Talk:Miller effect

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Discovered effect in 1924 when working with transistors? Transistors were not invented for another 20 years...

The German Wikipedia says that it was discovered in 1924 by a Man from Poland named Nehpets Miller....

I believe the formula should be more like (1 + A)C cheet 22:29, 13 December 2006 (UTC)

Contents 1 Picture needed 2 Confusion between voltage gain and magnitude of voltage gain? 3 Are the signs all-right? 4 Translation into Chinese Wikipedia

[edit] Picture needed

A picture showing how the impedance is connected to the amplifier helps.

Added one. Roger 16:16, 2 May 2007 (UTC)

[edit] Confusion between voltage gain and magnitude of voltage gain?

In the introduction to the article and in the Derivation section, reference is made to the Miller effect multiplying the capacitance by a factor of (1+A_V).

However, in the Notes section is a statement that A_V is a negative number for most amplifiers.

Taking this statement and the earlier statement that the capacitance is multiplied by a factor of (1+A_V) literally would seem to imply that the capacitance is reduced for small A_v (between 0 and -1), and becomes negative for large A_v (more negative than -1).

This seems nonsensical.

I believe the statements in the introduction and in the Derivation section should be that the Miller effect multiplies the capacitance by a factor of (1-A_v), where A_v is a negative number for the most frequently used amplifier configurations (i.e. common-emitter and common-source amplifiers), as a result of a 180-degree phase change between the input and output.

Note that if A_v is negative, then (1-A_v) results in a multiplication of the capacitance between the input and output.

Am I correct? Or do people think I'm the one who is confused? —The preceding unsigned comment was added by 129.82.228.111 (talk) 15:20, 12 April 2007 (UTC).

[edit] Are the signs all-right?

In the derivation formulas there's some problem with signs, I think...I end up with (1+Av)..

Yes, there was a small mistake in the derivation. It should have been V₂ = A_VV₁ instead of V₂ = − A_VV₁. It should be ok now. Roger 15:37, 2 May 2007 (UTC)

Made some more changes, should hopefully be clearer now. Roger 16:16, 2 May 2007 (UTC)

[edit] Translation into Chinese Wikipedia

The 19:30, 26 March 2008 Brews ohare version of this article is translated into Chinese Wikipedia.--Philopp (talk) 12:21, 25 May 2008 (UTC)