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A switch current device and a digital-to-analog converter based on the device

A digital-to-analog converter and switching current technology, which is applied in the field of digital-to-analog converter circuits and switching current devices, can solve the problems of differential current deviation and other problems, and achieve the effect of reducing errors and suppressing mismatching

Active Publication Date: 2019-10-18
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, due to the mismatch of the switching unit used to control the output, when the difference between the two current sources in the complementary structure is the theoretical difference, the actual output differential current still has a deviation

Method used

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  • A switch current device and a digital-to-analog converter based on the device
  • A switch current device and a digital-to-analog converter based on the device
  • A switch current device and a digital-to-analog converter based on the device

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Embodiment Construction

[0066] In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0067] Figure 5 A schematic structural diagram of a switching current device provided in an embodiment of the present invention, refer to Figure 5 , the switch current device includes: a complementary current switch module to be corrected and a correction circuit module;

[0068] The correction circuit module includes: a comparator, a co...

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Abstract

The invention discloses a switching current device and a digital-analog converter based on the same. The device comprises a complementary current switch module to be corrected and a correction circuit module. The correction circuit module comprises a comparator, a correction control unit and differential switch gating control unit. The complementary current switch module comprises a sub-digital-to-analog converter, a first current source, a second current source, a first switch unit and a second switch unit. The comparator is connected with the output end of the complementary current switch module to be corrected and the correction control unit. The correction control unit is connected with the sub-digital-to-analog converter and the differential switch gating control unit. The differential switch gating control unit is connected with the first switch unit and the second switch unit. The first switch unit is connected between the first current source and an output end; and the second switch unit is connected between the second current source and the output end. By suppressing mismatch introduced by the switch units, errors of output current can be reduced fundamentally.

Description

technical field [0001] The invention relates to the technical field of digital-to-analog converter circuits, in particular to a switching current device and a digital-to-analog converter based on the device. Background technique [0002] As an important bridge between the digital domain and the analog domain, the digital-to-analog converter (DAC) plays an important role in the field of signal processing and communication. With the increase in the amount of information in modern communications, there are higher requirements for the speed of digital-to-analog converters. At the same time, due to the multiplexing of the spectrum, the spectrum range of the signal existing in a single channel is wider. In order to reduce the interference of signals in different frequency bands and the interference of harmonics introduced by nonlinearity, the digital-to-analog converter is required to have higher linearity. Spend. The linearity of a DAC is usually described in terms of spurious-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
Inventor 赖龙强杨华中李学清魏琦刘嘉男
Owner TSINGHUA UNIV
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