An Overview of Sigma-Delta Converters - IEEE Signal Processing Magazine
نویسنده
چکیده
A lthough real world signals are analog, it is often desirable to convert them into the digital domain .using an analog to digital converter (ADC). Motivating designers to apply this conversion is the efficient transmission and storage of digital signals. Digital representation of an audio signal, for example, allows CD players to achieve virtually error free storage using optical disks [l]. Intricate processing of the signal may also necessitate analog to digital (AD) conversion, since such processing is only feasible in the digital domain using either conventional digital computers or special purpose digital signal processors (DSPs). Signal processing in the digital domain is also extremely useful in such areas as biomedical applications, providing the needed accuracy for tasks such as ultrasound imaging. One technique, sigma-delta modulation, has become quite popular for achieving high resolution. One significant advantage of the method is that analog signals are converted using only a 1-bit ADC and analog signal processing circuits having a precision that is usually much less than the resolution of the overall converter. Converters
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