1 / 14

Preliminary Design Review

Preliminary Design Review. EVLA 1 st and 2 nd Local Oscillators. Specifications – 1 st LO. 12-20 GHz F O = (n*512 MHz +/- FTS) where 23<=n<=40 Tuning Span F o +/- TBD Phase Noise -90 dBc @ 10 kHz @ 20 GHz (x fs) -107 dBc @ 100kHz @ 20 GHz (x fs) Output Power +14 dBm +/- 0.5 db.

haley
Download Presentation

Preliminary Design Review

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Preliminary Design Review EVLA 1st and 2nd Local Oscillators

  2. Specifications – 1st LO • 12-20 GHz • FO = (n*512 MHz +/- FTS) where 23<=n<=40 • Tuning Span Fo +/- TBD • Phase Noise • -90 dBc @ 10 kHz @ 20 GHz (x fs) • -107 dBc @ 100kHz @ 20 GHz (x fs) • Output Power • +14 dBm +/- 0.5 db EVLA LO-IF PDR 22-23 January 2002

  3. Electromagnetically Tuned YIG oscillator by Micro-Lambda Integrated Drivers Requires +15 VDC @ 700mA and +24 VDC @ 50 mA 1.75” Cylinder 1st LO YIG EVLA LO-IF PDR 22-23 January 2002

  4. Specifications - 2nd LO • 10.8 – 14.8 GHz • Fo = n*128 +/- FTS where 84<=n<=116 • Tuning Span: Fo +/- TBD (almost continuous) • Phase Noise • -90 dBc @ 10 kHz @ 14.8 GHz • -105 dBc @ 100 kHz @ 14.8 GHz • Output Power • +14 dBm +/- 0.5 dB EVLA LO-IF PDR 22-23 January 2002

  5. Permanent Magnet YIG Oscillator by Micro-Lambda Integrated Drivers Requires +/- 12 VDC @ 365 & 165 mA and +15 VDC @ 50 mA ~ 7.2 Watts 1” Cube 2nd LO YIG EVLA LO-IF PDR 22-23 January 2002

  6. General Functional Description • Power on reset – report back “OK” • MIB Frequency command • Coarse tune loop (prescaler + MIB) • AGC DAC set to cal data • Loop Closes, Lock to comb +/- FTS • Output tracks FTS • Only monitor data reported back, FTS operates “autonomously” reducing M/C load & RFI EVLA LO-IF PDR 22-23 January 2002

  7. Reference • Herotek Comb Generator • 128 or 512 MHz @ 0 dBm input • Integrated driver amplifier, +15 VDC @ 200mA • “Like” GC526, GC100 • Equalizer (Custom Matched) • Band Pass Filter • Splitter (2 or 4-way) EVLA LO-IF PDR 22-23 January 2002

  8. YIG Isolator Prescaler Coupler AGC Amplifier Output Coupler Output Splitter Mixer L port Mixer R Port Comb Generator Equalizer BPF Splitter (2 or 4 Way) Block Diagram EVLA LO-IF PDR 22-23 January 2002

  9. Mixer I port Band Pass Filter (128 MHz) IF Amplification Band Pass Filter Divider Lock Detector Phase Detector Phase Detector Loop Filter FM Coil Driver (Loop Closed) Block Diagram EVLA LO-IF PDR 22-23 January 2002

  10. Design Considerations • MIB handles most functions • Onboard SRAM holds cal data, etc. • No Mechanical Adjustments • SPI bus devices – DAC’s, ADC’s and digital potentiometers • Design in flexibility in prototype – “EVB” EVLA LO-IF PDR 22-23 January 2002

  11. RFI Considerations • Comb line filtered at source • Continuous wire mesh gaskets • Front panel ?? • Prescaler • Non – RF connectors minimally sized EVLA LO-IF PDR 22-23 January 2002

  12. Monitor O/P Power FTS Power Lock YIG Heater I PLL V and I Frequency (1 MHz) Temperature Control YIG Main Tune AGC Reset FTS Parameters Various Calibration capabilities (NO MECHANICAL!) Monitor and ControlPoints EVLA LO-IF PDR 22-23 January 2002

  13. Front Panel • Lock indicator (not uP dependant) • Frequency • FTS Sample • Reference / Clock Sample • FM coil Voltage / (selectable) EVLA LO-IF PDR 22-23 January 2002

  14. Questions EVLA LO-IF PDR 22-23 January 2002

More Related