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DPD/PA TEST REPORT AD9375, SKY66391-12
Rev. Sp0 | Page 1 of 12
DPD/PA TEST REPORT
RF Transceiver AD9375
Power Amplifier SKY66391-12
PA Type High Efficiency Semi-Linear PA
Transistor Type SWKS HBT
Operating Frequency Range (MHz) 1800 – 1900
Gain (dB) 36
Power Added Efficiency 35% @ +28 dBm
OP3dB (dBm) +36
Supply Voltage +5 V
Bandwidths Tested 40 MHz & 60 MHz
AD9375, SKY66391-12 DPD/PA TEST REPORT
Rev.Sp0 | Page 2 of 12
SUMMARY
Frequency Output Power
(dBm rms)
Signal Bandwidth Test Signal ACLR +1
(dBc) ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
Power Added
Efficiency (%)
1820 MHz (Bottom) +28 40 MHz
ETM3.1 20 MHz LTE 2 Carrier
-50.8 -51.1 -55.2 -55.5 36.3
1850 MHz (Middle)
+28 40 MHz ETM3.1 20 MHz LTE 2 Carrier
-54.0 -54.3 -57.8 -58.6 36.4
1880 MHz (Top)
+28 40 MHz ETM3.1 20 MHz LTE 2 Carrier
-54.2 -53.6 -55.8 -56.9 35.0
1820 MHz (Bottom) +28 60 MHz*
ETM3.1 20 MHz LTE 3 Carrier
-50.0 -50.3 -53.5 -51.6 36.5
1850 MHz (Middle)
+28.1 60 MHz* ETM3.1 20 MHz LTE 3 Carrier
-50.1 -49.9 -52.2 -52.2 36.3
1880 MHz (Top)
+28 60 MHz* ETM3.1 20 MHz LTE 3 Carrier
-50.6 -51.1 -51.2 -53.6 35.2
*ADI only support AD9375 DPD for up to 40MHz linearization bandwidth.
BLOCK DIAGRAM
SKY66391-12 TX
ORX
DPD/PA TEST REPORT AD9375, SKY66391-12
Rev. Sp0 | Page 3 of 12
ACLR RESULTS BOTTOM/MIDDLE/TOP FREQUENCIES 1820 MHZ, 40 MHZ BANDWIDTH ACLR RESULTS
Figure 1. SKY66391-12 @ 1820 MHz, 20 MHz ETM3.1 signal 2 Carrier before/after DPD
Before/After DPD
Output Power (rms)
ACLR+1 (dBc)
ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
ACLR+3 (dBc)
ACLR-3 (dBc)
Drain Current
(mA)
PAE (%)
Before DPD +28.2 -37.8 -33.1 -42.2 -37.2 -51.4 -45.0 356 37.1
After DPD +28.0 -50.8 -51.1 -55.2 -55.5 -57.6 -57.5 348 36.3
Table 1. Summary of Results: Frequency: 1820 MHz, 20 MHZ ETM3.1 Signal 2 Carrier
PA settings: Vcc1 = Vcc2 = Vcc3 = VBias = 5.0 V, Ven = 2.0 V Signal Used : ETM3.1 AD9375 DPD configuration
AD9375, SKY66391-12 DPD/PA TEST REPORT
Rev.Sp0 | Page 4 of 12
1850 MHZ, 40 MHZ BANDWIDTH ACLR RESULTS
Figure 2. SKY66391-12 @ 1850 MHz, 20 MHz ETM3.1 signal 2 Carrier before/after DPD
Before/After DPD
Output Power (rms)
ACLR+1 (dBc)
ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
ACLR+3 (dBc)
ACLR-3 (dBc)
Drain Current
(mA)
PAE (%)
Before DPD +28.2 -37.0 -32.2 -41.8 -36.6 -52.1 -45.1 357 37.0
After DPD +28.0 -54.0 -54.3 -57.8 -58.6 -58.3 -59.5 347 36.4
Table 2. Summary of Results: Frequency: 1850 MHz, 20 MHZ ETM3.1 Signal 2 Carrier
PA settings: Vcc1 = Vcc2 = Vcc3 = VBias = 5.0 V, Ven = 2.0 V Signal Used: ETM3.1 AD9375 DPD configuration
DPD/PA TEST REPORT AD9375, SKY66391-12
Rev. Sp0 | Page 5 of 12
1880 MHZ, 40 MHZ BANDWIDTH ACLR RESULTS
Figure 3. SKY66391-12 @ 1880 MHz, 20 MHz ETM3.1 signal 2 Carrier before/after DPD
Before/After DPD
Output Power (rms)
ACLR+1 (dBc)
ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
ACLR+3 (dBc)
ACLR-3 (dBc)
Drain Current
(mA)
PAE (%)
Before DPD +28.2 -32.7 -30.5 -37.6 -35.6 -45.8 -44.3 368 35.9
After DPD +28.0 -54.2 -53.6 -55.8 -56.9 -57.8 -58.5 361 35.0
Table 3. Summary of Results: Frequency: 1880 MHz, 20 MHZ ETM3.1 Signal 2 Carrier
PA settings: Vcc1 = Vcc2 = Vcc3 = VBias = 5.0 V, Ven = 2.0 V Signal Used : ETM3.1 AD9375 DPD configuration
AD9375, SKY66391-12 DPD/PA TEST REPORT
Rev.Sp0 | Page 6 of 12
