1. A Hartley Oscillator circuit having two individual inductors of 0.5 mH each is designed to resonate in parallel with a variable capacitor that can be varied from 100 pF to 500 pF. Determine the upper and lower frequencies of oscillation and also the Hartley oscillator’s bandwidth.

(8 marks)

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2. An engineer measures the 3-dB frequencies of a symmetric band-pass filter as 9.34 kHz and 10.21 kHz. Calculate the resonant frequency (𝑓o) and the bandwidth of the filter.

(8 marks)

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3. Design a 2nd order High-pass filter using the Sallen-Key circuit having the cut-off frequency of 100 Hz. Draw the filter circuit clearly with all values for capacitors and resistors are define. Assume capacitor used is 1 F and gain, K = 1.586.

(14 marks)

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4. Plot the transfer curve for the following MOSFET’s circuit and determine IDQ, VGSQ and VDS.

(20 marks)

Jan2014 |Page 4