RTU Previous Question Papers BE EC 5th Semester
Linear Integrated Circuits December-2011
UNIT – I
1.Draw the schematic diagram of non-inverting OP AMP with voltage series feedback; explain it and derive the expression for the
(i) voltage gain
(ii) Input Resistance
(iii) Output Resistance.
1. Explain the following applications of OPAMP :
(i) Voltage follower
(iv) Inverting Amplifier
2 (a) Design a triangular wave generator using a comparator circuit with integrator circuit to generate a triangular wave of frequency 5 KHz., Assume peak to peak output voltage is 5V and (±Vsat) = (± 14 V).
(b) Design a R-C phase shift oscillator which gives the sinusoidal waveform of 600 Hz.
2 (a) Draw and explain with suitable diagram : Voltage to frequency converter.
(b) Explain the working of quadrature oscillator with suitable diagram.
UNIT – III
3. (a)Draw and explain with suitable diagram First-order low pass Butterworth filter.
(b)Design a wide band pass filter with fL=500 Hz and fH = 2KHz, and a pass band again = 5 for both sections of filter. Also determine the value of Q for the filter.
(a). Write short note on “switched capacitor filter”.
(b) Design a narrow bandpass filter with a centre frequency fc = lKHz, Q = 5, Af = 8. Change the centre frequency to 2KHz, keeping AF and Bw constant.
UNIT – IV
4. Explain the operation of PLL with the help of block diagram.
Also explain linear model of second order PLL.
4 Briefly describe the role of PLL in the following
(i) AM detector
(ii) Tracking filter
UNIT – V
5 (a) Explain the ‘Tour quadrant Multiplier”.
(b) Design a 555 a stable multivibrator to generate an output pulse with a frequency fQ = 5KHz and a duty cycle of 60%. Given Vcc = 15V and Ic min = 1mA.
5. (a) In the schmitt trigger, RL = 100 q , R2 = 56 Kq , Vin = 2V peak to peak sine wave, and the power supply voltage – + 15 V. Determine the upper and lower threshold voltage, Vut and Vit. The maximum output voltage swing is ± 14 V.
(b) Write short note on Monostable multivibrator.