA, size 0302, only available as commercial part. – LEDs or big capacitors for ESD protection – InP Transistors: Supplying and qualification  JPL – Isolators: Supplying and qualification  Pamtech delays – SMA Connectors: Pin orientation

Groningen, 1-2 February 2001 FPU Preliminary Design Review15 Centro Astronómico de Yebes Observatorio Astronómico Nacional SPAIN SUMMARY OF CRITICAL ITEMS Output reflection Gain stability Oscillations (change of device?) ESD Protection: LEDs or big capacitors EMC filtering Passive components at cryogenic temperature Chip resistors from SOTA, size 0302 Qualification and procurement of Isolators from Pamtech SMA Connectors for “O ribbon” connection