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The traditional logarithmic amplifier circuit is described in National Appnote 311:
This circuit uses the difference of two transistor currents to generate the log of the input over a pretty wide range.
The well-matched transistor pair Q1a and Q1b are halves of the LM394 "supermatch" transist...
Is it OK to ask questions that are really just requests to brainstorm with the community?
I'm referring to this question, which just came to the top of the main page. It caught my attention because it mentioned brainstorming explicitly, even in the title. However, this type of question has b...
Phase in waves is the fraction of a wave cycle which has elapsed relative to an arbitrary point.
Formula
The phase of an oscillation or wave refers to a sinusoidal function such as the following:
:x(t) = A\cdot \cos( 2 \pi f t + \theta )\,
:y(t) = A\cdot \sin( 2 \pi f t + \theta ) = A\cdot \cos( 2 \pi f t + \theta -\pi/2),\,
where A, f, and \scriptstyle \theta are constant parameters. These functions are periodic with period \scriptstyle T = 1/f, and they are identical except for a displacement of \scriptstyle T/4 along the \scriptstyle t axis. The term phase can refer to several diffe...
