Contents
What does an analog comparator do?
The Analog Comparator is used to compare the voltage of two analog inputs, with a digital output indicating which input voltage is higher. Inputs can either be one of the selectable internal references or from external pins. The comparator output can be sent directly to GPIO or PRS.
What are the purposes of the comparator in the ADC?
A comparator is normally used in applications where some varying signal level is compared to a fixed level (usually a voltage reference). Since it is, in effect, a 1-bit analog-to-digital converter (ADC), the comparator is a basic element in all ADCs.
How many inputs are required for comparator?
Explanation: A comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. Thus, there are two inputs required for a digital comparator (i.e. A & B).
Why can a comparator be described as an analogue to digital converter?
A comparator is a device that compares two voltages (or currents) and outputs a digital signal indicating which is larger. It can then be considered to be a one bit analog to digital converter. A comparator consists of a specialized high-gain differential amplifier.
What is comparator used for?
A comparator circuit compares two voltages and outputs either a 1 (the voltage at the plus side; VDD in the illustration) or a 0 (the voltage at the negative side) to indicate which is larger. Comparators are often used, for example, to check whether an input has reached some predetermined value.
What is the output of an analog comparator?
The comparator has two analog inputs, one positive and one negative. When the comparator is active, the output indicates which of the two input voltages is higher. When the voltage on the positive input is higher than the negative input voltage, the digital output is high and vice versa.
How is an analog comparator used in GPIO?
1.1 Introduction. The Analog Comparator is used to compare the voltage of two analog inputs, with a digital output indicating which input voltage is higher. Inputs can either be one of the selectable internal references or from external pins. The comparator output can be sent directly to GPIO or PRS.
What is c1out in analog comparator 1 output bit?
C1OUT is the bit label assigned to the Comparator 1 output bit, which is tested using the if statement. The LED output is then switched accordingly. The pot sets the switching level, and a desk lamp or flashlight was found to work as a light source. The LED should go on when the light source goes off.
How to use the EFM32 analog comparator module?
Analog Comparator. AN0020 – Application Note. Introduction This application note describes how to use the EFM32 Analog Comparator Module to compare the voltage of two analog inputs, trigger interrupts or use two comparators for window mode.