Signal converting apparatus for integrating analog-to-digital converter and digital-to-analog converter and integration unit

Abstract

A signal converting apparatus for integrating an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC) and an integration unit thereof are provided. The present invention integrates ADC and DAC, that do not operate simultaneously, into a signal converting apparatus (SCA), wherein a control signal decides whether an analog-to-digital mode or a digital-to-analog mode is selected. By sharing the operational amplifiers and other components in the SCA, the chip area and the cost are significantly reduced. In addition, in the integration unit, by switching a plurality of capacitor sets with various capacitances, the capacitance coefficients required for switching ADC and DAC are obtained.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the priority benefit of Taiwan application serial no. 94116050, filed on May 18, 2005. All disclosure of the Taiwan application is incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of Invention [0003] The present invention relates to a signal converting apparatus (SCA) between an analog signal and a digital signal, and particularly to a signal converting apparatus (SCA) for integrating an analog-to-digital converter (ADC) and a digital-to analog converter (DAC) and an integration unit thereof. [0004] 2. Description of the Related Art [0005]FIG. 1 is a block diagram showing a conventional processing structure of analog and digital signals. In general, an ADC 110 and a DAC 130 are two independent analog circuits designed separately. For converting an analog signal A1 into a digital signal D1, the analog signal A1 should be converted into a digital signal D1 by the ADC 110 first, then sent...

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide a signal converting apparatus (SCA) for integrating ADC and DAC, which do not operate simultaneously, into a common circuit, wherein a control signal decides whether an analog-to-digital mode or a digital-to-analog mode is selected. By sharing the operational amplifiers and other components in the SCA, the chip area and the cost are significantly reduced.

[0013] Since ADC and DAC, which do not operate simultaneously, are integrated into a common circuit and a control signal decides whether an analog-to-digital mode or a digital-to-analog mode is selected in the present invention, the operational amplifiers and other components can be shared and the chip area and the production cost is significantly reduced. In addition, the present invention provides an integration unit, by which capacitance coefficient required for the analog-to-digital mode or the digital-to-analog mode are obtained by switching a plurality of capacitor sets with various capacitance ratios.

Problems solved by technology

In real practice, however, there is little chance to conduct signal converting of both ADC and DAC simultaneously.

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