News — 315 MHz

  There is a fundamental tension at the heart of every RF receiver front end. The trade-off between selectivity and sensitivity sounds abstract, but it shows up in entirely practical ways the moment you start specifying a bandpass filter. What the Terms Mean Selectivity is the receiver's ability to discriminate between a wanted signal and an unwanted one at a nearby frequency. A highly selective receiver — one with a very narrow bandpass filter ahead of its LNA — rejects out-of-band interference before it can cause problems downstream. Sensitivity is the receiver's ability to detect weak signals, limited primarily by...