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Digital-to-analog converter

A digital-to-analog converter, natural number technology, applied in the direction of digital-to-analog converter, analog/digital conversion, analog/digital/analog conversion, etc., can solve problems such as noise increase, reduce noise, save power consumption, static current reduced effect

Active Publication Date: 2018-10-23
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, in order to achieve the same output signal amplitude as the dual-variable switch structure, twice the quiescent current overhead is required, and the noise is also doubled

Method used

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Embodiment Construction

[0065] The technical solution in this application will be described below with reference to the accompanying drawings.

[0066] figure 1 is a schematic diagram of a system 10 suitable for the digital-to-analog converter of the embodiment of the present application. Such as figure 1 As shown, the system 10 includes: a digital baseband module (or called, a digital baseband processor (Digital Baseband Processor, DBP)) 11, an analog baseband module (or called, an analog baseband chip (Analog Baseband Chip, ABB)) 12, a radio frequency Front end (Radio Frequency Front End, RF FE) 13 and antenna (Antenna) 14 . Among them, DBP 11 receives data that needs to be communicated from the application processor, and obtains an orthogonal digital baseband in-phase / quadrature (Inphase / Quadrature, I / Q) signal after digital baseband processing, and the digital baseband I / Q signal is output to ABB 12. Through the digital-to-analog converter (DAC) in ABB 12, it will be combined later figure 2 ...

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Abstract

The present application provides a digital-to-analog converter capable of reducing quiescent current overhead and reducing static noise. The digital-to-analog converter comprises a first current source module, a first switch control module, and a transimpedance amplifier, wherein the first current source module is used for providing a current I1 for the digital-to-analog converter; the first switch control module is used for controlling turn-on or turn-off between each branch and a transimpedance amplifier in the digital-to-analog converter according to a to-be-converted digital signal; the current I1 provided by the first current source module flows into the transimpedance amplifier via a turned-on branch; and the transimpedance amplifier is used for converting the current I1 provided bythe first current source module into an analog voltage and outputting the analog voltage.

Description

technical field [0001] The present application relates to the field of circuits, and more particularly, to a digital-to-analog converter. Background technique [0002] Digital-to-analog converter (abbreviation, digital-to-analog converter, Digital Analog Converter, DAC) can convert discrete digital quantities into analog quantities with changing connections, and is a device widely used in computer, communication and other fields. [0003] In the current technology, in order to achieve a higher analog signal output bandwidth while meeting the requirements of low power consumption and small area, the digital-to-analog converter based on the current steering (Current Steering) structure has become the mainstream. [0004] The existing current steering structure is divided into two types: bilateral switch type and unilateral switch type. Among them, the double-sided switch structure has a large number of switches, and the mismatch of switch delays brings about deterioration of ...

Claims

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Application Information

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IPC IPC(8): H03M1/08H03M1/00H03M1/66
CPCH03M1/001H03M1/0845H03M1/66H03M1/08H03M1/742H03M1/765H03F3/45
Inventor 侯晨龙邸岳淼
Owner HUAWEI TECH CO LTD
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