How does oversampling improve ADC resolution?
Oversampling Description As a general guideline, oversampling the ADC by a factor of four provides one additional bit of resolution, or a 6 dB increase in dynamic range. Increasing the oversampling ratio (OSR) results in overall reduced noise and the DR improvement due to oversampling is ΔDR = 10log10 (OSR) in dB.
Does oversampling increase resolution?
Oversampling is capable of improving resolution and signal-to-noise ratio, and can be helpful in avoiding aliasing and phase distortion by relaxing anti-aliasing filter performance requirements.
How can I improve my ADC accuracy?
To minimize the ADC errors related to the external environment, take care of the reference voltage and power supply, eliminate the analog-input signal noise, match the ADC dynamic range to the maximum signal amplitude, and match analog-source resistance.
Is more oversampling better?
Higher oversampling rates ease the burden of the filter design which would otherwise require very steep slopes to be effective in reducing aliasing.
What are the advantages and disadvantages of oversampling?
The advantage of oversampling is that no information from the original training set is lost since we keep all members from the minority and majority classes. However, the disadvantage is that we greatly increase the size of the training set.
How do I increase my ADC range?
Placing a resistor in series with the ADC input will increase the voltage range for the ADC. The extended range can be calculated using the voltage divider equation (see Equation 4). This equation is used in an example where the ADS8688 input range is expanded from ±10.24V to ±12.288V (see Equation 5).
What is the disadvantage of oversampling?
The main disadvantage with oversampling, from our perspective, is that by making exact copies of existing examples, it makes overfitting likely. In fact, with oversampling it is quite common for a learner to generate a classification rule to cover a single, replicated, example.
What is the problem of oversampling?
the random oversampling may increase the likelihood of occurring overfitting, since it makes exact copies of the minority class examples. In this way, a symbolic classifier, for instance, might construct rules that are apparently accurate, but actually cover one replicated example.
How the resolution of an ADC depends on?
The ADC resolution depends upon the number of bits used to represent the digit number. As the number of bits increases the resolution of an Analog to Digital Converter improves and the quantization error decreases.
When should I use oversampling?
If you value reducing clipping distortion, aliasing distortion, and to a lesser extent, lowering quantization distortion, you should definitely use oversampling. Additionally, if you want to have accurate analog emulation without the negative impact of digital sounding aliasing distortion, use oversampling.
What is the downside to oversampling?
Why do you need oversampling?
Oversampling is the practice of selecting respondents so that some groups make up a larger share of the survey sample than they do in the population. Oversampling small groups can be difficult and costly, but it allows polls to shed light on groups that would otherwise be too small to report on.
How is oversampling applied to embedded ADCs?
The oversampling approach can be applied to just about any MCU with an embedded ADC, so to see exactly how it’s done, we use a 16-bit RISC-based MCU (Maxim’s MAXQ2010) to demonstrate the averaging and oversampling control. The MAXQ2010 incorporates a 12-bit, 312-ksps ADC with 1 LSB of INL and DNL.
Why do we need to increase the resolution of ADC?
Increasing the Resolution of an ADC Measurement Many applications measure a large dynamic range of values, yet require fine resolution to measure small changes in a parameter. For example, an ADC may measure a large temperature range, yet still require the system to respond to changes of less than one degree.
What are the advantages of oversampling a SAR ADC?
Besides oversampling with a Δ-Σ ADC, oversampling a high throughput SAR ADC can improve antialiasing and reduce overall noise. In many cases, oversampling is inherently used and implemented well in Δ-Σ ADCs with an integrated digital filter and decimation functionality.
What is the sampling rate of the ADC?
// // The ADC is configured to look at the on-chip temp sensor. The sampling // rate of the ADC is determined by the constant , which is given // in Hz. The maximum value of is limited to ~86kHz due to // the choice of 18.432MHz crystal (SAR clock = SYSCLK / 16 = 1.152MHz.