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Complementary current circuit, switch circuit and current digital-to-analog converter of foreground correction

A digital-to-analog converter and current circuit technology, which is applied in the field of switching circuits, current-mode digital-to-analog converters, and complementary current circuits, can solve the problems of capacitive components, deterioration of output impedance, and limited SFDR improvement, and improve linearity , Static matching performance is improved, and the effect of ensuring high-frequency output impedance

Active Publication Date: 2015-11-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the output impedance is a finite value and there is a capacitive component in the output impedance due to the influence of parasitic capacitance, the output impedance is further deteriorated at high frequencies
In order to improve the output impedance, C.H-Lin et al proposed in the 2009 International Solid State Circuit Conference (ISSC2009) to increase the output impedance by adding small current branches, but limited by the principle, the improvement of SFDR is limited

Method used

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  • Complementary current circuit, switch circuit and current digital-to-analog converter of foreground correction
  • Complementary current circuit, switch circuit and current digital-to-analog converter of foreground correction
  • Complementary current circuit, switch circuit and current digital-to-analog converter of foreground correction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as image 3 As shown, the complementary current circuit corrected in the foreground of this embodiment has a first current output terminal and a second current output terminal, and the constituent modules include: an adjustable complementary current generation module, reference current sources I5 and I6, a current magnitude comparator, Correction control unit, and a group of switches S3, S4, S5, S6, wherein, the adjustable complementary current generation module, under the control of the input control signal, generates two sets of corresponding output currents, one set outputs from its output terminal one to node X1, and another group is output from its output terminal two to node X2.

[0048] One end of the switch S3 is connected to the node X1, and the other end of S3 is connected to the first current output end; one end of the switch S4 is connected to the node X2, and the other end of S4 is connected to the second current output end.

[0049] One end of switch...

Embodiment 2

[0055] Such as Figure 4 As shown, the complementary current circuit of the foreground correction function of this embodiment is similar to the first embodiment, the difference is that the adjustable complementary current generating module is composed of a sub-digital-to-analog converter, a current source I3 and a current source I4, and:

[0056] One ends of current sources I3 and I4 are respectively connected to fixed potential three and fixed potential four, and the other ends of I3 and I4 are respectively connected to output end one and output end two of the complementary current generating module.

[0057] The sub-digital-to-analog converter receives the input control signal of the adjustable complementary current generating module, generates a corresponding current and outputs it to the output terminal one of the adjustable complementary current generating module. In this way, the correction of the differential output current of the complementary current unit is realized....

Embodiment 3

[0064] Such as Figure 6 As shown, the current-mode digital-to-analog converter corrected in the foreground of this embodiment, its input includes a set of digital signals, and the components of the current-mode digital-to-analog converter include a decoder and a switch current array, wherein:

[0065] Each unit of the switch current array is a switch current circuit, and each unit includes at least one current source and at least one pair of switches whose control signals are opposite to each other; and in the switch current array, at least one unit is as in the embodiment Three of the complementary current switching circuits.

[0066] The decoder converts the digital input signal of the current-mode digital-to-analog converter into several groups of anti-phase differential control signals to control the switch current circuits in the switch current array.

[0067] Due to the existence of the foreground corrected complementary switch circuit, the deviation of the differentia...

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Abstract

The invention discloses a complementary current circuit, a switch circuit and a current digital-to-analog converter of foreground correction. The complementary current circuit comprises a current intensity comparator, a correction control unit, a to-be-corrected complementary current branch and corresponding current sources thereof, a reference current source, a switch module and a plurality of control signal generation units, wherein the current intensity comparator, under control of the correction control unit and the switch module, compares current intensity of two current sources in the to-be-corrected complementary current branch through the reference current source, and sends the comparison result to the correction control unit for further regulating the to-be-corrected current source to output current. The invention has the advantages of high correction accuracy of the complementary current, simple circuit structure and fast running speed.

Description

technical field [0001] The invention relates to the technical field of digital-to-analog conversion circuits, in particular to a complementary current circuit for foreground correction, a switch circuit and a current-type digital-to-analog converter. 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 increasing amount of information in modern communications, higher speeds of digital-to-analog converters are required. At the same time, due to the multiplexing of the spectrum, the spectrum range of the signals that exist simultaneously in a single channel is wider. In order to reduce the interference of signals in different frequency bands and reduce the interference of harmonics introduced by nonlinearity, the digital-to-analog converter is required to have higher linearity. Spend. The linearity of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/66
Inventor 李学清杨华中赖龙强魏琦刘嘉男
Owner TSINGHUA UNIV