Q9Analog Circuits
Question
2 marks
What is the weighted register in DAC?
Answer
A Weighted Resistor DAC uses a network of resistors with binary-scaled values to convert digital bits into corresponding analog currents.
A Weighted Resistor Digital-to-Analog Converter (DAC) uses an array of resistors whose values are scaled in a binary fashion (e.g., ) connected to the inputs of an operational amplifier acting as a summing amplifier.
Each digital bit controls a switch connected to a resistor. The Most Significant Bit (MSB) connects to the smallest resistor () to supply the most current, while the LSB connects to the largest resistor, creating an analog output voltage proportional to the digital binary word.