Op-Amp Transistor Log Amplifier at Teresa Cochran blog

Op-Amp Transistor Log Amplifier. In this configuration a transistor is placed in the feedback path of an opamp wired in inverting mode. Note that the transistor is used to turn the input voltage into an input current, with a log function. For high frequency applications, therefore, detecting and true log. This configuration dispenses with the fixed current reference normally employed, and substitutes the output of the reference channel photomultiplier. The classic diode/op amp (or transistor/op amp) log amp suffers from limited frequency response, especially at low levels.

This configuration dispenses with the fixed current reference normally employed, and substitutes the output of the reference channel photomultiplier. For high frequency applications, therefore, detecting and true log. Note that the transistor is used to turn the input voltage into an input current, with a log function. In this configuration a transistor is placed in the feedback path of an opamp wired in inverting mode. The classic diode/op amp (or transistor/op amp) log amp suffers from limited frequency response, especially at low levels.

Analog Multiplier using Opamp Multiplier circuit using log antilog

Op-Amp Transistor Log Amplifier In this configuration a transistor is placed in the feedback path of an opamp wired in inverting mode. This configuration dispenses with the fixed current reference normally employed, and substitutes the output of the reference channel photomultiplier. In this configuration a transistor is placed in the feedback path of an opamp wired in inverting mode. Note that the transistor is used to turn the input voltage into an input current, with a log function. For high frequency applications, therefore, detecting and true log. The classic diode/op amp (or transistor/op amp) log amp suffers from limited frequency response, especially at low levels.

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