Stave module with external shunt regulation
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Stave module with External Shunt Regulation. BNL shunts (Dave Lynn/Phil Kuczewsk ). Liverpool Shunts. External shunts provide an alternative source of voltage regulation for a hybrid Hybrids currently come with a distributed shunt scheme ( Mshunt )

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Stave module with external shunt regulation
Stave module with External Shunt Regulation BNL shunts (Dave Lynn/Phil Kuczewsk) Liverpool Shunts

  • External shunts provide an alternative source of voltage regulation for a hybrid

    • Hybrids currently come with a distributed shunt scheme (Mshunt)

      • Regulator circuit on board hybrid with 2 off bypass transistors per ABCN-25

    • External shunt uses an external regulator circuit with a single bypass transistor (mounted on a plug-in)

      • Mshunt disabled by connecting control lines to hybrid (local) ground on plug-in

  • 2 flavours of shunt plug-ins available:

    • BNL shunt, fixed output voltage (preset to 2.6V)

      • 2 off provided, used as a first proof of principle on a module

    • Liverpool shunt, output voltage trimmable over the range 2.6V to 3.0V (set to 2.6V)

      • 8 off available to complement a stavelet


Stave module with bnl shunt regulator results
Stave module with BNL Shunt Regulator - results

3PT Gain Input Noise @1fC

590e

600e

601e

591e

Dtnoise scans

Dtnoise @1fC

Dtnoise @0.75fC

0

662

0

0

AC

AC

1

26

1

0

24510

6822

1243

1259

DC

DC

1249

23929

7559

1262

  • Numbers in black are the sum(hits) for BNL Plug-in

  • Red is the sum(hits) for the on-board shunt regulator

  • Noise bands present irrespective of the shunt regulation scheme with no additional decoupling capacitors


Stave module with liverpool shunt regulator results
Stave module with Liverpool Shunt Regulator - results

3PT Gain Input Noise @1fC

586e

609e

588e

611e

Dtnoise scans with decoupling capacitors added (as prescribed by Peter Phillips)

[email protected]

204

131

  • Dtnoise is clean down to 0.75fC for both BNL and Liverpool shunts

    • Once decoupling is added

  • Dtnoise plot at 0.5fC is shown for Liverpool plug-in

    • Numbers in black are the sum(hits) for Liverpool shunt

    • Red is the sum(hits) for the BNL shunt

93

53

122

1641

85

1444


Summary
Summary

  • External shunt regulation for the powering of module has been shown to work

  • Input noise is as expected at ~600e ENC

  • The Dtnoise scans show noise bands at 1fC – this is true for both the BNL and Liverpool shunts

    • As is the case for the onboard Mshunt

  • Additional capacitive decoupling is required to recover Dtnoise performance

    • Both external shunts provide clean occupancies down to 0.75fC

    • Only at low threshold of 0.5fC do we see evidence of the noise bands

  • Currently have 8 Liverpool shunts tested and (presently being) shipped to RAL for stavelet testing


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