DAC Instance Downside
Within the earlier chapter, we mentioned the 2 forms of DACs. This chapter discusses an instance downside based mostly on R-2R ladder DAC.
Allow us to discover the worth of analog output voltage of R-2R Ladder DAC for a binary enter,= 100.
Circuit Diagram and its Simplification
The circuit diagram of a 3-bit R-2R Ladder DAC when binary enter,= 100 utilized to it’s proven within the following determine −
Within the above circuit, there exists sequence and parallel combos of resistors to the left of level A with respect to floor. So, we are able to substitute that whole resistor community with a single resistor having resistance of.
The simplified circuit diagram is proven within the following determine −
We are able to substitute the a part of the community that’s linked to the left of level B with respect to floor through the use of a Thevenin’s equal circuit. The modified circuit diagram is proven within the following determine −
Within the above circuit, there exist a sequence mixture of two resistors. Exchange this mixture with a single resistor. The ultimate circuit diagram after simplification is proven within the following determine −
Now, the above circuit diagram appears like an inverting amplifier. It’s having an enter voltage ofvolts, enter resistance of and suggestions resistance of .
The output voltage of the circuit proven above will probably be −
Due to this fact, the output voltage of 3-bit R-2R Ladder DAC isvolts for a binary enter, = 100.