Atec Anritsu-MG3670 Series - Manual (Page 2)

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RADIO COMMUNICATIONS, EMI MEASURING TEST INSTRUMENTS
6
Basic performance
•
I/Q input supporting wide range of applications (only for
MG3672A)
The MG3672A is equipped with wide-band I/Q input from DC to 30
MHz (3 dB) so that wide-band quadrature modulation can be per-
formed. This ensures that the MG3672A will remain fully compatible
with communication systems for which band expansion is planned in
the future.
Output level frequency characteristics
(50 Ω/0.5 Vrms mode)
30 k 100 k 300 k 1 M 10 M 3 M
0
–1
–2
–3
Level (dB)
I/Q signal input frequency (Hz)
Frequency response for I/Q external modulation (typical values)
•
I/Q signal I/O over broad frequency range (only for MG3670B/C,
MG3671A/B)
A quadrature modulator is built in, and external I/Q signals can be in-
put to enable use with a variety of digital modulation modes, includ-
ing QPSK, 8PSK, and M16QAM. The modulation band for I/Q input
signals is broad, covering the CDMA spread spectrum bandwidth.
Further, by adding an expansion unit, I/Q signal output can be ob-
tained from the internal data generator. Either 50 Ω or CMOS-level
compatibility can be selected for I/Q signals. Functions for adjusting
the level balance, offset, and phase are also provided for greater util-
ity in evaluating modulators/demodulators and other devices.
Frequency response for I/Q external modulation (typical values)
•
Excellent spectral purity
The SSB phase noise characteristic is an excellent –120 dBc/Hz or
less (100 kHz offset). The adjacent channel power characteristic ex-
cels as the interference signal source during modulation.
Output level accuracy at 1.9 GHz
•
High modulation accuracy
A vector error of less than 1.8%rms is assured for output levels up to
+5 dBm over the entire operating frequency range. This high modu-
lation accuracy is also achieved when the expansion units are used.
Even when the MG0301C and MG0303B units are installed and
π/4
DQPSK modulation burst signals are generated, the vector error is
less than 1.8%rms. The MG3670B/C, MG3671A/B and MG3672A
enable measurement and quality evaluation of receivers and other
devices with more than adequate precision.
SSB phase noise at 1.9 GHz
•
Large output level
Through use of new AGC circuitry, the MG3670B/C, MG3671A/B,
and MG3672A produce a highly precise output at levels down to
–143 dBm with stable frequency characteristics, not only for output
of unmodulated signals but also with
π/4 DQPSK modulation accom-
panied by amplitude fluctuations and when outputting burst signals.
The MG3670B/C, MG3671A/B and MG3672A can generate a high
output level of up to +13 dBm over a broad range of frequencies, so
amplifiers are not needed even when testing receivers for excess
input and in testing other devices.