GATE ECE
Digital Circuits
Analog to Digital and Digital to Analog Converters
Previous Years Questions

## Marks 1

Consider the circuit shown with an ideal OPAMP. The output voltage V0 is __________ V (rounded off to two decimal places). ...
Consider a four bit D to A converter. The analog value corresponding to digital signals of values 0000 and 0001 are 0 V and 0.0625 V respectively. The...
The number of comparators required in a 3-bit comparator type ADC is
The number of comparators in 4-bit flash ADC is
The resolution of a 4-bit counting ADC is 0.5 Volts. For an analog input of 6.6 Volts, the digital output of the ADC will be
The advantage of using a dual slope ADC in a digital voltmeter is that
For an ADC, match the following : if List 1 A. Flash converter B. Dual slope converter C. Successive approximation Converter List 2 1. require...
A 12-bit ADC is operating with a 1$$\mu$$ sec clock period and the total conversion time is seen to be 14 $$\mu$$ sec. The ADC must br of the
Match the List-1 (type of 8-bit ADC) with List-2(Minimum conversion time in clock cycles) List - 1 A. Successive approximation B. Dual-slope C...
Which of the resistance networks of figure can be used as 3 bit R-2R ladder DAC. Assume $${V_0}$$ corresponds to LSB. ...

## Marks 2

In an N bit flash ADC, the analog voltage is fed simultaneously to 2N− 1 comparators. The output of the comparators is then encoded to a binary format...
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 ...
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 ...
In the digital-to-Analog converter circuit shown in the figure below, $${V_{R\,}}\, = \,10V$$ and $$R\, = \,10k\Omega$$ The current i is...
In the digital-to-Analog converter circuit shown in the figure below, $${V_{R\,}}\, = \,10V$$ and $$R\, = \,10k\Omega$$ The voltage V0 is...
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 obse...
The circuit shown in figure is a 4-bit DAC The input bits 0 and 1 are represented by 0 and 5 V respectively. The OP- AMP is ideal, but all the resi...
For the 4 bit DAC shown in Figure, the output voltage $${V_0}$$ is ...
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