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Where To Find This Example

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Design Notes

802.11a/b Power Amplifier (PA) Test Bench

This example can be used to test a PA's adjacent channel power ratio (ACPR) and error vector magnitude (EVM) performance.

In each system diagram a text data file is used to import the AM/AM and AM/PM characteristics of the amplifier under test.

There are individual system diagrams for ACPR and EVM measurements.

In the ACPR system diagrams the following graphs are displayed:

1. The amplified signal spectrum versus the spectral mask.

2. A graph that displays:

a. The instantaneous signal power versus the AM/AM curve of the amplifier under test.

b. The instantaneous phase content of the signal versus the AM/PM curve of the amplifier under test.

3. ACPR versus swept output power for particular offset values.

Other ACPR measurements can be viewed by selecting any of the remaining ACPR graphs in the project tree.

In the EVM system diagrams you will see a reference IQ plot versus the measured IQ plot. The EVM measurements are displayed in a table format and are in dB. The EVM measurements are made at one power level. Swept EVM measurements are supported by the EVM_PS measurement.

Please read the online help for information on any of the blocks that are used in the system diagrams. In addition, please read the online help for ACPR and EVM measurements.

System Diagram - 802_11b For EVM

System Diagram - 802_11a For EVM

System Diagram - 802_11b For ACPR

System Diagram - 802_11a For ACPR

Graph - 80211A EVM

EVM(VSA.M2,1,1,1,520,1,0,10,0,1,1,1,0,0,0,0,0) (ns) 802_11a For EVM Time EVM(VSA.M2,1,1,1,520,1,0,10,0,1,1,1,0,0,0,0,0) 802_11a For EVM
1.6657e+08 1.91069

Graph - 80211B EVM

EVM(VSA.M1,1,1,1,1000,1,1,2,0,1,1,2000,0,0,0,0,0) (ns) 802_11b For EVM Time EVM(VSA.M1,1,1,1,1000,1,1,2,0,1,1,2000,0,0,0,0,0) 802_11b For EVM
740273 5.78432
831182 5.8286
922091 5.8286

Graph - 80211B Pout vs Pin at fc 2437MHz and 20MHz BW

DB(AMtoAM_PS(VSA.M2,2437,3,20,3,2437,3,20,3,0,1000,0,10,0,-1,0,-1,0,0.5,0,1,0)) (dBm) 802_11b For ACPR x Values DB(AMtoAM_PS(VSA.M2,2437,3,20,3,2437,3,20,3,0,1000,0,10,0,-1,0,-1,0,0.5,0,1,0)) (dBm) 802_11b For ACPR
-5.00003 3.16548
-4.00003 4.10212
-3.00003 5.03227
-2.00003 5.95782
-1.00003 6.88185
-3.02774e-05 7.80882
0.99997 8.7437
1.99997 9.69131
2.99997 10.6537
3.99997 11.6291
4.99997 12.6068
5.99997 13.5505
6.99997 14.4217
7.99997 15.2032
8.99997 15.8865
9.99997 16.4645