Switch current unit and its array used for current rudder type D/A converter

A digital-to-analog converter, switching current technology, applied in the direction of digital-to-analog converter, physical parameter compensation/prevention, etc., can solve problems such as large output noise

Active Publication Date: 2012-05-09
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the defect that the output noise of the existing digital-to-analog converter is relatively large, the present invention provides a switching current unit and an array thereof applied to a current-steering digital-to-analog converter

Method used

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  • Switch current unit and its array used for current rudder type D/A converter
  • Switch current unit and its array used for current rudder type D/A converter
  • Switch current unit and its array used for current rudder type D/A converter

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Embodiment Construction

[0024] The switching current unit provided by the present invention is as Figure 4 As shown, the main difference with the prior art is that three gates are added, NOR gate (4), NOR gate (5) and inverter (6), wherein the control terminal of switch SD (2) is connected to the inverter The input ends of the phaser (1) are connected, the output end of the inverter (1) is connected with one end of the switch SO (3), the input end of the inverter (1) is connected with the output end of the NOR gate (4) , the two input ends of the NOR gate (4) are respectively connected with the output end of the NOR gate (5) and the output end of the inverter (6). . Its specific working principle is as follows:

[0025] When the input terminal COL ("column") is at a logic low level, the switch SO(3) is turned off and the switch SD(2) is turned on at the same time, the current Isic will flow to the DMP terminal through the switch SD(2).

[0026] When the input terminal COL is logic high, the flow ...

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Abstract

The invention provides a switching current unit for a current steering D / A converter, which consists of a power supply, a current supply Isic, a first inverter (1), a switch SO (3), a switch SD (2), a second inverter (6), a first NOR gate (4) and a second NOR gate (5), wherein, one end of the current supply Isic is connected with the power supply, one ends of the switch SD (2) and the switch SO(3) are commonly connected with the other end of the current supply Isic; the control end of the switch SO (3) is connected with the output end of the first inverter (1); the control end of the switch SD (2) is connected with the input end of the first inverter (1); the input end of the first inverter (1) is connected with the output end of the first NOR gate (4); two input ends of the first NOR gate (4) are respectively connected with the output end of the second NOR gate (5) and the output end of the second inverter (6). The D / A converter provided by the invention is of smooth output curve, and small interference caused by the injection of an electric charge.

Description

technical field [0001] The invention relates to the field of digital-to-analog converters, in particular to a switching current unit and an array thereof applied to a current-steering digital-to-analog converter. Background technique [0002] The design types of digital-to-analog converters include delta-sigma type, R-2R type, resistor string type, current steering type, etc., and they are different in circuit complexity, operating speed, power consumption, and chip area. Among them, the current-steering digital-analog converter is widely used in high-speed circuits with high matching requirements, and the energy utilization rate of the current-steering digital-analog converter is relatively high. When the output signal is differentially utilized, it can almost output all energy. In the process of converting digital signals into analog signals, the static and dynamic performance of the current steering digital-to-analog converter mainly depends on the switching current unit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/08H03M1/66
Inventor 秦义寿陈晓杰
Owner STATE GRID CORP OF CHINA
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