Designing an Amplifier Lineup for SDARS Applications

Guerrilla RF offers a variety of automotive SDARS 2320 to 2345 MHz LNA solutions. Here is a brief overview where we focus on the input SAW filter and stage 1 LNA characteristics.

From an LNA design standpoint, the critical requirements are as follows:

  1. Gain
  2. Noise Figure (NF)
  3. IMRR Rejection
  4. Blocker Rejection

None of the above requirements are difficult to optimize on their own, but simultaneously satisfying items 2, 3 and 4 is quite difficult. The satellite radio LNA specification defines two general classes of LNAs.

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