LECTURE 10 (students) - LECTURE 11 LECTURE 11....

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
CTURE 1 LECTURE 11. SEMICONDUCTOR & DIODES structor: Prof. kyu ark Instructor: Prof. Inkyu Park Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) MAE307 Applied Electronics
Background image of page 1

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

View Full DocumentRight Arrow Icon
Review of Lecture 7 perational Amplifier Operational Amplifier MAE307 Applied Electronics
Background image of page 2
Operational Amplifiers Ideal OP-Amp behaves as an ideal difference amplifier (amplifies the difference between two input voltages). ear finite input resistance (R and very large output resistance (R Near-infinite input resistance (R in ) and very large output resistance (R out ).   v v A t v OL V out ) ( ) ( : Open-loop voltage gain (10 5 -10 7 ) ) ( OL V A v : Noninverting input : Inverting input v Due to near-infinite input resistance, it is usually assumed that the input current is zero. 0 in i Due to near-infinite open-loop gain, MAE307 Applied Electronics v v
Background image of page 3

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

View Full DocumentRight Arrow Icon
Operational Amplifier in Closed-Loop Mode : Inverting Amplifier - In the open-loop model for the op-amp,   v A v v A v OL V OL V out ) ( ) ( Connected to the ground (zero) - CL at node A : node A in F S i i i eedback current ource current Input current=0 KCL at node A : Feedback current Source current S S v v i out F v v i 0 in i S R F R 0 / / ) ( ) ( OL V out out OL V out S out S R A v v R A v v R v v R v v F S F S 1 / 1 / 1 L L out S A R R A R R v v out S v R R F out R R v v MAE307 Applied Electronics ) ( ) ( OL V S F OL V S F F Near infinite S S
Background image of page 4
Operational Amplifier in Closed-Loop Mode : Noninverting Amplifier -KCL a t node A , node A S in S F i i i i F out F R v v i S S R v i Here, t node B S F out R v R v v (1) node B - At node B S v v 0 in i S v v v Thus, (1) S S F S out R v R v v S F S out R R v v 1 Noninverting amplifier closed-loop gain (always positive & >1) MAE307 Applied Electronics
Background image of page 5

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

View Full DocumentRight Arrow Icon
Active Filters : Low-pass filter F F F F F F R C j R C j R Z 1 1 || F F S F S F in out LP R C j R R Z Z j V V j A 1 / ) ( ) ( F P R 1 Amplification factor Low-pass filter F F S LP R C j R j A 1 ) ( 10 .1 1 0.01 0.1 1 100 ** Compare w/ passive filter 0.01 0.1 R F =1MΩ C F =1μF MAE307 Applied Electronics 0.001 R S =0.1MΩ
Background image of page 6
Active Filters : High-pass filter S S S S S S C j R C j C j R Z 1 1 S S F S S F in out HP R C j R C j Z Z j V V j A 1 ) ( ) ( R C j R Amplification factor High-pass filter S S S S S F HP R C j R j A 1 ) ( 1 0.01 0.1 1 10 100 ** Compare w/ passive filter S 0.01 0.1 R S =1MΩ C S =1μF 10M S MAE307 Applied Electronics 0.001 R F =10MΩ 10/30
Background image of page 7

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

View Full DocumentRight Arrow Icon
Ideal Integrator Integrator & Differentiator: By combining the energy storage elements with op-amp circuit, one can realize the integrators or differentiators.
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/21/2010 for the course MECHANICAL mae302 taught by Professor Jang during the Spring '10 term at Seoul National.

Page1 / 49

LECTURE 10 (students) - LECTURE 11 LECTURE 11....

This preview shows document pages 1 - 9. Sign up to view the full document.

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