ESG Family Signal Generators Front and Rear Panel
Rear Panel Overview
User’s Guide 3-17
18. BASEBAND GEN REF IN Connector
With Option UN8 enabled, the BASEBAND GEN REF IN connector accepts a 0 to
+20 dBm sinewave or TTL squarewave signal from an external 13 MHz timebase
reference. This digital modulation reference clock is used by the internal pattern generator
in GSM applications (only the internal digital data generator can be locked to this external
reference; the RF frequency remains locked to the 10 MHz reference). The nominal input
impedance is 50
Ω
at 13 MHz, AC-coupled.
With Option UND enabled, this connector accepts a TTL or >
−
10 dBm sinewave external
reference at rates from 250 kHz through 20 MHz. The internal clock for the arbitrary
waveform generator is locked to this signal when external reference is selected in the ARB
setup. The minimum pulse width must be > 10 ns. The damage levels are > +8V and <
−
8V.
This female BNC connector is provided only on instruments with Options UND or UN8.
On instruments with Option 1EM, this output is changed from a BNC to an SMB
connector.
19. 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
Ω
,
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
Ω
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 UND only).
This female BNC connector is provided only on instruments with Option UND or UN8. If
you configure your instrument with Option 1EM, this output is relocated from a BNC to an
SMB connector.
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