Lecture%2033_April%2020%202011

Lecture%2033_April%2020%202011 - Chapter 15 Differential...

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

View Full Document Right Arrow Icon
Click to edit Master subtitle style Jaeger/Blalock 7/28/10 Microelectronic Circuit Design, 4E McGraw-Hill 133 -1 Chapter 15 Differential Amplifiers and Operational Lecture 33 Cover Section: 15.2
Background image of page 1

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

View Full DocumentRight Arrow Icon
Jaeger/Blalock 7/28/10 Microelectronic Circuit Design, 4E McGraw-Hill 233 -2 Two-stage Prototype of an Op Amp For higher gain, pnp C-E amplifier is connected at output of the input stage differential amplifier. Virtual ground at emitter node allows input stage to achieve full inverting amplifier gain without needing emitter bypass capacitor. PNP transistor permits direct coupling between stages, allows emitter of pnp to be connected to ac ground and provides required voltage level shift to bring output back to zero. Bypass and coupling capacitors are thus eliminated. Differential amplifier provides desired differential input,CMRR and ground referenced output as the input stage of op amp.
Background image of page 2
7/28/10 Microelectronic Circuit Design, 4E McGraw-Hill 333 -3 Two-stage Op Amp: DC Analysis This circuit requires a resistance in series with emitter of Q3 to stabilize Q-point (as collector current of Q3 is exponentially dependent on base- emitter voltage), at the expense of voltage gain loss. From dc equivalent circuit, IE1= IE2 = I1 /2. If base current of
Background image of page 3

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

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/31/2011 for the course ECE 12512 taught by Professor Johnation during the Fall '10 term at IUPUC.

Page1 / 13

Lecture%2033_April%2020%202011 - Chapter 15 Differential...

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

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