Lecture26-MOSTranSmallSigModelAmplifiers

# Lecture26-MOSTranSmallSigModelAmplifiers - MOSFET Small...

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

ECE 3040 - Dr. Alan Doolittle Georgia Tech MOSFET Small Signal Model and Analysis •Just as we did with the BJT, we can consider the MOSFET amplifier analysis in two parts: •Find the DC operating point •Then determine the amplifier output parameters for very small input signals.

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

View Full Document
ECE 3040 - Dr. Alan Doolittle Georgia Tech MOSFET Small Signal Model and Analysis Linear Two Port Network + V 1 - i 1 i 2 + V 2 - I 1 =y 11 V 1 + y 12 V 2 I 2 =y 21 V 1 + y 22 V 2 General “y-parameter” Network Non-Linear I-V relationship (BJT, MOSFET, etc…) + V 1 - i 1 i 2 + V 2 - Linearize over “small signal range” I GS =y 11 V GS + y 12 V DS I DS =y 21 V GS + y 22 V DS MOSFET “y-parameter” Network v GS v DS i DS i GS
ECE 3040 - Dr. Alan Doolittle Georgia Tech I GS =y 11 V GS + y 12 V DS I DS =y 21 V GS + y 22 V DS [ [ [ I GS y 11 y 12 V GS I DS y 21 y 22 V DS [ = Q V Q V i j ij DS GS V I y , , , = Derivative of current-voltage equation evaluated at the Quiescent Point MOSFET Small Signal Model and Analysis ( 29 [ ] ( 29 TN GS DS DS TN GS n DS V V V for V V V K I - + - = l 1 2 2 MOSFET Amplifiers are biased into Saturation (or Active Mode) 1.) Input Conductance 2.) Output Conductance 3.) Transconductance 0 0 0 0 0 12 11 = = = = = y and y V I and V I I DS GS GS GS GS ( 29 2 22 2 T GS n DS DS V V K y V I - = = l ( 29( 29 DS T GS n GS DS V V V K y V I l + - = = 1 21

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

View Full Document
ECE 3040 - Dr. Alan Doolittle
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 08/23/2011 for the course ECE 3040 taught by Professor Doolittle during the Spring '11 term at University of Florida.

### Page1 / 14

Lecture26-MOSTranSmallSigModelAmplifiers - MOSFET Small...

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

View Full Document
Ask a homework question - tutors are online