MIT6_012s09_lec21

MIT6_012s09_lec21 - MIT OpenCourseWare http/ocw.mit.edu...

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

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

View Full Document

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: MIT OpenCourseWare http://ocw.mit.edu 6.012 Microelectronic Devices and Circuits Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms . Lecture 21 Frequency Response of Amplifiers (I) Common-Emitter Amplifier Outline • Review frequency domain analysis • BJT and MOSFET models for frequency response • Frequency Response of Intrinsic Common-Emitter Amplifier • Effect of transistor parameters on f T 6.012 Spring 2009 1 Reading Assignment: Howe and Sodini, Chapter 10, Sections 10.1-10.4 I. Frequency Response Review Phasor Analysis of the Low-Pass Filter • Example: C R V in V out + − + − • Replacing the capacitor by its impedance, 1 / (j ω C), we can solve for the ratio of the phasors • Phasor notation V out V in = 1 1 + j ω RC V out V in = 1/ j ω C R + 1/ j ω C V out ≡ V out V in 6.012 Spring 2009 2 Magnitude Plot of LPF • V out / V in--> 1 for “low” frequencies • --> 0 for “high” frequencies V out / V in V out V in Break point log scale 1 − 3dB 0.1 − 20 1 = 0.707 2 − 40 0.01 1 /ω dB...
View Full Document

{[ snackBarMessage ]}

Page1 / 10

MIT6_012s09_lec21 - MIT OpenCourseWare http/ocw.mit.edu...

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

View Full Document
Ask a homework question - tutors are online