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12 Chapter 1

Getting Started

Option 215 Limitations

Getting Started

Example 2: Sweep With An Offset

Suppose that you specify on your PSA Series analyzer that you wish to

sweep from 2.85 GHz to 3.00 GHz using 601 points and an offset of

1.0 GHz. What is the actual range that the signal source will sweep?

First of all, we need to work out our bucket size, or the bucket width.

This is given by the range in Hertz divided by (number of points minus

1), or

Now we can work out the external source’s start frequency using the

following equation:

Finally we can work out the external source’s stop frequency using the

following equation:

So if you specify on your PSA Series analyzer that you want to sweep

from 2.85 GHz to 3.00 GHz using 601 points and a 1.0 GHz sweep

offset, the signal source itself will actually sweep from 3.84975 GHz to

4.00025 GHz.

Bucket Width (in Hz)

PSA Frequency Span (Hz)

PSA number of Sweep Points 1–

--------------------------------------------------------------------------------=

Bucket Width (in Hz)

150,000,000

601 1–

------------------------------ 250,000 Hz==

PSA Start Frequency Sweep Offset Bucket Width–+

Harmonic Number

---------------------------------------------------------------------------------------------------------------------------------

2,850,000,000 1,000,000,000 250,000–+

----------------------------------------------------------------------------------------------------=

3,849,750,000 3.84975 GHz==

PSA Stop Frequency Sweep Offset Bucket Width++

Harmonic Number

---------------------------------------------------------------------------------------------------------------------------------

3,000,000,000 1,000,000,000 250,000++

-----------------------------------------------------------------------------------------------------=

4,000,250,000 4.00025 GHz==

Agilent Technologies PSA Series User Guide

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