EC 1261 — ELECTRONIC CIRCUITS
B.E./B.Tech. DEGREE EXAMINATION, APRIL/MAY 2008. Third Semester Electronics and Instrumentation Engineering EC 1261 — ELECTRONIC CIRCUITS ¤Common to Instrumentation and Control Engineering) (Regulation 2004) Time : Three hours Maximum : 100 marks. Answer ALL questions. PARTA — 10 x 2 = 20 marks 1. Draw the fixed and self bi ¤s mi ;uit of BJT. 2. Draw the h-parameter eqiivalent circuit of a Common—emitter transistor. 3. What is CMRR 4. Draw a tuiresl circuit. 5. Define feedback factor. 6. What are the conditions of oscillation in sinusoidal oscillators. 7. What is time constant in a RC circuit? 8. What is a clipper? 9. Define peak inverse voltage of a rectifier. 10. Draw the functional block diagram of SMPS. PART B -— (5 x 16 : 80 marks) A11. (a) (i) Derive the expressions for the input resistance, voltage gain,current gain, and output admittance of a transistor amplifier interms of h-parameters. (8) (ii) Explain about Cascode and Darlington connections. (8) Or (b) ...