ACLR RESULTS BOTTOM/MIDDLE/TOP FREQUENCIES 1830 MHZ, 60 MHZ BANDWIDTH ACLR RESULTS
Figure 4. SKY66391-12 @ 1830 MHz, 20 MHz ETM3.1 signal 3 Carrier before/after DPD
Before/After DPD
Output Power (rms)
ACLR+1 (dBc)
ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
ACLR+3 (dBc)
ACLR-3 (dBc)
Drain Current
(mA)
PAE (%)
Before DPD +28.2 -34.7 -30.1 -35.6 -30.8 -41.2 -35.6 353 37.4
After DPD +28.0 -50.0 -50.3 -53.5 -51.6 -53.0 -51.1 346 36.5
Table 4. Summary of Results: Frequency: 1830 MHz, 20 MHZ ETM3.1 Signal 3 Carrier
PA settings: Vcc1 = Vcc2 = Vcc3 = VBias = 5.0 V, Ven = 2.0 V Signal Used : ETM3.1 AD9375 DPD configuration
DPD/PA TEST REPORT AD9375, SKY66391-12
Rev. Sp0 | Page 7 of 12
1850 MHZ, 60 MHZ BANDWIDTH ACLR RESULTS
Figure 5. SKY66391-12 @ 1850 MHz, 20 MHz ETM3.1 signal 3 Carrier before/after DPD
Before/After DPD
Output Power (rms)
ACLR+1 (dBc)
ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
ACLR+3 (dBc)
ACLR-3 (dBc)
Drain Current
(mA)
PAE (%)
Before DPD +28.3 -34.0 -29.5 -34.8 -30.3 -39.9 -35.1 364 37.1
After DPD +28.1 -50.1 -49.9 -52.2 -52.2 -52.3 -51.7 356 36.3
Table 5. Summary of Results: Frequency: 1850 MHz, 20 MHZ ETM3.1 Signal 3 Carrier
PA settings: Vcc1 = Vcc2 = Vcc3 = VBias = 5.0 V, Ven = 2.0 V Signal Used: ETM3.1 AD9375 DPD configuration
AD9375, SKY66391-12 DPD/PA TEST REPORT
Rev.Sp0 | Page 8 of 12
1870 MHZ, 60 MHZ BANDWIDTH ACLR RESULTS
Figure 6. SKY66391-12 @ 1870 MHz, 20 MHz ETM3.1 signal 3 Carrier before/after DPD
Before/After DPD
Output Power (rms)
ACLR+1 (dBc)
ACLR-1 (dBc)
ACLR+2 (dBc)
ACLR-2 (dBc)
ACLR+3 (dBc)
ACLR-3 (dBc)
Drain Current
(mA)
PAE (%)
Before DPD +28.2 -32.0 -28.8 -32.8 -30.0 -37.4 -34.7 369 35.8
After DPD +28.0 -50.6 -51.1 -51.2 -53.6 -51.2 -52.6 358 35.2
Table 6. Summary of Results: Frequency: 1870 MHz, 20 MHZ ETM3.1 Signal 3 Carrier
PA settings: Vcc1 = Vcc2 = Vcc3 = VBias = 5.0 V, Ven = 2.0 V Signal Used : ETM3.1 AD9375 DPD configuration
DPD/PA TEST REPORT AD9375, SKY66391-12
Rev. Sp0 | Page 9 of 12
WIDEBAND PLOTS, BOTTOM/MIDDLE/TOP FREQUENCIES
Figure 7. Wideband Spectrum Analyzer Plot: Frequency 1820 MHZ, 20 MHz ETM3.1 Signal 2 Carrier
Figure 8. Wideband Spectrum Analyzer Plot: Frequency 1850 MHZ, 20 MHz ETM3.1 Signal 2 Carrier
Figure 9. Wideband Spectrum Analyzer Plot: Frequency 1880 MHZ, 20 MHz ETM3.1 Signal 2 Carrier
AD9375, SKY66391-12 DPD/PA TEST REPORT
Rev.Sp0 | Page 10 of 12
Figure 10. Wideband Spectrum Analyzer Plot: Frequency 1830 MHZ, 20 MHz ETM3.1 Signal 3 Carrier
Figure 11. Wideband Spectrum Analyzer Plot: Frequency 1850 MHZ, 20 MHz ETM3.1 Signal 3 Carrier
Figure 12. Wideband Spectrum Analyzer Plot: Frequency 1870 MHZ, 20 MHz ETM3.1 Signal 3 Carrier
DPD/PA TEST REPORT AD9375, SKY66391-12
Rev. Sp0 | Page 11 of 12
ACLR VS POUT
Figure 13. ACLR vs Output Power (Frequency 1850 MHZ, 20 MHz ETM3.1 Signal 2 Carrier)
Figure 14. ACLR vs Output Power (Frequency 1850 MHZ, 20 MHz ETM3.1 Signal 3 Carrier)
-65
-63
-61
-59
-57
-55
-53
-51
23 24 25 26 27 28
ACLR
(dBc
)
Pout (dBm)
SKY66391-12: ACLR vs Pout (40MHz BW)
ACLR-1
ACLR+1
ACLR-2
ACLR+2
-60-59-58-57-56-55-54-53-52-51-50
23 24 25 26 27 28
ACLR
(dBc
)
Pout (dBm)
SKY66391-12: ACLR vs Pout (60MHz BW)
ACLR-1
ACLR+1
ACLR-2
ACLR+2
AD9375, SKY66391-12 DPD/PA TEST REPORT
Rev.Sp0 | Page 12 of 12
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