# Presentation: 552734

## MIMO3Preliminary Test Results

## MimoStar3 Status

**Evaluation of MimoStar2 chip**
**Test in Laboratory + Beam test at DESY ****+ ****Irradiation test**
**100% yield with RadTol pixels on ****15**** chips **
**MimoStar2 performances meet STAR requirements**
**End of June 2006: Submission engineering run**
**Two types of substrates (14, 20 μm EPI)**
**Reception (Oct. 2006) ******** test (up to Feb. 2007)**
**Missing HRES layer (option) in fabrication**
**High diode leakage current**
** ****	**
**Re fabrication with HRES (Jan. 2007)**
**VTFPP out of spec (discussion ~ 1 month)**
**Reception (April 2007) ******** wafer test**
**High diode leakage current**

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## 1st Run: MimoStar3 Test

**MimoStar3 with 20 μm EPI substrate:**
**~100% pixel work **
**2 chips tested on PCB (CK @ 25 & 50 MHz )  **
**5 on probe station (CK @ 60 KHz)**** **
**High ENC, ****Ex. ENC ~ 20 e****-****, @ 20 °C, t ****r.o.**** = 4 ms**
**Confirmed by static diode leakage current measurements:**
**4-7 times higher than M*2 @ room T (I****Leak****< 5 fA/diode)**

**M*3**

**M*2 (14 μm EPI)**

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## 1st Run: MimoStar3 Test

**MimoStar3 with 14 μm EPI substrate:**
**Seems less noise**
**Ex. ENC ~ 18 e****-****, @ 20 °C, t ****r.o.**** = 4 ms**
**Confirmed by static diode leakage current measurements: **
**Diode leakage current 3-6 times higher than M*2 **

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## 1st Run: MimoStar3 Test

**MimoStar3 with 14 μm EPI substrate:**
**Seems less noise**
**Ex. ENC ~ 18 e****-****, @ 20 °C, t ****r.o.**** = 4 ms**
**Confirmed by static diode leakage current measurements: **
**Diode leakage current 3-6 times higher than M*2 **
**"Dead" pixel zone for all tested chips: yield?**
**7 chips tested on PCB (CK @ 25 & 50 MHz ) **

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## Wafer Map (2nd Run) Diode Leakage Current:

**M*2 as ref ******** Static I****Leak****< 5 fA/diode**
**M*3  I****Leak ****should be < 1 nA  for a pixel array of 320x640**
**Even in the centre of wafer, I****Leak **** = 2 x  I****Leak ****of M*2**

**Wafer 20 μm EPI**

**Wafer 14 μm EPI**

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## MimoStar3 (1st & 2nd Run)

**Problems:**
**High diode leakage current**
**Dead pixel zone (1st Run)**
****** ****Is there any relationship between these problems?**
**Why? **
**no explanation for the moment**
**Notice!**
**Only radtol pixel on M*3**
**M18 on same reticule use standard diodes**
**10 chips (14&20 μm) tested without yield & leakage current problems**
**Next steps:**
**More extensive tests on the wafer & PCB for all chips of reticule**
**Establish contact with AMS, propose design/techno review**
**Is there any impact of pixel geometries on the yield for ~reticule size?**

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## Ultimate MIMO 

## Ultimate Chip: MimoStarXXL

**Geometries:**
**Pitch: 18.4 μm ******** radiation hard consideration**
**Pixel Array: 1024 x 1088**
**Active surface: 18.84 x 20.02 mm****2**** **
**~ 1.1 x 10****6**** pixels / frame**
**Read out speed:**
**t ****R.O.****: 200 μs / frame ******** 200 ns /line**
**>~ 5 x 10****9**** pixels / s ******** Need zero suppression system**
**According to STAR analysis**
**Hit  density rate (inner barrel) 2.4x10****5**** /cm****2****/s**
**< 200 hits/frame (200 μs)**
**~ 2000 pixels / frame**
**Pixel Data: **
**21 bits (addresses) **
**1-3 bits (ADC) **
******  ****22 - 24 bits / pixel**
**Effective data stream: ~ 240 MBit/s**** **

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## MimoStarXXL: Proposed Architecture

**Pixel array: 1024x1088 (18.4 μm) Pixel with CDS****Readout: row by row**** **
**	****Matrix divided in 17 groups**
**ADC (1 bit) at the bottom of each column**
**Find N hits for each group****Find M hits for each row****(with N & M determined by pixel array occupancy rate)**** **
**Memory which stores M hits (2 frames) + Serial transmission**

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## MimoStarXXL: Status

**Radtol Pixel with integrated CDS:**
**Functionality tested in M8, M16**
**18.4 pitch pixels will be implemented in M22 **
**Submission Sept. - Oct. 2007**
**Test at beginning of the next year**
**1088 discriminators: **
**Tested in a pitch of 25 μm in M8, M16**
**Implemented in M22**
** ****Zero suppression circuit:**
**Prototype Suze-01 will be submitted at end of June 2007**
**Test from September **

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007

## MimoStarXXL: Power Management

**Using trigger **
**To reduce mean power consumption **
**To decorrelate acquisition and readout**
**Proposition**

| Pixel Pitch (μm) | Pixel | Discri. | Group Hits Finder | Line Hits Finder
(mW) | Sq.  controller
(Pix+Dig) | Memory
(mW) | LVDS receiver
(mW) | LVDS trans.
(mW) | Total (mW) | Power (mW/cm2) |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 20 | 205 mW
0.2 x 1024 | 308 mW
0.3 x 1024 | 240 mW
15 x 16 | 6 | 20 | 34 | 8 | 8 | 829 | 208 |
| 18 | 218 mW
0.2 x 1088 | 327 mW
0.3 x 1088 | 255 mW
15 x 17 | 6 | 20
 | 34 | 8 | 8 | 876 | 220 |

- MIMOSTAR    christine.hu@ires.in2p3.fr

- 16/05/2007