Chapter 3 Applications of resistive circuits

Size: px

Start display at page:

Download "Chapter 3 Applications of resistive circuits"

Adrian Briggs
6 years ago
Views:

1 Chapte 3 pplcat f ete ccut 3. (ptal) eal uce mel, maxmum pwe tafe 3. mplfe mel ltage amplfe mel, cuet amplfe mel 3.3 Op-amp lea mel, etg p-amp, etg p-amp, ummg a ffeece p-amp (ptal) teal p-amp etace, DC mete 3-

2 3. eal uce a pwe tafe Optal. eal uce mel g ltage uce: ~, << g cuet uce: ~, >> 3-

3 . eeal uce cect () ltage uce: ee t pe a hghe put ltage upply ( paallel) () cuet uce: paallel t pe a hghe put cuet upply ( ee) 3-3

4 3. meauemet f uce mel () ltage uce meaue.c. ltage c () cuet uce c ajut utl meaue.c. cuet c c ajut utl 3-4

5 3. maxmum pwe tafe: f fxe S, the maxmum pwe tafee fm uce t the la a S a 50% <50% 50% >50% p ( ) p ( ) p p max 0, η 4 p p etace match p 3-5

6 3. mplfe mel Bac. ltage amplfe mel (mall-gal mel) CS : put etace c (t): pe-ccut put ltage (t) : put etace : pe-ccut ltage ga () t () t c c µ < µ a g ltage amplfe: >>, << ~ : ltage ga 3-6

7 . cuet amplfe mel (mall-gal mel) CCCS c (t): ht-ccut put cuet : ht-ccut cuet ga : cuet ga () t c β < () t c β a g cuet amplfe: <<, >> ~ 3-7

8 Dcu. Ex.3.4 a tw-tage amplfe cacae tuctue a a tauce: (t)0.wt, 8k ( 0 cuet lmt), amplfe mel: 4k, k, -0, ece: 0 cale, 5k, f () t ( 0) ( 0) 60 0 () t c x c < c x c () t 60 () t 6 wt, < 0 () t ( t) 3.5 wtµ, < 0u

9 3.3 Op-amp Bac. etg put etg put : ffeece p ltage () t () t p : pe-lp ga lea eg 3-9

10 . ea mel 0 ( ) p ( ) ( 0) p ( D.) 3. Ieal p-amp put temal a tual ht 0 ( c..), 0 ( c..) p ( D.9) 3-0

11 Dcu. Op-amp ca pefm,,,,, /t. algebac peat.. I pactce, a typcal p-amp ha >0 4, PS <30 put gal < max ~3m, hece t ale t a pactcal amplfe. 3. Op-amp chaactetc the magtue f the ffeece ltage ey mall the put ltage eetally epeet f p-amp ga the cuet t the etg a etg temal p, ae eglgble the equalet put etace eglgble 4. It mt cmm t hae a egate feeback cectg betwee the put a etg temal e t ge a lea amplfcat f pactcal put gal ge a table ltage ga, epeet f uelable ga, a. 3-

12 5. Netg ltage amplfe p feeback ltage B, B : feeback fact B B B egate feeback, B: lp ga, :cle-lp ga B B 3-

13 6. Netg amplfe mel epe the feeback ccut, t B B>> yel t be the lea eg f p-amp << B B>> B lag effect at put put ( t epeet, ), : ltage ga, :k ~00k B B

14 f f f 7. Ex. 3.5 Deg a etg amplfe ge (t) max 0., 0 5, PS max B 5 max kω B 00 mplfcat t epeet < PS, 98kΩ B B 000, B 4000, 0. < B < 60 0.m, 50 ( 0 B B )

15 8. ltage fllwe: amplfcat egale f S a B B (, ) 0 ( ) ltage fllwe (buffe amplfe) ue t elmate the lag effect f t ( B.3) 3-5

16 9. Ex.3.6 aalyze a etg cuet amplfe ug eal pamp mel t eteme a / p p p p K K K K K,, 0 0 epe a 3-6

17 0. Ietg ltage amplfe tual gu, uce lag effect tual gu f >> 3-7

18 . Ietg ummg amplfe (ca be geealze t multple put) 0 upept 0 ( ) ( ) 3-8

19 . Ex.3.7 Ge tw gal uce, a (t) 5m, b (t) 50m, 0, eg a p-amp t ge (t)00 a (t) -40 b (t) >> etg p-amp etg ummg p-amp ( t) 00 ( t) 40 ( t) 40[ 5 ( t) ( t)] a b a b > f lea peat max a max b max PS 3-9

20 3. Ex.3.8 Dffeece amplfe etg p - amp f 0 etg p - amp f 0 ) ( ) ( ) ( f p f p 3-0

21 3-3.4 Iteal p-amp etace Optal. Negate feeback wll ehace the put a put etace chaactetc f a p-amp B t t f f t f t f t B f f f B B ] [ )] ( ) ( [ ) ( ) //( ', ' ', f put etace / ) ( ) / ( ) ( ) ( f put etace >> >> ee paallel

22 3.5 DC mete a meauemet Optal. DC ltmete: a g ltmete hul hae lage m Ω Ω Ω k k m k uf uf f m f m m uf m m u u m m , 50, 5 full cale. DC ammete: a g ammete hul hae mall m f m uf m u u m I I I I I I full cale 3-

23 3. DC hmmete: ly meaue late -eegze et a be awae f amagg ccut by teal uce u u 0 0 f am u am am, am am u a // m am am f : lea a backwa cale 3-3

T-model: - + v o. v i. i o. v e. R i

T-model: - + v o. v i. i o. v e. R i T-mdel: e gm - V Rc e e e gme R R R 23 e e e gme R R The s/c tanscnductance: G m e m g gm e 0 The nput esstance: R e e e e The utput esstance: R R 0 /c unladed ltage gan, R a g R m e gmr e 0 m e g me e/e