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Chapter 4 119
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 119
• “Using External Leveling” on page 120
• “Creating and Applying User Flatness Correction” on page 123
• “Adjusting Reference Oscillator Bandwidth (Option UNR/UNX)” on page 134
Using the ALC
Selecting ALC Bandwidth
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
To Select an ALC Bandwidth
Press Amplitude > ALC BW > 100 Hz, 1 kHz, 10 kHz, or 100 kHz.
This overrides the signal generator’s automatic ALC bandwidth selection with your specific selection.
For waveforms with varying amplitudes, high crest factors, or both, the recommended ALC loop
bandwidth is 100 Hz. Limiting the loop bandwidth of the ALC circuit will prevent the ALC from
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