Logarithmic Amplifier Diagram. The figure shows a simplified block diagram of a log amp. The core of the device is a cascaded chain of amplifiers.

Tl441 logarithmic amplifier slvs328 october 2000 2 post office box 655303 dallas texas 75265 functional logic diagram one half 15 db 15 db log log log log σ y z y z a1 b1 ca2 cb2 ca2. Here is a schematic diagram of one classic example of general purpose logarithmic converter circuit employing lm1556 op amp. Logarithmic amplifier slfs038 june 1976 revised february 1989 post office box 655303 dallas texas 75265 1 excellent dynamic range wide bandwidth built in temperature compensation log linearity 30 db sections 1 db typ cwide input voltage range description this monolithic amplifier circuit contains four 30 db logarithmic stages.

Like previous generations today s dc log amp possesses op amp input structures bjt feedback a differencing amplifier and temperature compensation.

The circuit below is a logarithmic amplifier using an mc1556 op amp. Logarithmic amplifier description packaged in a ceramic double wide dip the 4127 is the first hybrid logarithmic amplifier that accepts. For simplicity of explanation in this example we have chosen a chain of 5 amplifiers each with a gain of 20 db or 10. Like previous generations today s dc log amp possesses op amp input structures bjt feedback a differencing amplifier and temperature compensation.