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HRS-IF part Agenda. IF Design and Performances Modifications between QM and FM Planning Philippe Caïs. HRS / HIFI bilateral meeting T oulouse 14 September 2004. IF ‘simplified’ schematic. Functional diagram Ampli : G = 59 ±7.5dB 3 mixers Equivalent Frequency plan LO : 175 steps.

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Hrs if part agenda

HRS-IF partAgenda

IF Design and Performances

Modifications between QM and FM

Planning

Philippe Caïs

HRS / HIFI bilateral meetingToulouse14 September 2004

Bilateral Meeting


If simplified schematic
IF ‘simplified’ schematic

  • Functional diagram

    • Ampli : G = 59±7.5dB

    • 3 mixers

  • Equivalent Frequency plan

    • LO : 175 steps

Bilateral Meeting


If performances
IF Performances

  • Some performances (worries)

  • Other concerns

    • Emergency mode  cable loss to high compared to internal loss balance. >2 dB extra loss and extra cable slope…

    • Will come along test with correlator… coming soon

Bilateral Meeting


If aiv program
IF AIV program

Bilateral Meeting


Irm rejection
IRM rejection

Bilateral Meeting


Qm rejection
QM Rejection

Bilateral Meeting


Output spurious
Output spurious

Bilateral Meeting


Spurious test
Spurious test

Bilateral Meeting


Linearity
Linearity

  • Linearity >1%

  • Soft correction?

Bilateral Meeting


Linearity test
Linearity test

Bilateral Meeting


Dynamic range
Dynamic range

  • 4GHz BW cut into small 250MHz Bw independently adjusted in output power (0.5dB step).

  • IF intrinsic smooth ripple over 4GHz is translated into attenuator settings variations for each sub-band.

  • That reduces the window of ‘fine tuning’ for efficiency optimisation and I call that ‘IF internal dynamic range’.

  • Budget seems to fit (see slide)

Bilateral Meeting


Dynamic range test
Dynamic range test

Bilateral Meeting


Ripple budget 1 3
Ripple budget 1/3

  • Output BW to correlator  250MHz

  • Element ripples are ± cumulative

  • QM ripple over 250MHz is about 3dB.

Bilateral Meeting


Ripple 2 3
Ripple 2/3

  • QM results (Room temp.)

Bilateral Meeting


Ripple budget 3 3
Ripple Budget 3/3

  • Ripple FPU (from Nick data)

  • Overall ripple : FPU+ Cable + Internal  7.5dB w.c.

Bilateral Meeting


Change qm fm
Change QM  FM

  • Frequency prescaler Hybrid (see slide)

    • Due to VCO output power  QM NC

    • New VCO spec for FM and new hybrid design (coupling decreased, power supply filtering resistor)

  • Correlator speed: new filter design (see slide)

  • CPPA procurement: RLC footprint changed  new layout for IRM

  • LO pcb : slight changes for DRC compliance (precap)

  • Mechanical weight reduction  work in progress

  • Varnish (IRM and 3C)

Bilateral Meeting


Coupler 1 5
Coupler 1/5

5Ohms Instead of 10Ohms

The right angles have been replaced by rounded angles to decrease risk of failure of 10mils alumina substrate..

11dB coupler (spacing between the two 50Ohms lines : 60µm)

instead of

12.5dB coupler (spacing : 90µm)

Bilateral Meeting


Coupler 2 5
Coupler 2/5

Bilateral Meeting


Coupler 3 5
Coupler 3/5

Bilateral Meeting


Coupler 4 5
Coupler 4/5

Bilateral Meeting


Coupler 5 5
Coupler 5/5

Bilateral Meeting


Bw reduction
BW reduction

  • Due to GaAs freq. Limitation (TBC)  IRM output filter to be change/tuned

  • New LC values to be sorted for new filter shape/same constr.

  • Some parts may be re-ordered thru CCPA?

  • Slight gain variation compensated by atten. pads.

Bilateral Meeting


CPPA

  • Capacitor ATC120 proc. pending  needed for hybrid manufacture. Planning driver. Commercial lot available at MEUSONIC (the one used for QM hybrid manufacture)

  • VCO procurement  delivery date TBC

Bilateral Meeting


Fm improvements
FM improvements

  • FM performances improvement

    • Power consumption  no change expected

    • Mass  a few % lower expected

    • Rejection ? Worries about new CPPA parts (footprint increase, resonnant freq. decrease)

    • Output spurious  Major change

      • need to add filter in both LOs but changes to mech. design.

      • new substrates to be realised (pb of schedule)

    • Linearity  15dB margin for noise is sufficient/power consump.

    • Dynamic range

Bilateral Meeting


Planning
Planning

  • Miteq

    • Delivery FM#1  end May 04

    • Delivery FM#2  end May 04

  • LO

    • Hybrid lot delivery  end April 04

    • LO manufacture  mid June 04

  • IRM

    • Manufacture  mid May 04

    • Alignement & tuning  Mid July 04 polar H

    • Alignement & tuning  Mid Sept 04 polar V

  • IF delivery to CESR FM polar H  mid Sept 2004

  • IF delivery to CESR FM polar V  mid-Nov 2004

Bilateral Meeting


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