Chhattisgarh Swami Vivekanand Technical University 2008-4th Sem B.E Electronics & Tele-Communication Engineering (analog, il-08) - Question Paper

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Ii. K. (Fotirdi ScmcsdT) lxsunin:i(iun,

2008

(KKK, Kl & T, IT En. Brunch) ANALOC. KIJCCTKONIC: CIRCUITS

Time Allowed : Three hours

0

tximum Marks : SO Miiumuin Pass Marks : 28

Note : Part (a) f every unit is compulsory. Attempt any hyp part of (It), (c) <fc (d). Answer should he hriof and to the point, (Jnnetvssvry lonx answer may results in loss of marks.

Uni'-.

I. (it) State Miller'.1 theorem.

(b) Draw the low frequency hybrid model for CIC

PTO

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I 2 I

ami tfcmv i \nltujy |?nn.

current goin and miliMit .uliintniiuc fr t'K conligumtion

(v) l>tm\ ilk* cirvtni .luyrjin .} JXichiiKUm \\ut X j;w coni|Mii>iu between ('l\. ( 7< \ t ('cnHfiisuiitinuis.

(d) Ur.w I he circuit diagram of cmmn. drum (H>) bhl amplifier and liow Hut it vollup; gum is leu. then unity.

Unii-ll

2. (a) Incline Noise Figure.

(10 l>mw iltc circuit dugium of liyliiol n iiMdvl iti <'/' CimligtmilHm.il high irv|ikih:ic>. lltc ilillcrciil

involved in flu* ciiant.

(d A high rronKiK'y iroswtft* w iimiI iii (/'rttnligw.iimn following r pnmmelir# ;

V IWUJ, *1 M. i W1 Ml c_r - 100 PF, C_t - 3 l*F ami 5 mA/v If the load teiistmtcc K, is I ItJ Calculnic ihe value of ti|>pcr .VdH cut off frequency

(d) A jungle aliige Itigli Ac*tiiiiicy (A* amplifier kliow* n <MW (Own Mandwidth 1'iodueU of S MM? when K,

. 5(10 l>. ink I'if.t' l>H*ncy ln timl lU hillnwm,.

pjrnilKtCfS

hf_t - 100, K * ^{100 ,nA/v}

r. - IOU IV. C, - 1 l'l^: umi /; -IlHrMH/.

I'UnI.

t

(1) iliv value of source rosisCmce ilini will )>ivc required bandwidth.

(ii) will) ilils value ofvumrcc icsistuiKi' lml the mid band |pin.

u.iu-in

(;i) Wlnl ilu you iiHMtt liv fru|ii*'uv rtspnu' nt .m AiNfriitK'f?

(b) l>iii\v IIk-cikhiI diagiain til a two vIjjjc !<<' Limplvil Amplifier. Slmw Imhv iIic mufimmlc uimI plww utij'.U*

of ils voltage gain vnry with frequency? ?

(c) Wlmi sue ihc ttftjiiimttcnUofu miiliixiniH' nmjilUWr'?

I.lit iIk advunloito & ilindvuiil,i|;fs of K-C vmiplvd umpltfiw. 7

(d) tixpluin dilTvrcnl iy|Ks ol'diuimimi vxikl in imtiililicik. '

UiiIMV

(n) An umphficr hitvinu nn n₍xn loop umn of Kl.ltOU i cmmecicd in a nciiiitvc ferilbiii-k oinlljiiifioinn wnlt

n feedback factor ofO-1. what is the closed loopgnin of the amplifier?

(b) I'Aplain lhe concept f feedback in amplifier I isi the uu|)otl;iii| pioiKilic.s ol negiiliw t.edkick

(c) Draw the circuit diagram of voltaic shunt feedback amplifier and derive an expression fix input and outjHil impedance.

(d) Define bandwidth ;iml M.ilxlny u-Litcd t> feedback amplifier. Show (ha( stability and bandwidth of iti amplifier increases by employing negative feedback.

Unil-V

(a) Draw the equivalent circuit of crystal.

(b) Draw the circuit diagram of pliase shirt oscillator and explain its working principle.

(e) Draw the circuit diagram of Wien bridge oscillator. Derive an e.\pression of frequency of oscillation.

(d) Draw the basic circuit diagnun of Hanley aixU olpils, oscillator Wiite cxpresion for oscillation frequency and also mention the minimum gam required for sustained oscillation.

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