Analog-to-Digital Conversion › lesson 39 of 100 · Intermediate
Explain Sigma-Delta ADC Principles
This lesson is part of the Analog-to-Digital Conversion course and will teach the principles of Sigma-Delta ADCs. After this lesson, the learner will be able to explain the principles of Sigma-Delta ADCs and noise shaping.
Sigma-Delta ADCs use noise shaping to achieve high resolution by pushing the noise to higher frequencies.
In a real-world audio application, a Sigma-Delta ADC is used to convert the analog audio signal to a digital signal. This is achieved through the use of oversampling, where the analog signal is sampled at a much higher rate than the Nyquist rate, and noise shaping, where the noise is pushed to higher frequencies. The sigma-delta modulator is the key component in this process, which converts the analog signal to a digital signal and shapes the noise.
The sigma-delta modulator consists of an integrator, a quantizer, and a feedback loop. The integrator integrates the analog signal, and the quantizer converts the integrated signal to a digital signal. The feedback loop then subtracts the digital signal from the integrated signal, which shapes the noise.
The noise shaping process is achieved through the use of a high-pass filter, which pushes the noise to higher frequencies. This allows the Sigma-Delta ADC to achieve high resolution and accuracy, even in the presence of noise.
উদাহরণ
- Audio equipmentSigma-Delta ADCs are commonly used in audio equipment, such as CD players and digital audio workstations.
- Medical devicesSigma-Delta ADCs are used in medical devices, such as ECG and EEG machines, to convert analog signals to digital signals.
- Industrial control systemsSigma-Delta ADCs are used in industrial control systems to convert analog signals from sensors to digital signals.
পূর্ণ কোর্স প্রতিটি পাঠ 5টি প্রশ্ন দিয়ে যাচাই করে, আপনার স্তরের সঙ্গে মানিয়ে নেয় এবং আপনার জায়গা মনে রাখে।