Small Cell BTS
Designers of Small Cell Base Transceiver Station (BTS) systems face many technical challenges when specifying and designing the RF front-end. In many ways, those challenges are similar to the ones faced by designers of mobile handsets. There are issues with size, power consumption, power added efficiency (PAE), receiver sensitivity, frequency band coverage, coexistence with other radios, and hardware design and layout flexibility. Broadcom has addressed these concerns with a broad portfolio of RF product solutions including power amplifiers (PAs), low noise amplifiers (LNAs), FBAR filters and duplexers, and integrated GPS/GNSS LNA filter modules for small cell BTS applications.
Broadcom RF Front-End Solutions Enable Next Generation Small Cells
- Comprehensive portfolio of Small Cell RF front end solutions
- Best-in-class PA featuring unmatched linearity, gain and power efficiency with integrated power detector and shutdown function
- Ultra low NF LNA greatly enhancing Small Cell receiver sensitivity
- Innovative FBAR filter enabling stringent adjacent multi-band operation without performance degradation due to interference
- Common component footprint and application circuitry across different frequency bands simplifying platform-based hardware design
- Integrated modules reducing parts count, board space, design time and BOM cost
Enabling LTE and WiFi Coexistence in Small Cells
With FBAR, Broadcom is enabling multi-band multi-standard radios in Small Cell BTS. Radios that operate over multiple bands, in multiple regions of the world, and with simultaneous LTE voice and data are made possible with Broadcom’s FBAR technology. 4G/LTE frequency bands are often co-located next to other frequency bands - sometimes with little to no guard band separating adjacent bands. With steep filter skirts and superior out of band rejection, FBAR allows today’s Small Cells to co-exist in the presence of frequencies that would otherwise interfere with normal operation.
For example, mobile data bandwidth offload via WiFi connectivity is an important way mobile operators can increase network capacity and coverage. However, integrating certain LTE radios into a Small Cell system can pose challenging coexistence problems affecting the 2.4GHz WiFi operation. There are minimal guard bands between the LTE Band 40 and WiFi and between the WiFi and LTE Band 41 or Band 7 Transmit. Without superior filtering, WiFi signals could be blocked by strong adjacent LTE signals.