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Appendix E: Functional Operation Summary
AWG2021 User Manual
EĆ15
An example is when the CH1 signal is amplitude modulated with the CH2
signal. If CH2 is set to an amplitude of 5 V and an offset of 2.5 V, a 100%
modulated waveform is obtained.
Internal AM mode is useful for such tasks as varying the amplitude of a certain
part of a waveform in real time. Due to the restrictions created by the multiplier
bandwidth and the signal delay due to the amplifiers, filter, etc. — as can be seen
in the block diagram — this circuit is not meant for applications at high
frequencies.
When high frequencies are necessary or when high precision is required, use the
editor. It can handle simple multiplication of waveforms.
This block is an adder circuit using an ordinary operational amplifier. This adder
has a bandwidth of 30 MHz in Add mode. The output is the voltage set for CH1
added to the CH2 signal.
In order to effectively use the CH1 and CH2 filter, offset,and other functions, the
CH2 signal is added before the CH1 filter. Therefore, the CH2 signal output is
not the value set for CH2.
The actual value is (CH2 set voltage
1
@
5
) + CH1 set up value. Adding CH2
value is calculated and displayed at the bottom right of the SETUP menu CRT
screen.
ąCH2 : OFF Upper : 0.2000%
ą50 W Lower : -0.2000%
An example is the display when an amplitude of 2 V and an offset of 0 V are set
for CH2.
For addition, the output size (CH1 + the actual value of CH2) can exceed 5 V. If
so, the signal is distorted.
In Add mode, if for example noise is created on CH2 and this is added to the
CH1 waveform, the amount of noise can be varied in real time. Due to the
restrictions created by the adder bandwidth and the signal delay due to the amps,
filter, etc. — as can be seen in the block diagram — this circuit is not meant for
applications at high frequencies.
When high frequencies are necessary or when high precisionis required, use the
editor. It can handle simple addition of waveforms.
The AWG2021 has four low-pass filters, 1 MHz, 5 MHz, 20 MHz, and 50 MHz.
They are all Bessel characteristic filters and have soft shoulder characteristics to
Preamplifier (Adder)
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