Analog Modulation

Configuring ΦM (Option UNT)

To Set the FM Deviation and Rate 1. Press the FM/ΦM hardkey.

2. Press FM Dev > 75 > kHz.

3. Press FM Rate > 10 > kHz.

The signal generator is now configured to output a 0 dBm, frequency- modulated carrier at 1 GHz with a 75 kHz deviation and a 10 kHz rate. The shape of the waveform is a sine wave. (Notice that sine is the default for the FM Waveform softkey. Press More (1 of 2) to see the softkey.)

To Activate FM

1.Press FM Off On to On.

2.Press RF On/Off.

The FM and RF ON annunciators are now displayed. This indicates that you have enabled frequency modulation and the signal is now being transmitted from the RF OUTPUT connector.

DC Offset and External FM

Applying a DC offset to an external FM signal will shift the frequency of the FM signal above or below the carrier frequency, depending on the polarity of the DC level. The amount frequency shift is directly related to the amplitude of the DC level. A DC offset of +1.0 volt or greater will shift the external FM frequency by an amount equal to the maximum deviation setting. For example, if the signal generator CW frequency is 1 GHz and the maximum deviation setting is set to 100 kHz, an external DC- coupled signal with a +1.0 volt DC level used as the modulating source will center the FM signal at 1 GHz + 100 kHz. Keeping the same setup and settings and changing the DC level to +0.5 volts will center the FM signal at 1 GHz + 50 kHz.

Configuring ΦM (Option UNT)

In this example, you will learn how to create a phase- modulated RF carrier.

To Set the RF Output Frequency

1.Press Preset.

2.Press Frequency > 3 > GHz.

To Set the RF Output Amplitude

Press Amplitude > 0 > dBm.

To Set the ΦM Deviation and Rate

1.Press the FM/ΦM hardkey.

2.Press the FM ΦM softkey.

3.Press ΦM Dev > .25 > pi rad.

4.Press ΦM Rate > 10 > kHz.

Chapter 5

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Agilent Technologies E8257D PSG, E8267D PSG Configuring ΦM Option UNT, To Activate FM, To Set the ΦM Deviation and Rate
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E8267D PSG, E8257D PSG specifications

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