Fast rectifier circumvents input-level effects
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All diode-based rectifier circuits suffer from a signal-level-dependent frequency response. This response occurs because the dynamic impedance of the diodes varies as the signal level changes. The result is a slower frequency response and distorted rectified outputs at low signal levels compared with high levels.
Read More Source : http://www.edn.com/archives/1994/122294/26di5.htm
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