1
GATE ECE 2008
MCQ (Single Correct Answer)
+2
-0.6
In the following circuit, the comparator output is logic “I” if V1 > V2 and is logic “0” otherwise. The D/A conversion is done as per the relation $${V_{DAC}} = \sum\limits_{n = 0}^3 {{2^{n - 1}}{b_n}\,\,} Volts,$$\$ where b3(MSB), b2, b1 and b0 (LSB) are the counter outputs.

The counter starts from the clear state.

The stable reading of the LED display is

A
06
B
07
C
12
D
13
2
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
In the digital-to-Analog converter circuit shown in the figure below,
$${V_{R\,}}\, = \,10V$$ and $$R\, = \,10k\Omega$$

The current i is

A
$$31.25\,\mu {\rm A}$$
B
$$62.5\,\mu {\rm A}$$
C
$$125\,\mu {\rm A}$$
D
$$250\,\mu {\rm A}$$
3
GATE ECE 2007
MCQ (Single Correct Answer)
+2
-0.6
In the digital-to-Analog converter circuit shown in the figure below,
$${V_{R\,}}\, = \,10V$$ and $$R\, = \,10k\Omega$$

The voltage V0 is

A
-0.781V
B
-1.562V
C
-3.125V
D
-6.250V
4
GATE ECE 2006
MCQ (Single Correct Answer)
+2
-0.6
A 4-bit D/A converter is connected to a free-running 3-bit UP counter, as shown in the following figure. Which of the following waveforms will be observed at V0=?

In the figure shown above, the ground has been shown by the symbol $$\nabla$$

A
B
C
D
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