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Chapter 5. Memoryless Nonlinearity and D... > 5.2. Signal Desensitization and Bloc...

5.2. Signal Desensitization and Blocking

When a weak desired signal is present along with a strong dominant interferer, the latter, due to the compressive behavior of the circuit, tends to reduce its overall average gain, thus serving to further weaken the desired signal. This process is known as desensitization. To illustrate this effect, consider the two-tone scenario described above where the desired tone at ω1 and the interfering tone is at ω2. The output at the desired frequency can be written as:(5.16)

As the interfering tone level gets larger in comparison to the desired tone level, the output at the desired signal becomes:(5.17)

As discussed earlier, for compressive behavior where β3<0, the gain expression in (5.17) diminishes as the magnitude of the interfering tone α2 increases. As the desired signal gain approaches zero, the signal is said to be blocked, and the interferer is often referred to as a blocker. Signal desensitization will be further addressed in Section 5.5.


  

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