Measuring SAW Bandpass Filter using Segment Sweep

• Overview

• Procedure

Other Measurement Examples

Overview

This section illustrates how to use the segment sweep function to evaluate a SAW bandpass filter with a center frequency of 947.5 MHz.

Procedure

Here, the DUT is evaluated by following the steps.

1. Determine the Segment Sweep Conditions

The following figure shows the results of evaluating the transmission characteristics of the SAW bandpass filter in the range of 440 MHz to 3 GHz by using the linear sweep.

Transmission characteristics of SAW bandpass filter (440 MHz to 3 GHz, linear sweep)

The measurement conditions are determined for each frequency range. Here, the segment sweep is performed following the sweep conditions shown in the following table.

2. Create a Segment Sweep Table

Follow the steps below to make entries in the segment sweep table.

1. Display the segment table.
    

   Setup Description	Key Operation
   Presetting	Preset > OK
   Displaying the segment table	Sweep Setup > Edit Segment Table

2. Display the IF bandwidth setting column in the segment table.
    

   Setup Description	Key Operation
   Moving the focus to the softkey menu	Focus
   Display of IF bandwidth setting column: ON	List IFBW > ON

When setup items (power level, delay time, sweep mode, and sweep time in this case) are not displayed in the segment table, the setting for the channel in use applies to all segments.

3. Enter the setup data in the segment table.
    

   Setup Description	Key Operation
   Moving the focus to the segment table (select)	Focus
   Segment 1
   Start frequency: 440 MHz	4 > 4 > 0 > M/µ
   Stop frequency: 915 MHz	9 > 1 > 5 > M/µ
   Number of points: 47	4 > 7 > x1
   IF bandwidth: 70 kHz	7 > 0 > k/m
   Segment 2
   Start frequency: 915 MHz	9 > 1 > 5 > M/µ
   Stop frequency: 980 MHz	9 > 8 > 0 > M/µ
   Number of points: 130	1 > 3 > 0 > x1
   IF bandwidth: 100 kHz	1 > 0 > 0 > k/m
   Segment 3
   Start frequency: 980 MHz	9 > 8 > 0 > M/µ
   Stop frequency: 1.035 GHz	1 > . > 0 > 3 > 5 > G/n
   Number of points: 55	5 > 5 > x1
   IF bandwidth: 70 kHz	7 > 0 > k/m
   Segment 4
   Start frequency: 1.07 GHz	1 > . > 0 > 7 > G/n
   Stop frequency: 2 GHz	2 > G/n
   Number of points: 93	9 > 3 > x1
   IF bandwidth: 70 kHz	7 > 0 > k/m
   Segment 5
   Start frequency: 2.6 GHz	2 > . > 6 > G/n
   Stop frequency: 3 GHz	3 > G/n
   Number of points: 41	4 > 1 > x1
   IF bandwidth: 70 kHz	7 > 0 > k/m

 Completed segment table

3. Select the Segment Sweep as the Sweep Type

The segment sweep is selected as the sweep type.

4. Execute the Calibration

In this step, a 2-port Cal using the ECal is executed on both ports.

    1.   Connect the ECal module across test ports 1 and 2.

Connecting the ECal module

    2.   Execute the 2-port ECal.

5. Connect the DUT

The DUT is connected across test ports 1 and 2.

Connecting the DUT

6. Execute the Measurement

A trigger is applied to perform the measurement.

7. Define the Setup for Display

The choice is made between frequency base and order base as the segment display mode.

Segment display: Frequency/Order base