270 Keysight E8357D/67D & E8663D PSG User’s Guide
AWGN Waveform Generator
Configuring the AWGN Generator
Configuring the AWGN Generator
The AWGN (additive white Gaussian noise) generator is available for the Arb
Waveform Generator mode and the Real Time I/Q Baseband mode. The AWGN
generator can be configured with user–defined noise bandwidth, noise
waveform length, and noise seed parameters.
— Bandwidth – the noise bandwidth can be set from 50 kHz to 15 MHz.
— Waveform Length – the waveform length is the length in samples of the
noise waveform. Longer waveform lengths provide more statistically correct
noise waveforms.
— Noise Seed – the noise seed selection can be either random or fixed. The
noise seed determines whether the noise waveform data is repeatable
(using the fixed selection) or random (using the random selection).
When the AWGN generator is active, an annunciator, labeled AWGN, is
displayed on the front panel of the signal generator.
Arb Waveform Generator AWGN
1.
Press
Preset
.
2.
Press
Mode
>
More (1 of 2)
>
AWGN
>
Arb Waveform Generator AWGN
3.
Press
Band wid th
>
1.25
>
MHz
.
4.
Press
Waveform Length
>
131072
.
5.
Press
Noise Seed Fixed Random
until Random is highlighted.
This configures a randomly seeded AWGN waveform with a bandwidth of 1.25
MHz and a waveform length of 131072 bits.
Configuring the RF Output
1.
Set the RF output frequency to 500 MHz.
2.
Set the output amplitude to
−
10 dBm.
3.
Press
RF On/Off
.
Generating the Waveform
Press
AWGN Off On
until On is highlighted.
This generates an AWGN waveform with the parameters defined in the
previous procedure. During waveform generation, the
AWGN
and
I/Q
annunciators activate and the AWGN waveform is stored in volatile ARB
memory. The waveform is now modulating the RF carrier.
