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IMS2022


ARTICLE | AUGUST 9, 2022




POWERING-UP (AND DOWN) GAN POWER AMPLIFIERS WITH POWER MANAGEMENT MODULES

Source: Qorvo

It’s no secret that powering up and down GaN power amplifiers (PAs) in some
designs can be challenging because GaN PAs demand specific bias sequencing. If
it’s not done properly, there’s a risk of component damage. Managing the
sequencing procedure is crucial. The good news: this task just got easier.

Our new video demonstrates how customers using GaN PAs can use the
Qorvo ACT41000 power management module to help efficiently power-up and
power-down those devices. This can help achieve the performance customers are
looking for and simplify the GaN bias procedure.

After setting up the PA using the GUI of the ACT41000, it automatically adjusts
the power-up and power-down sequence of the GaN PA while optimizing the PA
quiescent bias for optimal system performance (see Figure 1). This simplifies
the RF PA system design, making it more cost-effective and easier to use.
Because of the ability to autotune, the ACT41000 removes the need for external
digital-to-analog converters (DAC) and current sense amplifiers. Therefore, your
system is not only easier to design and smaller, but it lowers the overall bill
of material costs by reducing the number of components.


Watch the video to see how customers using GaN PAs can use the Qorvo ACT41000
power management module to help efficiently power-up and power-down those
devices.



Figure 1: Block diagram design of ACT41000 powering the QPA2211.

The ACT41000 comes with an evaluation platform and GUI that offers help in
fine-tuning bias, as shown in Figure 2. The auto-tuning feature also aids in
optimizing bias performance of the GaN PA during equipment aging or temperature
fluctuations. As the GaN PA sees environmental or aging changes, the ACT41000
fine-tunes the device voltage and current values to adjust for optimal
performance settings defined in the GUI. This is very important in applications
like 5G towers where conditions are hot during the day and cooler at night.
Auto-tuning bias helps optimize performance during these fluctuations. This
allows engineers to automate the design, which makes it easier and enables them
to offer their customers more reliable optimized solutions.


Figure 2: GUI used to set up the ACT41000.

The ACT41000 can operate from an input voltage between 4.5 to 40 volts and can
generate a regulated adjustable output voltage up to 34 volts at 4 amps. It can
do this in small steps of 12.5 millivolts. Additionally, it integrates the power
MOSFETs and current DAC, allowing the device to precisely detect the GaN PAs
quiescent drain current. This benefit, along with its built-in configurability,
will enable it to bias a variety of GaN PAs across many markets like satellite
communications, cellular 5G, radar and many more, as shown in Figure 3.


Figure 3: Block diagram of ACT41000 and GaN PA applications that can be applied.

Using power management devices like the ACT41000 for GaN PA biasing can resolve
the diverse challenges of maintaining the performance of your system. To learn
more about how the ACT41000 can be used in GaN PA applications, visit Qorvo’s
short tutorial video.

For more resources focused on tackling complex design challenges, visit
the Qorvo Design Hub for a rich assortment of videos, blog articles, white
papers, tools and more.

 








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