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Self-calibrating circuit of current source

A technology for calibrating circuits and calibrating currents, applied in the direction of analog/digital conversion calibration/testing, etc., can solve problems such as complex circuit structure and calibration process, achieve simple structure, realize two-way calibration, and simplify the calibration process.

Active Publication Date: 2013-03-13
NATIONZ TECH INC
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  • Abstract
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AI Technical Summary

Problems solved by technology

First of all, DAC digital calibration technology mostly uses a comparator to compare the current source and the reference current source, and realizes the compensation of the current source through successive calibrations. The circuit structure and calibration process are complicated.
At the same time, the above successive approximation digital calibration technology can only perform one-way calibration when the current value of the DAC current source is relatively small compared to the reference current source.

Method used

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  • Self-calibrating circuit of current source
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  • Self-calibrating circuit of current source

Examples

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Embodiment 2

[0033] In the second embodiment, the time sequence of the control signal for sampling switch tube opening and closing refers to Figure 4, E1 is the control signal of the sampling switches K1 and K2, E2 is the control signal of the sampling switches K3 and K4, and E3 is the control signal of the sampling switch K5. In this example, a high level is set to close the switch, and a low level is set to open the switch. Before the calibration circuit works normally, that is, within the time t1, E1 is at high level, E2 and E3 are at low level, and the first sampling switch K1 and the second sampling switch K2 are in the closed state, so that both ends of the sampling capacitor Cs are grounded, thereby Ensure that the charge on the capacitor is zero and prepare for sampling. At this time, the third sampling switch K3, the fourth sampling switch K4 and the fifth sampling switch K5 are all disconnected; at the sampling time of the calibration circuit, that is, within the time t2, E2 is ...

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Abstract

The invention discloses a self-calibrating circuit of a current source. By converting current errors into voltage errors, sampling the voltage errors and converting the voltage errors into figure signals for self-calibrating processing, the self-calibrating circuit combines the processing characteristics of existing simulation calibrating technology and figure calibrating technology, is simple in structure and can achieve bidirectional calibration.

Description

technical field [0001] The invention belongs to the technical field of digital-analog hybrid integrated circuits, and relates to a current source calibration circuit, in particular to a self-calibration circuit for current steering type digital-to-analog conversion. Background technique [0002] Digital-to-Analog Converter (DAC for short) is an important interface component with a wide range of uses in modern digital and analog circuits. In order to adapt to the rapid development of computer, communication and multimedia technology and the continuous acceleration of digitalization in high-tech fields, digital-to-analog converters are developing towards low power consumption, high speed and high resolution. [0003] In the current steering DAC circuit, the key to its performance is the output accuracy of the DAC current source and the matching between them. Due to the limitation of the CMOS process, if the current source achieves high matching at the process level, it needs ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/10
Inventor 庄奕琪汤华莲曹帆孙添平赵辉李勇强
Owner NATIONZ TECH INC
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