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Title : MT-078: High Frequency Log Amps
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Date : 25-Mar-2009
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In Tutorial MT-077 we discussed low frequency log amps. In this tutorial we discuss high frequency applications. The classic diode/op amp (or transistor/op amp) log amp suffers from limited frequency response, especially at low levels. For high frequency applications, therefore, detecting and true log architectures are used. Although these differ in detail, the general principle behind their design is common to both: instead of one amplifier having a logarithmic characteristic, these designs use a number of similar cascaded linear stages having well-defined large signal behavior.
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