GUI reference
R&S
®
ZNA
814User Manual 1178.6462.02 ─ 29
High Level / Low Level
See "High Level / Low Level" on page 811.
Encoder
Enables or disables 8b/10b encoding of the original bit stream.
Remote command:
CALCulate<Chn>:EYE:STIMulus:ENCoder
Scrambler
Enables/disables scrambling of the (encoded) bit stream.
The scrambler is a linear feedback shift register (LFSR) implementing the polynomial
G(X) = X^16+X^5+X^4+X^3+1.
Remote command:
CALCulate<Chn>:EYE:STIMulus:SCRambler
Emphasis
The "Emphasis" dialog allows you to introduce a pre-emphasis filter to the digital signal
simulated for the eye diagram measurement. "Emphasis" and Equalization can be
used to compensate for the signal integrity degradations caused by the DUT.
Access: "Emphasis" button in the Advanced Settings dialog
This dialog is available with Extended time domain analysis option R&S ZNA-K20 only.
In transmission systems known losses of the channel are typically compensated
already in the transmitter. The most common setting is to boost high frequencies com-
pared to low frequencies since the channels show typically larger losses for high fre-
quencies.
This type of equalization is done using finite impulse response (FIR) filters using
between 2 and 4 taps. The filter’s sampling time is identical to bit period.
The coefficients of the FIR filter are not provided directly but in terms of pre- and post-
cursor values. The cursor value is defined as voltage ratio of two adjoining bits. Since
up to four taps can be used, the bit pattern for defining all cursor values must use four
Applic softtool
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