CN-0248 Datasheet, PDF (6/6 Pages) Analog Devices – An IQ Demodulator-Based IF-to-Baseband Receiver with IF and Baseband Variable Gain and Programmable Baseband Filtering

CN-0248
The signal metrics on the vector signal generator must match
the metrics on the VSA software. When the software starts up, it
should display the IQ Constellation pane and the Spectrum
pane. Add the information window on the VSA software by
taking the following steps:
1. Click Display
2. Click Layout
3. Select Grid 2×2
By default, the other two panes that have appeared should be an
Error Vector vs. Time and the information window, Syms/Errs. If
this is not the case, do the following:
1. Double-click the title of any pane
2. Select Syms/Errs in the window that appears
The Syms/Errs pane presents a number of results, including
EVM. The software should be locked onto the signal and
reporting an EVM number.
The AGC setpoint, maximum gain, and filter bandwidth can all
be set with the respective control software of the individual devices.
Power control at the input of the ADL5336 can be done via a
power sweep on the vector signal analyzer. A −80 dBm to almost
+16 dBm sweep was performed to test the receiver in this test
setup. The gain on the ADRF6510 was always set to achieve a
1.5 V p-p differential output level, assuming there was sufficient
gain to achieve this. In some cases, for very small signal levels, the
ADRF6510 did not have enough gain to reach the 1.5 V p-p
differential level.
Circuit Note
LEARN MORE
CN-0248 Design Support Package:
http://www.analog.com/CN0248-DesignSupport
Ardizzoni, John. A Practical Guide to High-Speed Printed-
Circuit-Board Layout, Analog Dialogue 39-09, September 2005.
MT-031 Tutorial, Grounding Data Converters and Solving the
Mystery of "AGND" and "DGND." Analog Devices.
MT-073 Tutorial, High Speed Variable Gain Amplifiers (VGAs).
Analog Devices.
MT-101 Tutorial, Decoupling Techniques, Analog Devices.
ADIsimPLL Design Tool
ADIsimRF Design Tool
AN-0996 Application Note. The Advantages of Using a
Quadrature Digital Upconverter (QDUC) in Point-to-Point
Microwave Transmit Systems. Analog Devices.
AN-1039 Application Note. Correcting Imperfections in IQ
Modulators to Improve RF Signal Fidelity. Analog Devices.
CN-0134 Circuit Note, Broadband Low Error Vector Magnitude
(EVM) Direct Conversion Transmitter, Analog Devices
Data Sheets and Evaluation Boards
ADRF6510 Data Sheet and Evaluation Board
ADL5387 Data Sheet and Evaluation Board
ADL5336 Data Sheet and Evaluation Board
ADF4350 Data Sheet and Evaluation Board
AD9248 Data Sheet and Evaluation Board
ADRF6516 Data Sheet and Evaluation Board
AD8130 Data Sheet and Evaluation Board
REVISION HISTORY
4/12—Revision 0: Initial Version
(Continued from first page) Circuits from the Lab circuits are intended only for use with Analog Devices products and are the intellectual property of Analog Devices or its licensors. While you
may use the Circuits from the Lab circuits in the design of your product, no other license is granted by implication or otherwise under any patents or other intellectual property by
application or use of the Circuits from the Lab circuits. Information furnished by Analog Devices is believed to be accurate and reliable. However, Circuits from the Lab circuits are supplied
"as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability, noninfringement or fitness for a particular
purpose and no responsibility is assumed by Analog Devices for their use, nor for any infringements of patents or other rights of third parties that may result from their use. Analog Devices
reserves the right to change any Circuits from the Lab circuits at any time without notice but is under no obligation to do so.
©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
CN10285-0-4/12(0)
Rev. 0 | Page 6 of 6