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Complementary current circuit, switch circuit and current-mode digital-to-analog converter for background correction

A digital-to-analog converter, current circuit technology, applied in the direction of digital-to-analog converter, analog/digital conversion calibration/test, etc., can solve the problems of limited SFDR improvement, existence of capacitive components, output impedance deterioration, etc., to ensure high-frequency Output impedance, improve linearity, alleviate the effect of reducing output impedance

Active Publication Date: 2018-04-20
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-mode digital-to-analog converter for background correction
  • Complementary current circuit, switch circuit and current-mode digital-to-analog converter for background correction
  • Complementary current circuit, switch circuit and current-mode digital-to-analog converter for background correction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as image 3 As shown, the complementary current circuit with background correction function of this embodiment has a first current output terminal and a second current output terminal. The components include: standby current sources I1 and I2, an adjustable complementary current generation module, and a reference current source I5 and I6, current magnitude comparator, correction control unit, and a set of switches S1, S2, S3, S4, S5, S6. among them:

[0045] One end of the standby current source I1 is connected to the fixed potential one, the other end of I1 is connected to the switch S1, and the other end of S1 is connected to the first current output terminal; one end of the standby current source I2 is connected to the fixed potential two, and the other end of I2 is connected to the switch S2 Connected, the other end of S2 is connected to the second current output end.

[0046] The adjustable complementary current generation module, under the control of the input co...

Embodiment 2

[0054] Such as Figure 4 As shown, the complementary current circuit for background correction of this embodiment is similar to Embodiment 1, except that the adjustable complementary current generation module is composed of a sub-digital-to-analog converter, current source I3 and current source I4, and:

[0055] One ends of the current sources I3 and I4 are respectively connected to the fixed potential three and the fixed potential four, and the other ends of the current sources I3 and I4 are respectively connected to the first current extraction terminal and the second current extraction terminal of the complementary current generating module.

[0056] The sub-digital-analog converter receives the input control signal of the adjustable complementary current generating module, generates a corresponding current and outputs it to the first current extraction terminal of the adjustable complementary current generating module. So as to realize the correction of the differential output c...

Embodiment 3

[0063] Such as Image 6 As shown, the input of the current-type digital-to-analog converter for background correction in this embodiment includes a set of digital signals. The component modules of the current-type digital-to-analog converter include a decoder and a switch current array, in which:

[0064] Each unit of the switched current array is a switched current circuit, and each unit includes at least one current source and at least a pair of switches whose control signals are opposite to each other; and in the switched current array, at least one unit is as in the embodiment 3. The complementary current switching circuit.

[0065] The decoder converts the digital input signal of the current-type digital-to-analog converter into several groups of inverted differential control signals to control the switch current circuit in the switch current array.

[0066] Due to the existence of the complementary switching circuit corrected in the background, the deviation of the differential...

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PUM

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Abstract

The invention discloses a background corrected complementary current circuit, a switching circuit and a current-mode digital analog converter. The complementary current circuit comprises a current flow comparator, a correction control unit, a complementary current branch circuit to be corrected, a current source corresponding to the complementary current branch circuit to be corrected, a reference current source, a switching module, a plurality of control signal generation units and a spare current source, wherein the current flow comparator compares current flows of two current sources in the complementary current branch circuit to be corrected through the reference current source under the control of the correction control unit and the switching module; and a comparison result is sent to the correction control unit, so that the output current of the current source to be corrected is further adjusted. The background corrected complementary current circuit, the switching circuit and the current-mode digital analog converter disclosed by the invention have the advantages that: the correction precision of complementary current is high; the circuit is simple in structure; and the operation speed is rapid.

Description

Technical field [0001] The invention relates to the technical field of digital-to-analog conversion circuits, and in particular to a complementary current circuit with a correction function, a switch circuit and a current-type digital-to-analog converter. Background technique [0002] The digital-to-analog converter (DAC), as an important bridge between the digital domain and the analog domain, plays an important role in the signal processing and communication fields. With the increase in the 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 signal that exists at the same time in a single channel is wider. In order to reduce the interference of signals in different frequency bands, and at the same time reduce the interference of harmonics introduced by nonlinearity, the digital-to-analog converter is required to have higher linearity. deg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10H03M1/66
Inventor 李学清杨华中赖龙强魏琦刘嘉男
Owner TSINGHUA UNIV