I can't figure out the op amp formula, can someone help me look at it?

sunboy25 · Published on 2020-11-15 10:39

I can't figure out the op amp formula, can someone help me look at it? [Copy link]

This is the formula in the picture above. What I don't understand is how the VL drawn with a red line is merged into the formula below. Could you please teach me?

blade365 · Published on 2020-11-11 18:53

Which edition is this?

sunboy25 · Published on 2020-11-12 10:08

blade365 posted on 2020-11-11 18:53 Which version are you on?

Fourth Edition

sunboy25 · Published on 2020-11-12 22:01

blade365 posted on 2020-11-11 18:53 Which version are you on?

Could you help me figure out what's going on?

gmchen · Published on 2020-11-15 10:39

This post was last edited by gmchen on 2020-11-15 10:41

Who said VL was merged? !

The book says: Eliminating VD from the first two equations gives us the form of 2.5a. The following A and Ro are coefficients in 2.5a, not IO! VL exists in 2.5a!

Read the book carefully!

sunboy25 · Published on 2020-11-16 09:08

gmchen posted on 2020-11-15 10:39 Who said VL was merged? ! The book says: After eliminating VD from the first two equations, we get the form of 2.5a. The following A and Ro are both in 2.5a...

Master, you are right. It seems that I didn’t read the book carefully. Thank you for your guidance!

I can't figure out the op amp formula, can someone help me look at it? [Copy link]

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