# Presentation: 669698

## Opto-IC/Board

- K.K. Gan
- The Ohio State University

- WBS 1.1.1.3 & 4

- July 9, 2003

- US ATLAS Pixel Meeting

- K.K. Gan

## Outline

- Introduction
- VDC/DORIC
- Opto-board
- Cost and schedule summary
- Conclusions

- US ATLAS Pixel Meeting

- K.K. Gan

## ATLAS Pixel Opto-link

- US ATLAS Pixel Meeting

- K.K. Gan

## OSU Responsibilities

- VDC and DORIC:
- 		 design
- 		 testing of 50% of final production
- Opto-board:
- 		 design and fabrication
- 		 testing of 50% of final production?

- US ATLAS Pixel Meeting

- K.K. Gan

## OSU ATLAS Personnel

- Faculty
- 		K.K. Gan, Harris Kagan, Richard Kass
- Research Associates
- 		Amir Rahimi, Mike Zoeller
- Graduate Students
- 		Kregg Arms, Rouben Ter-Antonian
- Engineers
- 		Mark Johnson, Chuck Rush
- Technicians
- 		Jim Burns, Jason Moore, Shane Smith, Bob Wells

- new

- new

- US ATLAS Pixel Meeting

- K.K. Gan

## Status of VDC/DORIC

- DORIC: 	extract clock and command signal from
- 			bi-phase mark encoded signal received at PIN
- five IBM prototype runs with various improvements and
- changes in response to opto-pack evolution
- four MPW runs plus one with FE/MCC-I1
- VDC/DORIC-I5e were submitted with MCC-I2 as engineering run
- convert from 3-metal MPW layout to 5-metal layout
- minor improvements in DORIC-I5e
- 		this will be production run if performance is satisfactory

- US ATLAS Pixel Meeting

- K.K. Gan

## VDC-I5e: Bright and Dim Currents vs. Iset

- 	dim current is similar to I5 and close to target 1 mA
-   rise/fall times, duty cycle, current consumption within specs

- VDC-I5e: Bright and Dim Currents vs. Iset

**VDC-I5e**

**VDC-I5**

- high power oxide VCSEL

- US ATLAS Pixel Meeting

- K.K. Gan

## VCSEL Opto-pack Evolution

- 	adapted 8-channel p+ VCSEL to use with MT connector
-   converted to oxide VCSEL
- because p+ has been discontinued by Truelight
-  	converted to high-power oxide VCSEL
- because normal oxide has been discontinued by Truelight

- US ATLAS Pixel Meeting

- K.K. Gan

## I-V Curves/Optical Power ofP+, Normal & High Power Oxide VCSELs

- 	p+/oxide VCSELs have similar optical power in operating range (10-20 mA)
- 	oxide VCSELs have larger effective serial resistance
- smaller VCSEL current when driven by VDC

- I-V Curves/Optical Power ofP+, Normal & High Power Oxide VCSELs

**high power oxide (3 arrays)**

**normal oxide**

**high power oxide (2 arrays)**

**p+**

- US ATLAS Pixel Meeting

- K.K. Gan

## I-V Curve of High Power Oxide VCSELs

- 	some VCSEL arrays contain a channel with much larger effective serial resistance
- maximum VCSEL current of 10 mA when driven by VDC
- significantly below target of 20 mA annealing current

- normal oxide

- high power oxide

- p+ with 10 

- high power oxide

- US ATLAS Pixel Meeting

- K.K. Gan

## High Power Oxide VCSEL with Negative Common Cathode

- 	some links have twice as worse PIN current thresholds for no bit errors
- 	measured with all clocks running asynchronically

- 20 mA
- Vc @ -0.2 V

- 10 mA
- Vc @ gnd

- other links @ 80 A

- other links off

- US ATLAS Pixel Meeting

- K.K. Gan

## DORIC-I5e: PIN Current Thresholds for No Bit Errors

- 	PIN current thresholds for no bit errors measured with 44-pin packages
- 	thresholds are low and similar to DORIC-I5
- expect lower thresholds on opto-board as DORIC-I5
- 	upper thresholds > 1200 A
- 	successfully converted reset from active high to low

