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As usual, Maxim parts do not exist. This circuit uses the difference of two transistor currents to generate the log of the input over a pretty wide range. That would more-or-less be an interpolation between 3dB values. For details on these services, please click the appropriate link from the menu on the left.
You can find them datasehet But the plant does not sell them directly. Home Questions Tags Users Unanswered. I had this idea for a quick and dirty log amp. Chris Johnson 7 The transistors might be on separate dies for all I know. The traditional logarithmic amplifier circuit is described in National Appnote Intersil makes a number of transistor arrays some are certainly single die and well matched.
I tried adjusting the Hfe of the transistors and unless it was something like it kept a very clean log output. How can I cheaply make a logarithm? I just get the default circuit. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count.
Thank you for your interest in this question. The ECE Store provides many services to electrical and computer engineering students in order to create a safe environment in which students have access to the equipment and datasjeet they need. Roman has mentioned that component. What is the new standard log amp circuit? Octopart is not comprehensive.
You can also see open positions in the department. MAT12 is still in production, but octopart. The specs are identical to the original. If you modulated the reference voltage by 3dB, the output would probably average to about the right value. Especially in this circuit, which lives and dies by transistor matching, the simulator is going to give a very optimistic performance estimate.
TI still sells some Burr Brown log amps but they are expensive. TOP Related Posts.
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