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In this section testing system will be described.
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In this section testing system will be described.
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\secc Frequency synthesis
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\secc Frequency synthesis
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Centralised topology was used for frequency synthesis. One precise high frequency and low jitter digital oscillator was used and other working frequencies are delivered by division from it. This central oscillator has software defined GPS disciplined control loop for frequency stabilisation.\ref{gpsdo} This method was used in order to meet modern requirements on radioastronomy equipment, which needs precise frequency and phase stability on wide area for effective radioastronomy imaging.
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Centralised topology was used for frequency synthesis. One precise high frequency and low jitter digital oscillator was used and other working frequencies are delivered by division from it. This central oscillator has software defined GPS disciplined control loop for frequency stabilisation.\fnote{\url{http://wiki.mlab.cz/doku.php?id=en:gpsdo} SDGPSDO design was developed in parallel to this diploma thesis construction as related project, but it is not explicitly required by specification.}
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\fnote{This design was developed in parallel to this diploma thesis construction as related project, but it is not explicitly required by specification.}
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This method was used in order to meet modern requirements on radioastronomy equipment, which needs precise frequency and phase stability on wide area for effective radioastronomy imaging.
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\secc Signal connectors
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\secc Signal connectors
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Several widely used and commercially easily accessible differential connectors was considered.
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Several widely used and commercially easily accessible differential connectors were considered.
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\begitems
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\begitems
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* <del>[[http://en.wikipedia.org/wiki/Hdmi|HDMI]]</del>
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* HDMI % [[http://en.wikipedia.org/wiki/Hdmi|HDMI]]</del>
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* [[http://en.wikipedia.org/wiki/Serial_attached_SCSI#Connectors|SAS]]/[[http://en.wikipedia.org/wiki/Serial_ATA|SATA]]
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* SATA %{http://en.wikipedia.org/wiki/Serial_attached_SCSI#Connectors|SAS]]/[[http://en.wikipedia.org/wiki/Serial_ATA|SATA]]
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* <del>[[http://en.wikipedia.org/wiki/Display_port|DisplayPort]]</del>
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* DisplayPort %[[http://en.wikipedia.org/wiki/Display_port|DisplayPort]]</del>
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* SAS/miniSAS
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\enditems
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\enditems
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MiniSAS connector was chosen as the best for use in connection multiple ADC modules. This miniSAS connector is compatible with existing SATA cabling system. Translation between SATA and miniSAS is achieved by SAS to SATA adapter cable. This cable is used in servers to connecting SAS controller to multiple SATA hard disc in RAID systems.
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MiniSAS connector was chosen as the best for use in connection multiple ADC modules. This miniSAS connector is compatible with existing SATA cabling system. Translation between SATA and miniSAS is achieved by SAS to SATA adapter cable. This cable is used in servers to connecting SAS controller to multiple SATA hard disc in RAID systems.
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\secc Design of ADC modules
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\secc Design of ADC modules
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