Phase and amplitude controller suits Doherty power amplifiers

4th March 2016
Mick Elliott

Availability of a new monolithic phase and amplitude controller (MPAC) from Peregrine Semiconductor with full design support has been announced by Richardson RFPD. The PE46120 covers a frequency range of 1.8GHz to 2.2GHz and integrates a 90-degree hybrid splitter, digital phase shifters and a digital step attenuator (DSA), along with a low voltage CMOS serial interface.

The new MPAC is designed for precise phase and amplitude control of two independent RF paths, making it ideally suited for Doherty power amplifiers.

It optimises system performance while reducing manufacturing costs of transmitters that use symmetric or asymmetric Doherty PA designs to efficiently process signals with large peak-to-average ratios. 

The device can cover a phase range of 87.2 degrees in 2.8-degree steps and an attenuation range of 7.5dB in 0.5dB steps, while providing excellent phase and amplitude accuracy from 1.8GHz to 2.2GHz.

It also features exceptional linearity, high output port-to-port isolation and extremely low power consumption relative to competing module solutions. It is offered in a 32-lead 6 mm x 6 mm QFN package. 

The PE46120 is manufactured on Peregrine’s UltraCMOS process, a patented variation of silicon-on-insulator (SOI) technology on a sapphire substrate, offering the performance of GaAs with the economy and integration of conventional CMOS. Peregrine’s HaRP technology enhancements deliver high linearity and excellent harmonics performance.

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