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Audio digital-to-analog converter

A digital-to-analog converter technology, applied in the field of audio digital-to-analog converters, can solve the problems of reducing the performance of the operational amplifier, increasing the output noise, insufficient working range, etc., and achieving the effects of improving the input range, saving area, and saving costs

Inactive Publication Date: 2013-05-01
ALI CORP
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Problems solved by technology

[0010] Although the aforementioned audio digital-to-analog converters 100 and 200 can solve the problems of insufficient input range of the operational amplifier and insufficient working range when the transistors of the front circuit operate in the saturation region under low-frequency operation, they will greatly reduce the performance of the operational amplifier. like adding output noise

Method used

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  • Audio digital-to-analog converter

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Embodiment Construction

[0021] Please refer to image 3 , image 3 It is a schematic diagram of a first embodiment of an audio digital-to-analog converter 300 of the present invention. like image 3 As shown, the audio DAC 300 includes an operational amplifier 310 , a first resistor-capacitor circuit 320 , a second resistor-capacitor circuit 330 and a current mirror circuit 340 . The operational amplifier 310 is a differential to single-ended (differential to single-ended) amplifier, which has a first input terminal 311, a second input terminal 312 and an output terminal 313, and the operational amplifier 310 is based on the first input terminal 311 The first input signal S IN1 ’ and the second input signal S of the second input terminal 312 IN2 ’ to output an output voltage V OUT '. The first resistor-capacitor circuit 320 and the second resistor-capacitor circuit 330 each include a resistor R1 and a capacitor C connected in parallel, wherein the first resistor-capacitor circuit 320 is coupled...

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Abstract

The invention provides an audio digital-to-analog converter (audio DAC). The audio DAC comprises an operation amplifier, a first resistance-capacitance circuit, a second resistance-capacitance circuit and a current mirror circuit, wherein the operation amplifier outputs an output voltage to an output end according to a first input signal and a second input signal of first and second input ends; the first resistance-capacitance circuit is coupled between the first input end and the output end of the operation amplifier; the second resistance-capacitance circuit is coupled between the second input end of the operation amplifier and a common-mode voltage; and a first current mirror path of the current mirror circuit is coupled to the second input end of the operation amplifier, while a second current mirror path is coupled to the first input end of the operation amplifier.

Description

technical field [0001] The present invention relates to an audio digital-to-analog converter (Audio DAC), especially an audio digital-to-analog converter that improves the input range of its internal operational amplifier and improves performance by adding a current mirror circuit. Background technique [0002] Digital-to-analog Converter (DAC) is an indispensable circuit component in today's communication system, and there are quite a few types. Generally speaking, the current-controlled digital-to-analog converter (Current-Steering Digital- to-analog Converter) is a relatively common and high-speed digital-to-analog converter. Its basic concept is to use a current source to switch the required current to the output terminal through switch control. However, with the development of semiconductor technology, the supply voltage (Supply voltage, Vdd) continues to drop, causing the voltage working range of the transistor to become narrower and narrower, so that the transistor wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
Inventor 许钧程
Owner ALI CORP
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