Chapter 4 129
4 Optimizing Performance
In the following sections, this chapter describes procedures that improve the performance of the
Agilent PSG signal generator.
• “Using the ALC” on page 129
• “Using External Leveling” on page 130
• “Creating and Applying User Flatness Correction” on page 133
• “Using the Option 521 Detector Calibration (Option 521)” on page 146
• “Adjusting Reference Oscillator Bandwidth (Option UNR/UNX/UNY)” on page 147
• “Optimizing Phase Noise and Harmonics Below 3.2 GHz (Option UNX/UNY)” on page 147
Using the ALC
Selecting ALC Bandwidth
CAUTION Internal leveling works from –15 dBm to maximum power.
For internal leveling, the signal generator uses automatic leveling control (ALC) circuitry prior to the
RF output. ALC bandwidth has five selections: automatic, 100 Hz, 1 kHz, 10 kHz, and 100 kHz. In
automatic mode (the preset selection), the signal generator automatically selects the ALC bandwidth
depending on the configuration and settings (see Figure 4-1).
Figure 4-1 Decision Tree for Automatic ALC Bandwidth Selection
RF OUTPUT
< 2 MHz
AM OFF
PULSE OFF
AM OFF
PULSE ON
AM ON
PULSE ON
AM ON
PULSE OFF
ALC BW
100 Hz
ALC BW
1 kHz
ALC BW
10 kHz
No
No No
Yes
Yes
Yes Yes
ALC BW
100 kHz
ARB On
Yes
No
No
Yes
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