Digtal to analog conversion

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Digital Signal Conditioning Lab

  1. For the comparator below, complete the design so that the threshold voltage is 1.25V which means that if the input is below 1.25V, the output will be HIGH and if its greater, it will be low. Once the resistance values are found, use Multisim to validate the design by applying a sine wave of 3Vpp into Vin and plot the results.

 

  1. Using the 8 bit Digital-to-Analog (VDAC) in Multisim, design the part with a 12V reference. Next apply the following inputs in the table below and both calculate and measure the output voltage. What is the resolution of the DAC? Show your circuit and results in Multisim.

Digital Inputs

Calculated Analog Output Voltage

Measured Analog Output Voltage

7

6

5

4

3

2

1

0

0

0

0

0

0

0

0

1

 

 

0

0

0

0

1

0

0

1

 

 

0

0

0

1

0

0

0

0

 

 

0

0

0

1

1

1

1

1

 

 

0

1

0

1

0

1

0

1

 

 

1

0

0

0

0

0

0

0

 

 

1

1

1

1

1

1

1

1

 

 

 

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