25 November 2015
Telecoms, Datacoms, Wireless, IoT
Peregrine Semiconductor premiered a brand new line of UltraCMOS monolithic phase and amplitude controllers (MPAC), the industry’s first monolithic RF solution to maximise Doherty amplifier performance. Through a digital interface, MPAC enables alignment of the phase and amplitude between the Doherty amplifier’s carrier and peaking paths. Designed for wireless infrastructure applications, MPAC improves system performance, lowers costs, increases reliability and provides maximum tuning flexibility.
While widely used in the wireless infrastructure industry, Doherty amplifiers require a considerable engineering investment to manually implement and optimise. Any mismatch or misalignment in phase and amplitude between the Doherty architecture’s carrier and peaking paths can quickly contribute to higher costs and degradation of the system’s overall performance. Even after optimising with discrete components, the system remains inflexible to manufacturing variances from power amplifier assemblies.
MPAC solves this engineering challenge with the industry’s first monolithic solution to maximise asymmetric and symmetric Doherty amplifier performance. On an UltraCMOS chip, each MPAC product includes a 90-degree hybrid splitter, two phase shifters, two amplitude controllers and a digital SPI interface.
With a wide positive and negative phase shift range and a fine step size, MPAC delivers high linearity of 65 dBm IIP3 and extremely low power consumption of 300 µA. It provides performance advantages in power handling and port-to-port isolation. UltraCMOS technology enables superior ESD performance of 1 kV, an extended temperature range up to 105°C and a wide power supply range from 2,7 to 5,5 V.
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