Current steering digital-analog converter with time domain error correction function

Abstract

The invention discloses a current steering digital-analog converter with time domain error correction function. The current steering digital-analog converter comprises (n+1) digital-analog conversion channels and a time domain error correction unit, wherein the digital-analog conversion channel includes a latch, a time delay circuit and a current element; the time domain error correction unit includes a current square wave detector, a time difference amplifier and a time-digital converter. