Question

How does a dual-slope ADC function?

Answer 1

To delve into the functioning of a dual-slope ADC (Analog-to-Digital Converter), it ultimately operates through a two-phase process. First, it integrates the input voltage over a fixed period using a capacitor, which ramps up the voltage. Then, it discharges that capacitor at a known reference voltage until it returns to zero. The time taken for this discharge is measured and is directly proportional to the input voltage. This time measurement is what gets converted into a digital value, providing a precise representation of the input signal. The dual-slope method is particularly advantageous for its noise rejection capabilities and accuracy in measurements. Would you like more details on any specific aspect?

Answer 2

To delve into the workings of a dual-slope ADC, it essentially measures an input voltage by integrating it over a fixed period and then de-integrating it with a reference voltage. The process involves two main phases:

1. **Integration Phase**: The input voltage is integrated (accumulated) over a specific time interval, creating a ramp-up of the voltage across a capacitor.

2. **De-integration Phase**: After the integration period, the capacitor is then de-integrated using a reference voltage of opposite polarity until the capacitor's voltage returns to zero. The time required to reach zero is proportional to the input voltage.

The ultimate result, which is the time duration of the de-integration phase, is then converted into a digital value, representing the input voltage.