STUPIDSID
1 (a)
Draw equivalent circuit representation of two wire transmission line. Explain primary and secondary parameters for the same.
5 M
1 (b)
Explain chip resistor and chip inductors with neat diagram.
5 M
1 (c)
Define : smith chart, compressed Smith chart, VSWR, Reflection co-efficient, characteristic impedance.
5 M
1 (d)
Explain physical properties of semiconductors.
5 M
2 (a)
Show that ruturn loss and insertion loss can be expressed in terms of voltage standing wave ratio as -
\[ RL=20 \log \dfrac {SWR +1}{SWR -1}\\ \\IL=20 \log \dfrac {SWR+1}{2\sqrt {SWR}} \]
\[ RL=20 \log \dfrac {SWR +1}{SWR -1}\\ \\IL=20 \log \dfrac {SWR+1}{2\sqrt {SWR}} \]
10 M
2 (b)
The characteristics impedance of coaxial cable is 75 Ω and assumed lossless. If the load is short circuit. Find the input impedance if cable is 2 wavelength, 0.75 wavelength, 0.5 wavelength and one wavelength in length.
10 M
3 (a)
Find the attenuation of 4-elemets, 2-5 dB ripple, low pass Chebyschev filter at \[ \dfrac {W}{W_c} =2.5 \]
10 M
3 (b)
Explain Richard's transformation and kuroda's identity. How they are used in realization of RF filter ?
10 M
4 (a)
Derive power consideration for transmission line when -
(i) Load and source impedance are matched.
(ii) Load impedance is matched and source impedance is mismatched.
(i) Load and source impedance are matched.
(ii) Load impedance is matched and source impedance is mismatched.
10 M
4 (b)
Draw electric equivalent circuit for high frequency capacitor with characteristics. Compute high frequency impedance of 20 PF capacitor in terms of frequency whose dielectric medium consists of an aluminium oxide possesing a series loss tangent of 10-4 and whose leads are 1.25 cm with AWG 26 copper wire σcond=64.516 × 105 Ω-1 m-1
10 M
5 (a)
Show the RF small signal circuit model of BJT and equivalent model using miller effect. Find the values of Cm3, Cm2 in terms of Ccb, Vbe and Cce
10 M
5 (b)
Explain structure of microstrip line along with design steps for microstrip line.
10 M
6 (a)
Explain different filter parameters along with generic attenuation profile diagram.
10 M
6 (b)
A transmission line of characteristics impedance Z0=50Ω and d=0.18 Ω is terminated in a load impedance of ZL=(25-j30)Ω. Find reflection coefficient, input impedance at distance d and VSWR by using Z-Smith chart.
10 M
Write short notes on following :-
7 (a)
High Electron Mobility Transistor
5 M
7 (b)
PN-junction diode
5 M
7 (c)
Diode Models
5 M
7 (d)
AC parameters of Bipolar Transistor.
5 M
More question papers from RF Modelling and Antennas