Agilent Technologies ESG Betriebsanweisung Seite 36

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Seitenansicht 35
20 Chapter 1
Signal Generator Overview
Rear Panel Overview
3. BER CLK IN Connector (Option UN7 only)
Use this connector to input the clock signal for the bit-error-rate measurements. The rising
(positive) or falling (negative) edge of the signal (selected either by softkey or SCPI command)
causes data on the BER DATA IN connector to be sampled. The damage levels are > +8 and
<
4 V. This connector must be terminated with a TTL-compatible high impedance or 75
load.
4. BER DATA IN Connector (Option UN7 only)
Use this connector to input the data streams for the bit-error-rate measurements. The rising
(positive) or falling (negative) edge of the BER CLK IN signal (selected by the softkey or the
SCPI command) is used to trigger the reading of the data. The damage levels are > +8 and
<
4 V. This connector must be terminated with a TTL-compatible high impedance or 75
load.
5. I-bar OUT Connector
I-bar is used in conjunction with I to provide a balanced baseband stimulus. Balanced signals
are signals present in two separate conductors that are symmetrical relative to ground, and
are opposite in polarity (180 degrees out of phase). The nominal output impedance of this
connector is 50
, DC-coupled. The damage levels are > +2 V and < 2 V. The DC origin offset
is typically < 10 mV. The output signal levels into a 50
load are as follows:
0.5 V
pk
, typical, corresponds to one unit length of the I/Q vector.
•0.69 V
pk
(2.84 dB), typical, maximum crest factor for peaks for π/4 DQPSK with
alpha = 0.5.
•0.71 V
pk
(3.08 dB), typical, maximum crest factor for peaks for π/4 DQPSK with
alpha = 0.35.
Typically 1 V
p-p
maximum (Option 001 or 002 only).
This female BNC connector is provided only on signal generators with Option 001 or 002. If
you configure your signal generator with Option 1EM, this output is relocated from a BNC to
an SMB connector.
6. I OUT Connector
The I OUT connector outputs the analog, in-phase component of I/Q modulation from the
internal baseband generator. The nominal output impedance of this connector is 50
,
DC-coupled. The damage levels are > +2 V and <
2 V. The DC origin offset is typically
< 10 mV. The output signal levels into a 50
load are as follows:
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