DAC and ADC Basics

What is the main principle behind a weighted resistor DAC?

• The output voltage is not dependent on the digital input

• Each bit in the digital input corresponds to a capacitor of a specific weight

• The digital input is directly converted to an analog output without any weighting

• Each bit in the digital input corresponds to a resistor of a specific weight.

How does an R-2R ladder DAC work?

• An R-2R ladder DAC converts analog input signal to a digital output voltage

• An R-2R ladder DAC uses a network of capacitors instead of resistors

• An R-2R ladder DAC works by directly converting digital input to analog output without any components

• An R-2R ladder DAC converts a digital input signal to an analog output voltage by using a network of resistors in a ladder configuration.

Explain the operation of a single slope ADC.

• A single slope ADC samples the input voltage at random intervals resulting in inaccurate readings.

• In a single slope ADC, the reference voltage is adjusted continuously to match the input voltage.

• The output of a single slope ADC is determined by the frequency of the input signal rather than the voltage level.

• A single slope ADC integrates the input voltage for a fixed time period and then compares it to a reference voltage to determine the digital output.

What is the difference between a dual slope ADC and a single slope ADC?

• The difference lies in the color of the components used

• Single slope ADCs are digital while dual slope ADCs are analog

• A dual slope ADC is faster than a single slope ADC

• The difference is in the number of slopes used for integration.

Describe the working principle of a successive approximation ADC.

• Successive approximation ADC determines the digital output by converting the input voltage to frequency

• Successive approximation ADC determines the digital output by comparing the input voltage to the reference voltage directly

• Successive approximation ADC determines the digital output by randomly selecting bits to approximate the input voltage

• Successive approximation ADC determines the digital output by successively approximating the input voltage by comparing it to a fraction of the reference voltage, starting with the MSB and proceeding to the LSB in a binary search process.

In what way does a flash ADC differ from other types of ADCs?

• Flash ADC requires a DAC for conversion

• Flash ADC directly converts analog input to digital output using comparators, without intermediate steps.

• Flash ADC uses a counter to convert analog input

• Flash ADC converts digital input to analog output

What is the purpose of using weighted resistors in a DAC?

• To decrease the accuracy of the DAC

• To simplify the circuit design of the DAC

• To increase the power consumption of the DAC

• To provide different voltage levels corresponding to different digital input values

Why is an R-2R ladder network commonly used in DACs?

• It provides a simple and cost-effective way to convert digital signals to analog voltages.

• It increases the complexity of the circuit

• It requires additional power sources

• It reduces the accuracy of the DAC

What is the significance of the reference voltage in an ADC?

• The reference voltage in an ADC is only relevant for analog signals below a certain threshold.

• The reference voltage in an ADC is used to determine the input impedance of the system.

• The reference voltage in an ADC is crucial for setting the maximum value that can be represented by the ADC and enabling accurate conversion of analog signals to digital values.

• The reference voltage in an ADC has no impact on the accuracy of the conversion process.

How does a dual slope ADC achieve higher resolution compared to other ADCs?

• By using a single time period for both charging and discharging

• By measuring the input voltage continuously without any breaks

• By integrating the input voltage over two different time periods: one for charging and one for discharging.

• By converting the input voltage directly into a digital signal without any intermediate steps