Keysight M8195A User Manual page 87

Keysight M8195A Revision 2 – Arbitrary Waveform Generator User's Guide
upper limit can be calculated by adding the Nominal "high" value and an
additional headroom resulting from the Ampl(rms) parameter corrected by the
Crest Factor parameter. The lower limit can be symmetrically calculated in a
similar way from the Nominal "low" level (see
Low-Pass Filter Section: Brickwall, and first and second order low-pass filters can be
applied to waveforms, so the effects of discrete components or distributed resistance,
capacitance, and inductance in interconnections can be emulated. DC Gain for all filters
is always 0dB so the amplitude of the reference "high" and "low" levels remain
unchanged (see the Ampl(rms) control description in the Noise Addition Section). The
activation of any Low-Pass Filter and the ISI Filter are mutually exclusive. The following
controls are available:
 Filter Type: This combo box allows for the selection of brickwall, first order and
second order low-pass filters.

Cuttoff Freq.: This is a context sensitive control and it is available only for
Brickwall and First-Order filters (where it refers to the 3dB-attenuation
frequency).
 Ress. Freq.: This is a context sensitive control and it is available only for
Second-Order filters. The resonance frequency of the filter can be set through
this control.

Q: This is a context sensitive control and it is available only for Second-Order
filters. The Quality Factor (or Q Factor) can be set through this control.
ISI Filter Section: The purpose of this filter is the emulation of the effects of some
hardware filters used in combination of traditional pattern generators to cause some
controlled, traceable level of ISI (Inter Symbolic Interference). Gain at DC for all filters is
always 0dB so the amplitude of the reference "high" and "low" levels remain unchanged
(see the Ampl(rms) control description in the Noise Addition Section). The activation of
any Low-Pass Filter and the ISI Filter are mutually exclusive. The following control is
available:

Slope: ISI filter is modeled as a linear attenuation slope, expressed in dB, so it
can be fully defined by setting up the filter's slope and is expressed in dB/GHz
units.
Figure
Figure 22: Clipping and noise amplitude
M8195A User Interface 2
22).
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