Studio_4

Studio_4 - 1 Studio 4 Review • Common Source Amplifer...

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

View Full Document Right Arrow Icon

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

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

Unformatted text preview: 1 Studio 4 Review • Common Source Amplifer, Resistive Load • Small Signal Modeling 2 Review operating regions: N-channel MOSFET G A T E DRAIN REGION FIRST ORDER BEHAVI O R NOT EXACTLY: V DS > V GS- V TH SATURATION DRAIN "LOOKS LIKE" CURRENT SOURCE; I D DEPENDS ONLY ON V GS- V TH CHANNEL LENGTH MODULATION I D DEPENDS SOMEWHAT ON V DS V GS > V TH V DS < V GS- V TH TRIODE D-S CHANNEL "LOOKS" RESISTIV E I D = V DS / R on R on DEPENDS ON V GS- V TH NONLINEAR AS V DS INCREASES V GS < V TH |V DS | < V bkd CUTOFF SWITCH "OFF" I D = 0 I D ! pA to nA SUBTHRESHOLD CURRENT BREAKDOWN IF |V DS | EXCEEDS V bkd I D = μ n C ox W L V GS " V TH ( ) V DS " V DS 2 2 # $ % & ’ ( I D = μ n C ox 2 W L V GS " V TH ( ) 2 I D = μ n C ox 2 W L V GS " V TH ( ) 2 1 + ) V DS [ ] R on = 1 μ n C ox W L V GS " V TH ( ) 3 Review MOSFET: Vary V DS (V GS fxed) • Need V GS > V TH (avoid cuto¡¡ region) V DS = V GS- V TH SATURATION TRIODE 4 • Need V DS > V GS- V TH (avoid triode region) Review MOSFET: Vary V GS (V DS fxed) V TH SATURATION CUTOFF 5 Common Source Amplifer V IN goes up ⇒ V OUT goes down • V IN goes up ⇒ Increase V GS ⇒ Increase I D • KVL path For V out V out = V DD- I D R D • MOS¡ET in saturation: • I D increases ⇒ I D R D drop increases ⇒ V OUT goes down 6 Common Source Amplifer • INVERTING GAIN GATE ⇒ DRAIN V IN goes up ⇒ V OUT goes down V G V D 7 Build up input-output characteristic • V IN < V TH ⇒ V GS < V TH ⇒ Cutoff: I D = 0 V OUT = V DD V TH SATURATION CUTOFF 8 Build up input-output characteristic • V IN > V TH V GS > V TH • Saturation: I D from square law V OUT = V DD " μ n C ox 2 W L V in " V TH ( ) 2 I D 1 2 4 4 4 3 4 4 4 R D V TH SATURATION CUTOFF 9...
View Full Document

{[ snackBarMessage ]}

Page1 / 28

Studio_4 - 1 Studio 4 Review • Common Source Amplifer...

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