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Did you know how the ΔΣ ADC cleverly removes unnecessary high-frequency noise?
In today's digital electronic technology, ΔΣ (Delta-sigma) modulation technology has gradually become one of the mainstream methods for converting analog signals into digital signals. The advantage of this technology lies in its high efficiency and stability, especially its ability to deal with high-frequency noise. Let us take a closer look at how this technology works wonders in eliminating unnecessary high-frequency noise.
ΔΣ modulation performs quantization through a negative feedback loop, which continuously corrects the quantization error and moves the quantization noise to a frequency higher than the original signal bandwidth.
Analog-to-digital converters (ADCs) using ΔΣ modulation technology mainly sample at high frequencies, then pass through digital filters for demodulation, and ultimately convert the signal into a high-bit digital output. This process shows the versatility of ΔΣ ADCs in real-world applications, not only handling the need to remove high-frequency noise, but also ensuring high accuracy of the signal.
Compared with traditional Nyquist rate ADCs, the oversampling technology used by ΔΣ ADCs greatly improves the timing accuracy of signals. This technology enables digital components to operate at high speeds, which is particularly important in high-precision electronic devices. Through oversampling, the collected signal can not only be obtained quickly, but also the unnecessary high-frequency noise can be effectively eliminated.The shape and distribution of the quantization noise allows Cancelar to minimize it within the frequency range of the fundamental frequency and then easily remove it with a low-pass filter.
ΔΣ modulation uses high-frequency pulse density modulation (PDM) to represent the signal, where the frequency change of each pulse corresponds to the intensity of the original analog signal. This makes regenerating the signal relatively simple, requiring only proper restoration of the timing and polarity of the pulses. In this process, the transmission system can greatly reduce signal distortion caused by environmental noise interference and maintain higher signal integrity.
Let’s dive into one of the key advantages of ΔΣ modulation, namely noise shaping. By using a high-order ΔΣ modulator, the noise can be redistributed in frequency, making high-frequency quantization noise easier to filter out than low-frequency signals. This not only improves the dynamic range of the signal, but also ensures a higher signal-to-noise ratio (SNR), which is particularly important in audio and data transmission systems.
Through noise shaping, the ΔΣ ADC can cleverly remove unnecessary high-frequency noise without affecting the integrity of the baseband signal.
Of course, ΔΣ ADCs are not limited to the audio field. They are also used in a variety of devices, from digital sound converters to high-efficiency power supply systems. The success of this technology continues to inspire engineers to explore its potential applications. In some advanced application scenarios, more and more products have begun to combine multi-bit or high-order ΔΣ modulators to improve the overall performance of the converter.
In the past, digital converters had to rely on complex analog filters to deal with the challenge of high-frequency noise, but now, advances in ΔΣ ADC technology have made this process extremely simple. This allows engineers to reduce the cost of finished products while improving overall performance, making high-quality audio and data communications a reality.
However, despite the many advantages of ΔΣ ADC, can we expect more advanced technologies to emerge in the future to further improve the quality and efficiency of digital signals?
