• The signals amplified by the carrier and peaking sub-amplifiers must be aligned
in amplitude and phase for maximum Doherty performance
• Independent variation in the sub-amplifiers, present in particular in asymmetric
Doherty PAs, leads to amplitude and phase imbalance, which results in
:
–
Degraded DPD performance
–
Reduced efficiency
–
Low PA production yield
• Phase and amplitude control of the incident signals enables significant
performance improvement of the entire PA production population
TM
2
Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other product or service names are the property of
Manufactured in cost-effective industry standard QFN 32-pin 6 mm
surface mount plastic package
Built in SPI digital control of amplitude and phase
Excellent amplitude and phase performance over temperature
•
Digital adjustment precision and excellent repeatability
TM
3
Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other product or service names are the property of
• PA design with smaller production margins; smaller transistors
can be used and hence system efficiency is increased
• Enables consistent asymmetric Doherty PAs
• Enables Doherty bandwidth improvement
• Real-time field adjustment possible to optimize PA
performance under different conditions (power backoff,
supply voltage, temperature, etc.)
• Provides adjustment precision and repeatability
TM
4
Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other product or service names are the property of
Freescale and the Freescale logo are trademarks of Freescale Semiconductor, Inc., Reg. U.S. Pat. & Tm. Off. All other product or service names are the property of
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