March 11, 2016
Multiplexer solutions help simplify and accelerate adoption of carrier aggregation (CA) in 4G LTE devices. These compact multiplexer devices deliver up to 60% space savings and cover primary band combinations such as Bands 1 and 3 used in CA deployments.
A multiplexer is a device that separates signals from a common input to multiple outputs, sorting the output ports according to specific band frequencies. As shown in Figure 1 below, a multiplexer takes the place of two duplexers, reducing size and complexity for the system engineer. However, this introduces challenges for the multiplexer designer. The multiplexer designer must painstakingly match individual band duplexer filters, meeting stringent specifications for isolation, cross isolation, attenuation and insertion loss.
Multiplexers used in RF front-end architectures enable CA, which helps increase data speeds for mobile device networks. They also simplify the design for engineers. Some architectures using multiplexers require no switch (right side of Figure 2) rather than a duplexer design using two single-throw switches (left side of Figure 2).
The switch-multiplexer combination also gives the following benefits over the switch-duplexer approach:
In short, multiplexer solutions simplify design, reduce product footprint, conserve power and improve overall system performance. This gives mobile device design engineers the ability to offer customers a unique product in addition to accelerating their delivery of next-generation products.
Qorvo multiplexers meet global regional device requirements integrating multiple SAW and BAW filters. They additionally cover the primary band combinations used in CA deployments, such as Bands 1+3 and Bands 39+41.
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