RF6886 Datasheet, PDF (8/16 Pages) RF Micro Devices – 3.6V, 100MHz TO 1000MHz LINEAR POWER AMPLIFIER

RF6886
Approach 2:
Approach #1 feeds back to variable gain stage behind RF6886. Approach #2 utilizes feedback to V_REG1/2 pins of RF6886.
Recall Log of the Loop Reference Voltage is shown in graphs for both methods. In the circuits shown above, no Log function is
performed. Data for V_delta = (V_PWR_REF - V_PWR_SENSE) vs. Output Power out is collected, and Loop Reference Voltage is
set to V_delta(s) for corresponding Output Power(s). Data can be collected at selected frequency and temperature points,
depending on accuracy desired in a particular application.
Next, a discussion covering RF6886 used in balanced configuration. The application as depicted here:
This configuration can be implemented with readily available surface mount hybrid couplers, and offers significant perfor-
mance and reliability advantages. Use single ended RF6886 3.6V specifications for reference:
1. >38.5dBm output power
2. Linear performance with 2.5dB increase in power for equivalent adjacent channel power specification
3. Immunity to antenna VSWR variation
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