1
GATE ECE 1995
Fill in the Blanks
+1
-0
A power Amplifier delivers 50 W output at 50% efficiency. The ambient temperature is 25$$^\circ$$ C. if the maximum allowable junction temperature is 150 $$^\circ$$ C, then the maximum thermal resistance $${\theta _{Jc}}$$ that can be tolerated is
2
GATE ECE 1995
Subjective
+5
-0
Shown that the system in Fig. is a double integrator. In other words, prove that the transfer gain is given by $${{{V_0}\left( s \right)} \over {{V_i}\left( s \right)}} = {1 \over {{{\left( {CRs} \right)}^2}}},$$ assume ideal OP -AMP
3
GATE ECE 1995
+1
-0.3
If the number of bits per sample in a PCM system is increased from n to n+1, the improvement in signal-to-quantization noise ratio will be
A
3 dB
B
6 dB
C
2n dB
D
n dB
4
GATE ECE 1995
+1
-0.3
The signal to quantization noise ratio in an n-bit PCM system
A
depends upon the sampling frequency employed.
B
is independent of the value of 'n'.
C
increasing with increasing value of 'n'.
D
decreases with the increasing value of n'.
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