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digital to analog converter dac and its calibration circuit

A digital-to-analog converter and calibration circuit technology, applied in the direction of analog/digital conversion calibration/testing, can solve problems such as difficult to achieve high-precision high-speed DAC, matching errors, etc.

Active Publication Date: 2017-06-27
ETOWNIP MICROELECTRONICS BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. R1 and R2 themselves have matching errors;
[0006] 2. The DC offset of the comparator itself (DC offset)
[0007] The above defects make it difficult to realize high-precision high-speed DAC

Method used

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  • digital to analog converter dac and its calibration circuit
  • digital to analog converter dac and its calibration circuit
  • digital to analog converter dac and its calibration circuit

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0021] In view of the problems existing in the existing digital-to-analog conversion technology, consider adjusting the current source array in the calibration circuit of the digital-to-analog converter DAC to calibrate the DAC input digital code, so as to realize high-precision and high-speed DAC.

[0022] The technical solutions of the present invention will be described in further detail below through specific embodiments in conjunction with the accompanying drawings, so that those skilled in the art can better understand the principle and specific implementation details of the present invention. It should be noted that the specific embodiments shown are for the convenience of those skilled in the art to better understand the present invention, and do not constitute any limitation to the present invention.

[0023] Best Embodiment for Realizing the Invention

[0024] The preferred embodiment of the present invention will be described in detail below.

[0025] In the existi...

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PUM

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Abstract

The present application relates to a digital-to-analog converter DAC and its calibration circuit. The DAC includes a calibration circuit, a current-type digital-to-analog conversion unit, and an enabling logic unit, which are connected in pairs, wherein: the calibration unit is used to calibrate the digital code input to the DAC, and output the calibrated digital code to the current-type digital-analog The conversion unit, and output the calibration completion signal to the enabling logic unit; the enabling logic unit is used to enable the working clock output to the current-mode digital-analog conversion unit according to the calibration completion signal; the current-mode digital-analog conversion unit is used for Digital-to-analog conversion is performed according to the calibrated digital code. The present application calibrates the input digital code of the DAC by adjusting the current source array in the calibration circuit of the digital-to-analog converter DAC, so as to realize a high-precision and high-speed DAC.

Description

technical field [0001] The present application relates to the field of digital-to-analog signal conversion, specifically, to a digital-to-analog converter DAC and a calibration circuit thereof. Background technique [0002] Traditional DAC calibration circuits such as figure 1 shown. Its specific working principle is as follows: the input terminals of the OTA (transconductance amplifier) ​​are respectively connected to the two ends of two matched resistors R2 and R1. The current flowing through the resistor R2 is the least significant bit LSB (least significant bit) current, which is used as a reference current to correct the currents of other current source units. The current flowing through the resistor R1 is the current source to be corrected, and the number of the current source is determined by the structure and number of digits of the DAC. OTA compares the voltage values ​​of V1 and V2, the output voltage of its output terminal is connected to the input terminal of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/10
Inventor 孙明张卫新朱偱宇
Owner ETOWNIP MICROELECTRONICS BEIJING CO LTD