Class Test 01
2
Class test-01 Analog Electronics Circuit (AEC-I) Full marks: 15 Time: 45min Answer all: 1. Prove that larger the V out drop across emitter resistance smaller the % of change in collector current due to variation of I co and V BE in self bias circuit. [4] 2.Find h ib and h rb in terms of CE mode h-parameters [4] 3. For the circuit shown n Fig.01 R 1 =100K, R 2 =20K , R L =10K, Voltage source resistance R s =10K, R E =1K uses a BJT whose h-parameters are: h ie =1.1K, h re =2.5 x 10-4, h fe =50 h oe =25µA/V. Calculate A I =I 0 /I i , R i , A v , A vs . [4] 4. Short type question [1 x 3] (i) Which configuration (CE,CB,CC) has lowest R i , lowest R 0 , highest A v ? (ii) Why performance of fixed bias circuit is unsatisfactory if the BJT is replaced by another one of same type? (iii) What is emitter follower? Mention its advantages.
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Transcript of Class Test 01
Class test-01Analog Electronics Circuit (AEC-I)Full marks: 15 Time: 45minAnswer all:1. Prove that larger the Vout drop across emitter resistance smaller the % of change in collector current due to variation of Ico and VBE in self bias circuit. [4]2. Find hib and hrb in terms of CE mode h-parameters [4]3. For the circuit shown n Fig.01 R1=100K, R2=20K , RL=10K, Voltage source resistance Rs=10K, RE=1K uses a BJT whose h-parameters are:hie=1.1K, hre=2.5 x 10-4, hfe=50 hoe=25A/V. Calculate AI=I0/Ii , Ri, Av, Avs. [4]
4. Short type question [1 x 3](i) Which configuration (CE,CB,CC) has lowest Ri, lowest R0, highest Av?(ii) Why performance of fixed bias circuit is unsatisfactory if the BJT is replaced by another one of same type?(iii) What is emitter follower? Mention its advantages.
Fig.01
