1. SURF ‘n TURF Gary S. Varner University of Hawai, i, Manoa ANITA Collaboration Meeting @ UC Irvine April 7 th, 2005

2. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 1 Talks Overview: 2 parts Sampling Unit for RF (SURF) evolution –Digitization: STRAW, LABRADOR generations –SURFpro evaluation, SURFv1 –Mezzanine card/DDTs Important System Issues: –Power DC draw update RF levels –Timing analysis –Testing plans/issues (TURFpro integration)

3. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 2 Basic trigger/digitizer data stream Split signal: 1 path to trigger, 1 for digitizer Use multiple frequency bands for trigger Digitizer runs ONLY when triggered to save power

4. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 3 Specifications

5. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 4 RF Digitizer checklist Sampling Rate >= 3GSa/s 12-bit ADC performance Analog Bandwidth >= 1.2 GHz Dynamic Range >= 9 bits

6. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 5 LABRADOR sampling & linearity Excellent ADC linearity Sampling rates up to 4 GSa/s with voltage overdrive

7. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 6 -15dB sine wave LABRADOR bandwidth Bandwidth measured by two separate methods: RF sine wave (1050MHz max) and transient impulses

8. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 7 LAB1 dynamic range 1V range = 971 counts (~1 count/mV) Low: 0.4mV/count Mid: 1.5mV/count High: 4.5mV/count

9. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 8 LABRADOR2 – Jing Cao Trans-impedance  source follower –LABRADOR2 ~1mV “noise”, > 1V full scale (and linear + non-inverted) 10 bits should be feasible No changes to RF feed/timing or power Initial testing early ’05 – didn’t understand results

10. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 9 LABRADOR/2 floorplan 8x HS Analog out, 1x MUX out 8 chan. * 256 samples 128x Wilk ADCs Analog “Superbuffers” Straight Shot RF inputs Random access:

11. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 10 LAB2 Test bench LAB2 (indistinguishable from LABRADOR @ this resolution)

12. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 11 LAB2 DC Linearity 1.5 counts/mV Linear Residuals 1.6V dynamic range (DC transfer) Key: Transimpedance  Source Follower Allows operation without input offset

13. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 12 LAB2 Problem Decided for SURF v.1, LABRADOR only option LABRADOR LAB2 For reasonable settling time, need strong sense I; However, closed channels strongly active

14. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 13 LAB3 (?)  Faster Readout: –Why not put an ADC in every storage cell? Readout could be < 100us (40us convert and 50us data transfer) No analog sample transfer (biggest headache) –Give up analog waveform out 9 RF channels (1 dedicated timing) Greatly simplified control Implement 4 bucket “tail catcher” Modified termination scheme –Truly 50  –No resistive drop across array

15. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 14 Architecture Comparison inputinput

16. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 15 Chip comparison LABRADOR, LAB2 LAB3 65 analog/control lines 3-deep nested state machine 41 analog/control lines (better VDD/GND) Very simple state machine

17. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 16 Trigger checklist Good Band spacing Sufficient amplitude through TDD Net length balancing

18. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 17 RFCeval – 0 th order prototype Quick Reference: RFCeval == Radio Freq Comp evaluation board STRAW == Self-Triggered Recorder for Analog Waveforms LABRADOR == Large Analog Bandwidth Recorder And Digitizer with Ordered Readout

19. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 18 SURFpro Pro = Prototype

20. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 19 Diode Detector Test (DDT) Eval Trigger Studies Filter Banding Tunnel Diode DDT Board DDT2 Board Filter Banding Tunnel Diode

21. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 20 Filter Banding some balancing needed band tuning

22. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 21 Modified Bands

23. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 22 Diode detector Response Needs amplification! 2.3  ~= 3.9 P/

24. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 23 SURF v1 SURF High Occupancy RF Trigger (SHORT) board

25. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 24 SURF v1

26. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 25 SURF v2? Improvements (?) –Routing simplification: 5 CPLDs + 1 FPGA  1FPGA More space for LAB(3?) routing – net length balancing –Dedicated reference timing channel? –Remove dedicated comparators? (use FPGA LVDS receivers as comparators – less EMI and power) Triggering OK (?) [isolate changes to SHORT board?]

27. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 26 Online Documentation http://www.phys.hawaii.edu/~idlab

28. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 27 Much progress since last met in autumn –Some RF components STILL on order Plans: –Defer to after the break – additional input SURF board cost ~ 10k$ per board –All RF components (4.8k$ in Tunnel Diodes alone) Part I Summary

29. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 28 Part 2: Important System Issues: –Power DC draw update RF levels –Timing analysis –Testing plans/issues (TURFpro integration)

30. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 29 SURFv1 DC Power -5Vmay go away

31. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 30 SURFv1 RF Power

32. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 31 Timing Path TURF bridges cPCI modules along backplane--sees local trigger pattern across antenna clusters Issues data hold, then digitize if trigger pattern is satisfied 4 4 4 4

33. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 32 Diode Detector Test (DDT) Eval Trigger Studies DDT Board 2 times of interest: 1.Absolute time w.r.t. PPS 2.Channel-to-channel timing

34. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 33 Trigger Timing Measurement 2ns/bin 1.2ns resolution (Spartan-3) Local Oscillator Stability: 5x10 -10 + Freq. Mult. Jitter ~ 1.34ns Not timing resolution!

35. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 34 Timing Fan-out Jitter LABRADOR time encoding –Interpolate HITBUS (hold/Halt): 330ps/SQRT(12) ~ 95ps LVDS/CPLD fan-out jitter – many 100ps TURF fan-out intrinsic timing –To be evaluated –Now have SURF TURF link running, can test Dedicated timing signal (?) –LAB3 provides this option

36. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 35 Trigger Studies

37. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 36 Studies/Documentation Owed SURF User’s Manual (programmer’s manual) TURFIO User’s Manual TURF Trigger Timing measurement results FPGA discriminator study (DDT) Student project: Trigger sensitivity to non- Gaussian noise and self-generated noise

38. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 37 Specifications - anon

39. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 38 Ready for TV test: –Has been useful integration exercise –Most parts TV rated – qualify the rest Plans: –Evaluation of SURFv1 performance –Start serious TURF studies (how many boards needed?) –TV test hardware enough for EM flight Design issues: –More LABs needed (Rev. 1 or 3); when? –SURFv2 ? –Freeze design when? Part II Summary

40. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 39 Back-up slides

41. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 40 Template

42. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 41 Aside: LABRADOR sampling speed High/Low CTRL: Extend to 4 GSa/s Improve odd/event Low freq operation

43. Gary S. Varner, ANITA Collab Meeting @ UC Irvine, April 2005 42 Askaryan Signature Significant signal power at large frequencies Strong linear polarization (near 100%)