This section illustrates how to determine the deviation from a linear phase in the pass band of a 1.09-GHz bandpass filter.
Here, the DUT is evaluated by following the steps.
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Step |
Description |
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The DUT is connected. |
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The measurement conditions are defined. |
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The calibration is executed. |
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The DUT is connected again to execute the auto scale function. |
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The electrical delay is specified. |
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The statistics data function (peak-to-peak) is used to determine the deviation from a linear phase. |
Connect the DUT as shown below.
The measurement conditions are defined by following the steps described below.
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Setup Description |
Key Operation |
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Presetting |
Preset > OK |
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Center frequency: 1.09 GHz |
Center > 1 > . > 0 > 9 > G/n |
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Frequency span: 20 MHz |
Span > 2 > 0 > M/u |
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Measurement parameter: S21 |
Meas > S21 |
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Data format: Expand Phase |
Format > Expand Phase |
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Executing the Auto Scale |
Scale > Auto Scale |
The THRU response calibration is executed.
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Setup Description |
Key Operation |
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Executing the THRU response |
(A THRU standard is connected instead of a DUT) Cal > Calibrate > Response (Thru) > Thru > Done |
The DUT is connected again as shown in Connect the DUT to execute the auto scale.
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Setup Description |
Key Operation |
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Executing the auto scale |
Scale > Auto Scale |
The electrical delay is entered to flatten the phase trace.
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Setup Description |
Key Operation |
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Entering the electrical delay |
Scale > Electrical Delay > Up/Down Arrow keys or Rotary Knob (Flattening a trace) |
The statistics data is used to read the deviation from a linear phase (peak-to-peak).
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Setup Description |
Key Operation |
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Executing the auto scale |
Scale > Auto Scale |
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Displaying the statistics data |
Marker Function > Statistics (Turn it ON.) |
