SBAA686 September   2025 AFE7728D , AFE7768D , AFE7769D

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Enabling Compact and Efficient Multi-band Radios
    1. 2.1 TI RF Transceiver With Integrated CFR/DPD: AFE7769D
    2. 2.2 Skyworks Power Amplifiers
  6. 3Triple-Band CFR/DPD Performance Test Setup and Condition
  7. 4Triple-Band CFR/DPD Performance Test Results
    1. 4.1 TX1 Test Results (Band 41)
    2. 4.2 TX3 Test Results (Band 3)
    3. 4.3 TX4 Test Results (Band 1)
  8. 5Summary

3 Triple-Band CFR/DPD Performance Test Setup and Condition

Figure 3-1 shows the CFR/DPD performance test with AFE7769D in a triple-band setup, where the transmitter channel TX1, TX3 and TX4 are configured to operate at band N41, B3 and B1 with three different Skyworks power amplifiers: SKY66522-11, SKY66391-12 and SKY66394-11, respectively. Note that channel TX2 is also configured to operate at band N41 as TX1, however, for test simplicity, the TX2 output is not connected for further amplification during the CFR/DPD performance test.

Block Diagram of AFE7769D Triple-Band DPD Performance Test Setup Figure 3-1 Block Diagram of AFE7769D Triple-Band DPD Performance Test Setup
Note: The TX RF front-end line-up is via connecting discrete stand-alone evaluation boards and passive components, instead of being soldered down on the same board. Therefore, the results shown in this report are the typical baseline performance with the specific EVM boards and under the specific test conditions as shown in Table 3-1 and Table 3-2. Device-to-device and board-to-board variations are expected. Further DPD performance and PA efficiency optimization is possible through working with TI and Skyworks application teams.

Table 3-1 to Table 3-2 give the test setup (front-end gain, carrier profile) and the final stage power amplifier details.

Table 3-1 Test Setup Details
Parameter TX1 Path TX3 Path TX4 Path
RF center frequency 2595MHz 1842.5MHz 2140MHz
Instantaneous bandwidth (IBW) 200MHz 75MHz 60MHz
Gain of the pre-amplify stage 16dB 19.7dB 19.2dB
Final stage power amplifier used SKY66522-11 SKY66391-12 SKY66394-11
Table 3-2 Power Amplifier Details
Key Attribute SKY66522-11 SKY66391-12 SKY66394-11
Operating frequency range 2300 – 2690MHz 1800 – 1900MHz 2000– 2300MHz
Rated output power 31dBm 28dBm 28dBm
Gain 36.5dB 35.9dB 38dB
Supply voltage 5VDS/12VDS 5VDS 5VDS