Full wave rectifier pdf

  1. 7.2: Precision Rectifiers


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7.2: Precision Rectifiers

\( \newcommand\): Rectifier with gain. Computer Simulation A Multisim simulation of the circuit shown in Figure \(\PageIndex\): Output waveforms of precision rectifier. 7.2.1: Peak Detector One variation on the basic half-wave rectifier is the peak detector. This circuit will produce an output that is equal to the peak value of the input signal. This can be configured for either positive or negative peaks. The output of a peak detector can be used for instrumentation or measurement applications. It can also be thought of as an analog pulse stretcher. A simple positive peak detector is shown in Figure \(\PageIndex = 2.5 mV/\mu s \nonumber \] This is a very slow slew rate! If FET input devices are used, the effective discharge resistance can be very high, thus lowering the requirement for \(C\). For typical applications, \(C\) would be many times smaller than the value used here. For long discharge times, high quality capacitors must be used, as their internal leakage will place the upper limit on discharge resistance. Example \(\PageIndex\). 7.2.2: Precision Full-Wave Rectifier A full-wave rectifier has the input/output characteristic shown in Figure \(\PageIndex\): Power amplifier overload detector.