EE302Lecture21 - The I nver ti ng Ampl i fi er We want to...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1 The Inverting Amplifier Ideal Op Amp Rules: 1. No current flows into either input terminal. 2. There is no input voltage difference between the two input terminals. R f R 1 v i - + + v o - i 1 i 2 V 1 V 2 Due to Rule 1 and KCL: i 1 = i 2 v 2 = 0 Due to Rule 2: v 1 0 We want to find the voltage gain : A v = v o / v i Note: We are assuming that the circuit operates in the linear region.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 The Inverting Amplifier 1 1 2 1 1 1 1 2 1 amp op ideal an for 0 v But v amp op ideal an for R R v v A Gain R v R v R v v R v v i i f i o v f o i f o i - = = = - = = = - = - = R f R 1 v i - + + v o - i 1 i 2 V 1 V 2 Equivalent Circuit: (R f /R i )v i R 1 + v i - + v o -
Background image of page 2
3 The Inverting Amplifier 1 1 2 1 1 1 1 2 1 amp op ideal an for 0 v But v amp op ideal an for R R v v A Gain R v R v R v v R v v i i f i o v f o i f o i - = = = - = = = - = - = This is often called the “closed loop gain”. R f R 1 v i - + + v o - i 1 i 2 V 1 V 2 Equivalent Circuit: (R f /R i )v i R 1 + v i - + v o -
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Feedback The closed-loop gain A v is independent of the open loop gain of the op-amp.
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/13/2010 for the course EE 302 taught by Professor Mccann during the Spring '06 term at University of Texas at Austin.

Page1 / 19

EE302Lecture21 - The I nver ti ng Ampl i fi er We want to...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online