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AD8353 behavior if Vpos=3V and no choke provided

Category: Hardware
Product Number: AD8353

We are taking over a design with several AD8353 devices. These devices are all used with power supplies around 3V i.e between 2.7V and 3.3V. We figured out that the AD8353 devices are used without a choke between the output and the power pins. The engineers who designed this product are not part of the company anymore and are not reachable unfortunately.
We were wondering of the absence of the choke may influence the behavior of the AD8353 when it is powered by a 3V source. Specifically we are interested in the linearity behavior of the amplifier. Does this absence impact the linearity characteristic of the device? Any other impacts may be expected?

  • Hi Nicolas1227,

                               When the supply voltage is 3 V, it is recommended that an external RF choke be connected between the supply voltage  and the output pin, RFOUT. This increases the dc voltage applied to the collector of the output amplifier stage, which improves performance of the AD8353 to be very similar to the performance produced when 5 V


    Jim B