Lecture1

# Lecture1 - 3. The non inverting input is grounded. Closed...

This preview shows pages 1–4. Sign up to view the full content.

Operational Amplifiers, OP-AMPS The Ideal OP-AMP Ideal OP-AMP with Power Supplies No terminal of the OP-AMP is physically connected to ground. Functions and Characteristics of the Op-Amp 1. The Op-Amp senses the voltage difference at its two inputs, multiplies the difference times A and provided the result at the output. 2. The Op-Amp is not supposed to draw any input current (The Input Impedance is supposed to be Infinite). 3. Terminal 3 is supposed to act as an ideal source (zero output impedance). 4. Op-Amps exhibit common–mode rejection. 5. Infinite open-loop gain 6. Infinite bandwidth 7. Direct coupled or DC amplifiers Inputs Output

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

View Full Document
Differential and Common-Mode Signals The Inverting Configuration 1. Is one of the two basic configurations. 2. 2 R is applying Negative Feedback.

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3. The non inverting input is grounded. Closed Loop gain 1 v v G = The Gain depends only on external components Effect of Finite Open-Loop Gain A R R R R v v G / ) / 1 ( 1 / 1 2 1 2 1 + +-= = A R R < < + + ) / 1 ( 1 1 2 ; 1 2 R R G-= Example 2.1 Ω = k R 1 1 , Ω = k R 100 1 , V v I 1 . = Calculate the closed loop gain, the error and 1 v A 1,000 90.83-9.17-9.08mV 10,000 99.00-1.00-0.99mV 100,000 99.90-0.10-0.10mV ε G 1 v Input and output Resistances 1 1 1 / R R v v i v R I I I i = = = The Weighted Summer The Noninverting Configuration The Closed-Loop Gain Effect of Finite Open-Loop Gain A R R R R v v G I ) / ( 1 1 ) / ( 1 1 2 1 2 + + + = ≡ The Voltage Follower Example 2.2...
View Full Document

## This document was uploaded on 12/28/2011.

### Page1 / 4

Lecture1 - 3. The non inverting input is grounded. Closed...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online