- US ATLAS Pixel Meeting

- K.K. Gan

## VDC/DORIC/Opto-board Quality Assurance

- LabView programs:		written/tested
- VDC/DORIC QA plan:
- 	currently use packaged chips to exercise QA system
- 	have received probe cards
- 	perform QA with probe station
- 	opto-board QA plan:
- 	perform QA in temperature controlled chamber
- 	QA system almost ready for production

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board

- contains 6-7 optical links:
- 		layers 1 and 2 optical link:
- 		 	2 DORICs, 2 VDCs, PIN/VCSEL (opto-pack)
- 	B layer optical link:
- 		 	2 DORICs, 4 VDCs, PIN/2 VCSEL (opto-pack)
- use BeO for heat management but prototype initially
- 	in FR-4 for fast turnaround and cost saving
- 	 	have four FR-4 prototype runs to accommodate
- 		various design changes in chips/opto-packs

- US ATLAS Pixel Meeting

- K.K. Gan

## Status of BeO Opto-board

- 	30 boards delivered in April
- 	several open vias on each board due to insufficient gold filling
- 		repair with wire-wrap wires

**VDC-I5**

**opto-pack**

- US ATLAS Pixel Meeting

- K.K. Gan

## PIN Current Thresholds for No Bit Errors

- low PIN current thresholds for no bit errors
- independent of activity in adjacent channels
- no design errors

- US ATLAS Pixel Meeting

- K.K. Gan

## Status of BeO Opto-board

- 	31 boards delivered in June
- 	vias overfilled and excess metal ground away
- 		no open vias
- 	17 boards have shorts between power and ground lines
- 	attempt to populate a second BeO board:
- 		opto-pack housing fits well
- 		one DORIC mounted backward
- 		no visible damage to adjacent chip after replacement
- 		board failed to work
- 		replaced both DORICs
- 		opto-board now works!

- US ATLAS Pixel Meeting

- K.K. Gan

## BeO Opto-board from 2nd Batch

**VDC**

**housing**

**DORIC**

**opto-pack**

**latch broken**

**34.7 ****o****C**

**36.4 ****o****C**

**Ambient:**
**22.5 ****o****C**

- US ATLAS Pixel Meeting

- K.K. Gan

## PIN Current Thresholds for No Bit Errors

- independent of activity in adjacent channels
- will produce opto-boards with second vendor

**2nd batch**

**1st batch**

**OSU**

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Link Proton Irradiations

- 	 four 24-GeV proton irradiations at CERN in last three years
- 	OSU designed and fabricated all test systems:
- 	 cold box: 	electrical test of DORIC/VDC
- 	 shuttle: 	test of opto-link on opto-boards

- BER tester

- fibers

- opto-board

- US ATLAS Pixel Meeting

- K.K. Gan

## VDC-I4:  Clock Duty Cycle vs. Dosage

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Bit Error Threshold vs. Dosage

- PIN current thresholds for no bit errors remain constant up to 21 Mrad

**Dosage/VCSEL Annealing Time**

- US ATLAS Pixel Meeting

- K.K. Gan

## Proton Irradiation Summary and Plan

- 	August 2003 irradiation:
- 	double irradiation statistics:
- 			cold box:	four 4-channel DORIC/VDC
- 	shuttle:		four opto-boards

- US ATLAS Pixel Meeting

- K.K. Gan

## Changes in ETC04

- BeO opto-board prototype run with new vendor: $15K
- increase cost for production BeO boards: $30K
- increase cost for SMD mounting of production BeO boards: $3K
- technician for opto-board production: $57K
- no funds allocated in FY04 irradiation:
- need irradiation of random sample of production opto-boards?
- WBS 1.1.1.4 FY04
- 	ETC03: $78K?
- 	ETC04: $78K+$105K

- US ATLAS Pixel Meeting

- K.K. Gan

## Opto-Board Milestones

- 

- 

- ???

- ???

- ???

- US ATLAS Pixel Meeting

- K.K. Gan

## Summary

- can be used for production opto-boards
- BeO prototype opto-board can operate with low PIN current thresholds
- no technical problem is foreseen but first vendor is unsatisfactory

- US ATLAS Pixel Meeting

- K.K. Gan