Table of Contents
What is the use of Sigma Delta ADC?
Several applications for Delta-Sigma converters are included. Modern Sigma-delta converters offer high resolution, high integration, low power consumption, and low cost, making them a good ADC choice for applications such as process control, precision temperature measurements, and weighing scales.
What is the main advantage of Sigma Delta architecture?
Unlike other converter technologies, delta-sigma ADCs are free-running, meaning the input signal to the ADC is continuously being sampled even before a trigger condition happens. Moreover, because of the digital decimation filtering process, there is a delay before the input signal is converted to a digital sample.
Is Delta and Sigma the same?
They are all the same. Although Delta-Sigma may be “better” in that it reveals the the principle as hanjiemy mentioned, Sigma-Delta is widely accepted now.
Why it is called sigma Delta ADC?
One of the more advanced ADC technologies is the so-called delta-sigma, or ΔΣ (using the proper Greek letter notation). In a ΔΣ converter, the analog input voltage signal is connected to the input of an integrator, producing a voltage rate-of-change, or slope, at the output corresponding to input magnitude.
How does delta sigma modulation work?
The Delta-Sigma modulator pushes the noise to higher frequencies to increase the resolution of the ADC and performs the conversion of the analog input to a bit stream. The digital filtering and decimation stage are used to filter out the high-frequency noise and reduce the data rate to a usable amount.
Why it is called Sigma Delta ADC?
How do Delta Sigma ADCS work part 3?
Following the modulator in the delta-sigma ADC is a digital/decimator circuit. This circuit samples and filters the modulator stream of 1-bit codes. The digital-filter function operates at the same rate as the modulator sampling rate (Figure 1a). …
How do Delta-Sigma ADCS work part 3?
Why choose a SAR ADC instead of a sigma-delta ADC?
Designers often choose a classic SAR ADC instead, because they don’t understand the sigma-delta types. The analog side of a sigma-delta converter (a 1-bit ADC) is very simple. The digital side, which is what makes the sigma-delta ADC inexpensive to produce, is more complex.
What is the frequency range of a sigma delta ADC?
Sigma-delta ADCs typically have 16 to 24-bit resolution, with a usable input signal frequency range of a few Hz to a few kHz. There are some 16-bit sigma-delta ADCs with conversion rates up to 1 MSPS. A block diagram of a 16-bit sigma-delta converter appears in Figure 4-12.
What are the applications of delta-sigma converters?
Several applications for Delta-Sigma converters are included. Modern Sigma-delta converters offer high resolution, high integration, low power consumption, and low cost, making them a good ADC choice for applications such as process control, precision temperature measurements, and weighing scales.
How can we achieve noise shaping with Sigma-Delta modulators?
For higher orders of quantization, we can achieve noise shaping by including more than one stage of integration and summing in the sigma-delta modulator. For example, the second-order sigma-delta modulator of Figure 7 provides a 15dB improvement in SNR for every doubling of the sampling rate.