Digital correction circuit and digital-to-analog converter of current-steering structure and with same

Abstract

The invention belongs to the technical field of digital simulation hybrid-integrated-circuits, and discloses a digital correction circuit and a digital-to-analog converter of a current-steering structure and with the digital correction circuit. The digital-to-analog converter solves the problems that in the prior art, a digital-to-analog converter of a current-steering structure occupies a larger domain area, cost of chips is increased, large stray capacitance and parasitic resistance are brought to currents, and dynamic performance of the digital-to-analog converter is influenced. Voltage at the two ends of a first resistor is collected and compared when a current source control switch is under an opening state and a closing state through the digital correction circuit, control codes for a current source in high-order current source arrays are generated through successive approximation, and thus the digital-to-analog converter is corrected, namely actual values of the magnitude of the currents of the high-order current source are regulated to reference values through continuous comparison and the successive approximation. The digital-to-analog converter greatly shortens the domain area of the high-order current source of a thermometer code, meanwhile guarantees performance, and is suitable for digital-to-analog conversion operation.

Description

technical field [0001] The invention belongs to the technical field of digital-analog hybrid integrated circuits, in particular to a digital correction circuit and a digital-to-analog converter with a current steering structure including the circuit. Background technique [0002] In the fields of signal acquisition and processing, digital communication, automatic detection and multimedia technology, digital-to-analog converter (DAC) is often an indispensable part. Among various DAC structures, the DAC with the current steering structure has great advantages in speed and precision, so it is widely used. In the actual current steering structure digital-to-analog converter, high precision, low differential nonlinear error, integral nonlinear error, and high signal-to-noise ratio are required, which requires good compatibility between the actual circuit and the process. In order to meet the high-precision requirements, the current source array often needs a large aspect ratio t...

AI Technical Summary

Problems solved by technology

The increase of the current source area will bring a large parasitic capacitance and parasitic resistance to the current source, thus affecting the dynamic performance of the DAC

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