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Design of Front-End Low-Noise and Radiation Tolerant Readout Systems. José Pedro Cardoso. Overview. Introduction Training Project Milestones Conclusions. Introduction.

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overview
Overview
  • Introduction
  • Training
  • Project
  • Milestones
  • Conclusions

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

introduction
Introduction
  • “The “GBT Project” is part of the “Radiation Hard Optical Link Project” which aims at developing a radiation hard bi-directional optical link for use in the LHC upgrade programs” ( http://cern.ch/proj-gbt ).
  • There is the need to develop new building blocks to meet the requirements of the Front-End electronics of the future experiments.
  • The goal of the project is to design one or more low-noise, radiation tolerant circuits, either in 90 nm or 130 nm CMOS technologies.
  • In the framework of GBT project, a PLL with a very low phase noise will be designed, with built-in self-test blocks.
  • Tape-out of this circuit is foreseen for May 2010

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

introduction1
Introduction
  • Training
  • On-job training
  • Technical Courses
  • Education
  • Doctoral Programme
  • at FEUP
  • Dissemination
  • Conferences
  • Milestones
  • Important dates for the project
  • Project
  • Low-noise Radiation Tolerant PLL

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

training
Training

Training

Training

Self-training

Interaction with experts

On-Job training

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

training1
Training
  • EPLF Course – “PLLs, VCOs and Frequency Synthesizers“

Ali Hajimiri

    • Modelling and Design of High-Speed VCOs
    • Jitter and Phase Noise in PLLs

MichielSteyaert

    • Low-Power Crystal Oscillators
    • Basic Concepts of PLL Topologies
    • CMOS Prescalers & Advanced Loop Filters
    • Integrated VCOs and Synthesizers

Ian Galton

    • Fractional-N PLLs

John Cowles

    • High Speed Synthesizers for Communications
  • ESSCIRC 2009 Conference

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

training2
Training
  • PhD in Electrical and Computer Engineering

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

1st semester (2009/2010)

    • Microelectronic and Micro-electro-Mechanical Technologies
    • Test and Design for Testability
    • Digital Communication Systems
    • Seminars

2nd semester (2011/2012)

    • Advanced Microelectronic Systems Design
    • Instrumentation and Systems Testing
    • Measure Theory and Stochastic Processes
    • Individual Topics

Education

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

project
Project

Top-levelanalisysusingMatLab

Project

IC Design UsingCadence

Radiation/ performacetests

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

project1
Project

Phase Locked Loop – PLL

  • Digital communication of data is affected by noise
  • There is the need to develop circuit that does data recovering
  • The PLL will act as a Jitter-filter, as well as a clock multiplier and can be used in CDR applications.
  • Is a feedback system that generates an output frequency according to a reference.
  • Compares the output and the input phase of two signals
  • Main blocks:
    • Phase-Detector (PD or PFD)
    • Voltage Controlled Oscillator (VCO)
    • Low-Pass Filter (LPF)
    • Divider or Pre-scaler

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

project2
Project
  • Phase Locked Loop – PLL
  • Based on QPLL characteristics
    • Crystal frequency = 80.1572 MHz
    • Locking range = 40.0786 MHz ± 8 kHz
    • Output Jitter < 15 ps
    • 130 nm CMOS Technology
    • One frequency multiplication mode: × 2
    • Power voltage: 1.2 V
  • 10 GHz VCO for High-Speed Transceiver
    • Very low-phase noise characteristics

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

project3
Project

130 nm CMOS Technology

  • Main focus of this period was the VCO
  • First approach to oscillator design was done with a Colpitts oscillator. Later the cross-coupled pair and a mixture of both.
  • First oscillator designed at schematics level @ 1 GHz
  • Single-ended oscillator @ 10 GHz
  • Differential oscillator @ 10 GHz

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

project4
Project
  • Main concerns for the VCO designer
    • Phase-noise
    • Spurs
    • Variability
  • How can the above effects be minimized ?
  • Phase-noise
    • Phase noise in the 1/f and 1/f2 regions can be upconverted to close-in regions.
    • Symmetry has a tremendous impact on how AM is converted into PM noise, and can be used by designers.
    • A proper choice of the oscillator’s topology leads us to a better response in terms of phase-noise.
  • Spurs
    • Proper design of charge-pump and filter
  • Variability
    • Tank circuit designed with extra capacitors which can be enabled/disable according to the desired center frequency.

12

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

01-10-2009

project5
Project

Main challenges and novelty

  • Design of the VCO
    • Low phase noise
    • Low parasitics
    • Insensitive to process variations
  • Sensitive choice of VCO’s topology
  • Design of several test blocks, that will perform self-test/auto-calibration of the PLL during functioning
  • Determination of the parameters that can be controlled by the test mechanism

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

project6
Project

What to expect from the circuit ?

  • A low noise PLL
  • Embedded Built-in self-test system
    • Jitter Measuring circuit
    • Automatic Amplitude Control/ Automatic Gain Control
    • Automatic Frequency Control
    • Memory to save the settings of the PLL

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

milestones
Milestones

10th of May 2010

Tape-out Crystal PLL

1st of October 2010

Radiation tests

1st of March 2010

First part of the secondment

25th of October 2010

Tape-out LC PLL

Milestones

1st of March 2011

Radiation tests

1st of August 2011

Second part of the secondment

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

conferences
Conferences
  • Targeted conferences:

2010

    • PRIME 2010 – July 2010
    • TWEPP 2010 – September 2010
    • DCIS 2010 – November 2010

2011

    • IM3STW 2011– June 2011
    • DATE 2011– March 2011
    • ITC 2011– October 2011

Dissemination

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

conclusions
Conclusions
  • A top-level modelling is being used to analyse and specify the system, prior to design
  • There are two circuits to be developed:
    • Crystal PLL
    • LC VCO for a 10 GHz PLL
  • The final versions will include self-test building blocks
  • Tape-out of the first circuit should be done during May 2010
  • By September 2010 at least one paper should have been published in one of the conferences

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems

slide18

Thank you for your attention.

Design of Front-End Low-Noise and Radiation Tolerant Readout Systems