opampfeedbackgain-bw-prod

opampfeedbackgain-bw-prod - OP-AMP AS A CLASSKAL FEEDBACK...

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Unformatted text preview: OP-AMP AS A CLASSKAL FEEDBACK SYSTEM OP-AMP CHECUW: CLASSICAL FEEDBACK.’ # Ag) D‘FLEEENCE FORM/MED SAW ‘ Vou’c h R¢ _ 5‘ R,+ F31 FOR THIS CIRCUIT :- 5: “FEEDBACK FACTOE” FRACTION OF Vt,ch FED BACK 10 v. vouf AS X _ “900’: .. A - Ga _— Vowt— A(Vm ’/3Vou+> :> vm AS Aioo WHAT \3 CLOSED LOOP SAW (5 wHEN A IS FINITE? REAL OP~AMF> HAS SINGLE POLE TQANSFE'R FUNCTION A:A(s)'-r --°S A0 MS) 2 91-: + a); 5 ACRES WE‘LL PaQwr'wb) AQOUND we wb wt soasmnm: w c; EXPRESSION UJt A “*3 MULTIPL‘! NUM, DEN : .__.___.__.—. : W 5 HA5 “BE: BY Mt MASSAGE NT?) GENERAL FIRST ORDER FORM G : [on 6AM S J + [Wye] “‘3 S E DC CAN 3 ,60/1 ' C: H651: S :> s < 3 6004: 0.0550 LOOP ’3 wt E BAMOWIDTH age OAw~ BANDWI DTH TRADEOFH: WHEN HE CHOOSE A FEEDBACK FACTOR A (FRACTION <1) TO GET A CLOSED LOOP DC GAIN OF 3:— CLOSED LOOP BANOWID‘n-l w3d8 ts awf L)le GAIN FREQUENCY wt REDUCED BY ,8 FACTOR leaQSE RELATIONSHIP: PRODUCT Is CONSTAle [CLOSED LOOP] X [CLOSED LOOP] _ [GAIN-BANOWDTH] a. GAIN BANDNH’H WCT I ‘~" 13 Wt W4: /3 \A,‘ .. W nge UNITY GAIN FREQUEch FOR LM‘ILH, fl: IMHZ Fora LF35¢6 11'} -= 4 MHZ I {SEA PHI c A L w 7 TEL ...
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opampfeedbackgain-bw-prod - OP-AMP AS A CLASSKAL FEEDBACK...

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