Question 3.32: A radio frequency signal received and amplified by a cellpho......
A radio frequency signal received and amplified by a cellphone exhibits a peak swing of 10 mV. We wish to generate a dc voltage representing the signal amplitude [Eq. (3.8)]. Is it possible to use the half-wave or full-wave rectifiers studied above?
V_{out , avg}={\frac{V_{p}}{\pi }}. (3.8)
Step-by-Step
No, it is not. Owing to its small amplitude, the signal cannot turn actual diodes on and off, resulting in a zero output. For such signal levels, “precision rectification” is necessary, a subject studied in Chapter 8.
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