Low power sigma-delta modulator architecture capable of correcting dynamic range automatically, method for implementing low power circuit thereof, and method for correcting and extending dynamic range of sigma-delta modulator automatically

Abstract

A low power consumption sigma-delta modulator architecture capable of dynamic detection of output signal strength to change dynamic range, a method for implementing low power consumption circuit thereof, and a method for automatically correcting and extending dynamic range of the sigma-delta modulator are provided. An automatic correction unit is utilized to detect system output signal strength of the sigma-delta modulator, compare system input signal specifications to come out multiple sets of dynamic range curves, and thereby extract an appropriate combination of system order and feed-forward coefficients so as to extend the system dynamic range. The circuit architecture of the automatic correction unit is in a digital circuit form, including a digital signal processor, a counter and register array, a comparator, a digital coefficient controller, a feed-forward gain control unit and a system order control unit.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Republic of Taiwan Patent Application No. 104136086 filed on Nov. 2, 2015, in the State Intellectual Property Office of the R.O.C., the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]Field of the Invention[0003]The invention relates to a sigma-delta modulator architecture and a method for implementing the same, more specifically to a sigma-delta modulator architecture capable of both low power consumption performance and dynamic range extension, and a method for implementing the same.[0004]Descriptions of the Related Art[0005]In recent years, with evolutions of integrated circuit designs and process technologies, the application scope of sigma-delta modulators gets wider and wider. Applications of sigma-delta modulators are ranged widely from audio signal processing circuits, such as walkman, sounder and hearing aid for medical use, to biomedical instrument,...

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Benefits of technology

[0023]The purposes, subject matters, features and the achieved effects of the invention would be understood more readily by means of the following detailed description in conjunction with attached drawings.

Problems solved by technology

For example, multiple feedback architecture in combination with feedforward path and local feedback are design methods used frequently for increasing dynamic range, such that circuit area and power consumption are increased significantly.

However, much time is consumed and design cost is increased indirectly in the design process accordingly.

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