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GATE 2020: Digital Electronics Quiz 7

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Question 1

What is the output voltage ‘V₀’ of the R-2R decoder ladder network?
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Question 2

If the input of a DAC is changed from 0111110100 to 0111111001 then output voltage change is 25 mV. The full scale reading of DAC is

Question 3

The ratio of maximum conversion time of 8 bit digital ramp type ADC to that of 8 bit successive approximation type is _____. (Assume both are applied with the clock of 20 kHz)

Question 4

For the 8-bit DAC with reference voltage V_R=5V. If the digital input is 1000 0100 then find the analog output in volt.

Question 5

Match List -I (types of ADC) with List-II (conversion time in µsec) and select the correct answer using the codes given below the lists where ADC is 8-bit and clock frequency is 1MHz.
List -I
A) Counter type
B) Successive Approximation Resistor
C) Flash
D) Dual slope
List-II
1) 8 µsec
2) 1 µsec
3) 512 µsec
4) 128 µsec

Question 6

Find the conversion times of the following two voltages with the help of following Analog to Digital converter using 5-bit SAR.

V_analog = 7 Volt, 15 volt and clock period are T_CLK = 2 nsec.

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ESE & GATE EE Digital Electronics

Aug 25ESE & GATE EE