5a-4
Theory of Operation
Overview
Overview
The 8648A/B/C/D signal generator covers the frequency ranges shown in the following
table.
The frequency bands are:
• 0.1 to < 249 MHz
• 249 to < 501 MHz
• 501 to < 1001 MHz
• 1001 to < 2001 MHz
• 2001 to 4000 MHz
The output amplitude range is from +10 to -136 dBm except for frequencies 2500 MHz on
the 8648B/C/D where the higher end of the range is +13 dBm.
The 8648A/B/C/D supports AM, FM, and phase modulation. The possible modulation
sources are:
• internal 400 Hz or 1 kHz source
• external ac- or dc-coupled source
• internal 1 kHz plus external dc-coupled source
• internal variable frequency/waveform source (Option 1E2 only)
Model Frequency Range
8648A 100 kHz to 1000 MHz
8648B 9 kHz to 2000 MHz
8648C 9 kHz to 3200 MHz
8648D 9 kHz to 4000 MHz
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