2-7
IM 703155-01E
Functional Description
2
2.4
Generation/Output Conditions
10-MHz Reference Signal «For procedures, see section 5.1»
The VB8300 generates waveforms by synchronizing to the internal or external clock
signal. The internal clock signal is generated based on the 10-MHz reference signal.
You can select whether to use the internal signal or a signal applied externally for the 10-
MHz reference signal.
Clock Signal «For procedures, see section 5.2»
You can select whether to synchronize to the clock signal generated internally or an
external clock signal to generate waveforms.
Clock Frequency «For procedures, see section 5.3»
The VB8300 generates waveforms by synchronizing to the internal or external clock
signal. Of the two clock signals, you can set the frequency of the internal clock signal
(the clock frequency). For example, if you specify a clock frequency of 100 MHz on a
sine wave that contains 100 points for a single period, a sine waveform with a frequency
of 1 MHz is output.
If you select external clock, the VB8300 generates waveforms by synchronizing to the
external clock signal frequency.
Gain «For procedures, see section 5.4»
For each output terminal set (OUT), you can set the output waveform amplitude. In
addition, the RMS and peak values corresponding to the specified gain value are
assigned. If phase, IQ gain ratio, and quadrature offset are not specified, 2 Vp-p is set to
0 dB. You can change the gain even while the waveform is being output.
Q
I
Phase «For procedures, see section 5.4»
For each output terminal set (OUT), you can set the rotation angle (amount of phase shift)
on the IQ plane of the output waveform. You can use this to evaluate transmission
diversity, for example. You can change the phase even while the waveform is being output.
Transmission Diversity Evaluation Example
By setting phases to OUT1 and OUT2, you can simulate the phase difference between
antenna 1 and 2.
VB8300
Receiver
OUT 1 I
OUT 1 Q
OUT 2 I
OUT 2 Q
Tx
Tx
Rx
Rx
Up Convert
Down Convert
Antenna 1
Antenna 2
Q
I
OUT 1
Q
I
OUT 2
