![]() Now question is how it converts digital to analog signal? Since the resistance values are weighted in accordance with the binary weights of the digital inputs, this circuit is referred to as a w eighted-resistor D/A converter. It may be observed in the circuit diagram that different values of resistances are used at the digital inputs and the resistance values are the multiple of the resistance corresponding to the most significant digital input to produce the currents I, I/2, I/2 2, …. Finally then we get the produced voltage is analog in nature and will be proportional to the digital inputs. Farther this current can be converted to voltage with the help of a converter circuit by an using operational amplifier (OP AMP). Now the total current thus produced by that resistive network will be proportional to the digital inputs, which we want to convert in equivalent analog signal. Let us consider a N-bit straight binary resistor network, which produces a current I corresponding to logic 1 at the most significant bit, I/2 corresponding to logic 1 at the next lower bit, I/22 for the next lower bit and so on, and I/ 2N–1 for logic 1 at the least significant bit position. As we discuss earlier about how digital to analog converters works you may refer that first. By using simple resistor network we can easily build that. Weighted resistor digital to analog Converter is a very basic D/A converter.
0 Comments
Leave a Reply. |