Analog Devices UG-016 User Manual page 10

UG-016
Figure 17. SPI Controller, MODES(8) Box
5. In the Chan X tab of the SPI Controller, where X is the
channel to which an analog input is applied, find the
CW_IQ_DEMOD_PH(2D) box. Select the CW Channel
Enabl check box to enable the channel. Then select the
phase rotation of the channel using the I/Q Demoduator
Phase drop-down menu.
Figure 18. SPI Controller, CW_IQ_DEMOD_PH(2D) Box
6. An example of the CW Doppler output, as shown in Figure 19
and Figure 20, can be seen in the frequency and time domain,
respectively. Make sure to set the analog input level appro-
priately to achieve full scale throughout the signal chain.
REF Lv1
0dBm
0
–10
–20
–30
1AVG
–40
–50
–60
–70
–80
–90
–100
–110
–120
START 20Hz
Figure 19. Typical Spectrum Analyzer Display of CWD Output
TEK RUN: 2.50MS/s
T
3
CH3 100mVΩ
Figure 20. Typical Oscilloscope Display of CWD Output
Rev. 0 | Page 10 of 28
Evaluation Board User Guide
MARKER 1 [T1] RBW 100Hz
–1.91dBm VBW 100Hz
13.38605210kHz SWT 12.5s
1
2.498kHz
SAMPLE
[ ]
T
M20.0µs CH3
RF ATT 30dB
UNIT dBm
A
1SA
STOP 25kHz
C3 FREQ
12.330kHz
UNSTABLE
HISTOGRAM
C3 p-p
576mV
8mV