QUALCOMM Apple IF Power Supply IC WTR1625 WTR4905 WTR3925 WTR5975

 QUALCOMM Apple IF Power Supply IC WTR1625 WTR4905 WTR3925 WTR5975

QUALCOMM WTR1625 WTR4905 WTR3925 WTR5975 17+ Suitable for Apple IF power supply IC

Descriptions

WTR3925

There are a few things that are important when talking about a transceiver. To recap, transceivers have a few key elements. On the receive side, we see the need for low noise amplifiers, down-converters, and narrow-band amplifiers. On the transmit side, we need a driver amplifier, up-converter, and another set of narrow-band amplifiers. While most of RF360 is built on relatively old process nodes for CMOS technology, the transceiver can be built on newer CMOS processes because it’s doesn’t have to handle the level of signal that the rest of the front end does.

At a high level, the WTR3925 really brings two new capabilities to the table. First, it does away with the need for a companion transceiver in order to achieve carrier aggregation, which the WTR1625L/WFR1620 combination provided. It seems that this is due to the need for additional ports on the transceiver, which the WTR1625L lacked. The other improvement is that WTR3925 moves to a new 28nm RF process, as opposed to the 65nm RF process used for the WTR1625L.

As a quick aside, RF processes are largely similar to CMOS processes, although with a few modifications. These changes can be thicker metal in interconnects between transistors and memcaps, which are analogous to capacitors in DRAM. Qualcomm claims that this will drive down power consumption, however this is a product of a new architecture that takes advantage of the smaller process node. Unlike digital logic such as what we see on the baseband, RF does not directly benefit from scaling to lower processes. In fact, there is a chance that scaling to lower process nodes can hurt power consumption because even though the transistor can operate faster, there is more noise As a result of this noise, the amplifiers in the transceivers may need more stages and more power in order to achieve the same noise figure.

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