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How do I increase resolution in ADC?
The accuracy of a low-resolution ADC can be improved by oversampling the input signal using the ADC and subjecting it to low-pass filtering, using a FIR filter to filter out the quantization noise, and then decimating it.
How oversampling increase resolution?
Oversampling Description Oversampling is a cost-effective process of sampling the input signal at a much higher rate than the Nyquist frequency to increase the SNR and resolution (ENOB) that also relaxes the requirements on the antialiasing filter.
What is sinad in ADC?
The Signal-to-Noise Ratio and Distortion (SINAD) is measured with a sinusoidal input near full-scale applied to the ADC. The SINAD value is a useful measure of ADC performance because it includes the effect of all noise, distortion, and harmonics introduced by the ADC.
How can I increase the resolution of my ADC?
Higher ADC resolution implies higher-cost MCUs, but in some cases you can use other features in the MCU to enhance the ADC performance via software. That approach lets you achieve higher resolution using an inexpensive integrated ADC. Here’s how to use of oversampling to achieve extra bits of resolution for an ADC integrated in an MCU.
How is the oversampling frequency of an ADC calculated?
For each such additional bit, the signal must be oversampled by a factor of four: w is the number of additional bits of resolution desired, F s is the original sampling frequency required, and f os is the oversampling frequency. As an example, a 12-bit ADC can achieve:
Which is an example of a 16 bit ADC?
As an example, a 12-bit ADC can achieve: • 16-bit resolution with 256x oversampling (4 4 ). If we oversample an input signal at 16 F s , we collect enough samples within the required sampling period to average and produce 14 bits of output data, for a 14-bit measurement.
Is there a way to average ADC reads?
I’m working on a PIC32MX795F512L, I have the ADC working, but will like to do some averaging of the ADC reads. Reason is that when I send a request to read AN3 at the end of the conversion it also sends the result over the UART. But the results are not always consistent, I might have other issues too. Any input will be appreciated.