Sigma Delta Sampling

1. How does Sigma-Delta work?
2. How do you calculate delta-sigma?
3. What is Sigma-Delta filter?
4. What is the main advantage of Sigma-Delta architecture?

How does Sigma-Delta work?

This is the delta-sigma concept in action: the first comparator senses a difference (Δ) between the integrator output and zero volts. The integrator sums (Σ) the comparator's output with the analog input signal. Functionally, this results in a serial stream of bits output by the flip-flop.

How do you calculate delta-sigma?

A delta-sigma or other pulse-density or pulse-frequency modulator generates a pulse stream in which the frequency, f, of pulses in the stream is proportional to the analog voltage input, v, so that f = k · v, where k is a constant for the particular implementation.

What is Sigma-Delta filter?

Basically, a sigma-delta converter digitizes an analog signal with a very low resolution (1 bit) ADC at a very high sampling rate. By using oversampling techniques in conjunction with noise shaping and digital filtering, the effective resolution is increased.

What is the main advantage of Sigma-Delta architecture?

Delta-sigma ADCs implement oversampling, decimation filtering, and quantization noise shaping to achieve high resolution and excellent antialiasing filtering.