iTest+® FemtoStepper Spec - Spectratime

iTest+® FemtoStepper SpecOctober 22, 2009PRELIMINARYUltra-High Resolution FemtoStepper100fs Resolution Phase StepperEasy-to-Use RF Device & Compact light weightCalibration | Time Transfer | Doppler Shift Compensation | InstrumentApplications©SpectraTime Europe Headquarters North America Sales Officessales@spectratime.com +41.32.732.16.66 +1.512.470.3980spectratime.comSpecifications are subject to change without prior notice

iTest+® FemtoStepper SpecFemtoStepper Features• Power supply requirement• Compact• Input Frequency• Output Frequency• Step size• RS232 standard interface• No calibration required• Internal Bit Alarm: AC input 85-264VAC / 47-63Hz: 2U rack mount chassis: 10 MHz: 4 x 10MHz: ≤ 0.1ps: 9600 b/sKey Application Features :• Easy to use• Compact• High resolution• COM standard interface• Low noise performance• Light weightKey Applications :• Time Keeping• Time Lab device• Time Transfer• Doppler Shift Compensation©SpectraTime Europe Headquarters North America Sales Offices Page 2 of 6sales@spectratime.com +41.32.732.16.66 +1.512.470.3980spectratime.com

iTest+® FemtoStepper SpecSystem DescriptionAs illustrated in Figure 1, the main feature of the FemtoStepper is to adjust the output frequency bycontrollable steps without changing the behavior of the master reference clock. A mechanical layoutof the system illustrated in Figure 3.This function is very useful in applications where users need to compensate the master clockfrequency drift (or the Doppler shift in satellite communications system) without changing its internalparameters. Thus, the behavior of the master clock can be assessed during a complete experiment.MasterClockRef frequencyPhaseStepperOutputFrequencyFigure 1- Application DiagramArchitectureAs illustrated in Figure 2, the FemtoStepper architecture includes 2 functions: the Stepping andCommand.RS232CommandFunctionStep + Step -10MHz RefSteppingFunction10MHZOutput10MHzDistributionOOLFigure 2 - ArchitectureThe basic feature is to command the output phase/frequency by sending controllable steppingcommands through the RS232 interface. Each step change the output phase by 0.1ps.©SpectraTime Europe Headquarters North America Sales Offices Page 3 of 6sales@spectratime.com +41.32.732.16.66 +1.512.470.3980spectratime.com

iTest+® FemtoStepper SpecFigure 3 - Mechanical Layout©SpectraTime Europe Headquarters North America Sales Offices Page 4 of 6sales@spectratime.com +41.32.732.16.66 +1.512.470.3980spectratime.com

iTest+® FemtoStepper SpecRS-232 Interface FunctionalityThe FemtoStepper can accept the following basic ASCII commands: Data is in decimal ASCII code.CommandnameIdentificationSyntax command Data field (if any) Response syntax Response data (ifany)ID- TNTMPS-aaa/rr/s.ssaaa: 001rr: revision numbers.ss: software versionSerial numberSN- xxxxxx xxxxxx : 6 digits serial nbryy : always 00 (for future use)xx : HEX ASCIIStatus ST - yyxxBit signification :Bit 7 :-Bit 6 :backup power activeBit 5 :primary power activeBit 4 :-Bit 3 :frequency offset not 0Bit 2 : stepping activityBit 1 : OOL -Bit 0 : OOL +Single PhaseStepPSss= + : Positive Steps= - : Negative Stepss: signes= + : Positive Steps= - : Negative StepPacket PhaseStepPSsdddddds=+ : Positive Packet Steps=- : Negative Packet Stepdddddd: numbersdddddds:signes=+ : Positive Packet Steps=- : Negative Packet Stepdddddd: valueActual phaseoffsetFrequency offsetPHFAsddddds= + : Positive offsets= - : Negative offsetddddd: number- sdddddd s:signes=+ : Positive Packet Steps=- : Negative Packet Stepdddddd: valueFrom 000000To 500000sdddddds= + : Positive offsets= - : Negative offsetdddddd: valueActual frequencyoffsetFR - sdddddds= + : Positive offsets= - : Negative offsetdddddd: valueAlign PPSOUT toPPSREFSet PPSOUTdelay (rounded to200ns)Send informationevery secondALdDEdddddddddBTxd= 1 : alignd= ? : alignment status dddddddddd=delay in ns.Max 999999800????????? :interrogationx= 0 : Stop to sendx= 3 : PPSRef positionx= 5 : Statusdddddddddx= 3 : aaaaaaaaa sbbbx= 5 : yyxxd= 0: ready for alignmentd= 1: alignment in progressd= 2 : no PPSREFddddddddd=delay in ns.Min 000000000Max 999999800aaaaaaaaa= PPSOUT vs PPSREFdelay in ns.sbbb= fine phase comparator value inapprox. nsyyxx= see ST commandTable 2 : Serial commands summary©SpectraTime Europe Headquarters North America Sales Offices Page 5 of 6sales@spectratime.com +41.32.732.16.66 +1.512.470.3980spectratime.com

iTest+® FemtoStepper SpecELECTRICALTypeInput reference frequencyInput reference amplitude / impedance10MHz input reference connectorNumber of outputs10MHz outputs amplitude / impedance10MHz outputs connectorsSPECIFICATIONSFemtoStepperStandard version10MHz< 1.5VRMS / 50ΩSMA female4 x 10MHz1.0V RMS ± 20% / 50ΩSMA femaleMinimum step on 10MHz output≤ 0.1 psMaximum frequency offset range ± 1x10 -9Output jitter without stepping< 0.15 psOutput jitter while stepping< 0.15 psPhase stability (input reference to outputs)≤ 200ps/°CVersus temperaturePhase offset between outputs≤ 10nsPhase stepping commandFrequency offset commandBy RS232By RS232Bit alarmFront panel indicatorENVIRONMENTTypeFemtoStepperTemperatureRelative HumidityOperating 20 to 30°C 10% - 85%Recommended operating 25°C ± 1% 50% ± 10%Storage -25 to 55°CTransportation -25 to 70°CPOWER REQUIREMENTSTypeInput RangeFrequencyPower Consumption @25°CConnector TypePHYSICAL:TypeSizeWeightOrdering InformationFemtoStepperStandard version85-264 VAC47 – 63 HZ< 30W after warm-up230VAC IEC plugFemtoStepperStandard version445 x 300 x 88 mm (2U)5.0 KgFront connector Rack (Option R)FemtoStepper / RTypeoption Rack mount©SpectraTime Europe Headquarters North America Sales Offices Page 6 of 6sales@spectratime.com +41.32.732.16.66 +1.512.470.3980spectratime.com