A High Performance, Single-SAW SDARS Solution
Introducing Guerrilla RF’s new Satellite Digital Audio Radio Service (SDARS) solution for non-collocated cellular transmit applications. In this operating environment, the difficult out-of-band blocker (OOB) specification is reduced significantly from +10 dBm to –10 dBm. This relaxation of the OOB blocker spec makes it possible to have a spec-compliant LNA solution which uses only a single surface acoustic wave (SAW) filter. The primary driver behind this architecture is the cost savings that can be realized from omitting the SAW filter prior to the stage 1 LNA.
Due to the Wireless Communication Service (WCS) requirements in the SXM specification, a high-rejection, high-insertion loss WCS SAW filter is required to be spec-compliant. As shown below in our reference design board, our solution uses a B3447 SAW device from RF360 with GRF2071 chosen as the stage 1 LNA and GRF2073 as the stage 2 LNA.
The GRF2071 stage 1 LNA is the heart of the architecture as it must:
Pass the IMRR2, IMRR3 and OOB linearity requirements without an input SAW
filter protecting it.
reference design data report as well as a reference design evaluation board
are available from Guerrilla RF. We also have outstanding SDARS reference
design solutions for applications with a co-located cellular transmitter
which are based on a dual-SAW design, and those are available for sampling as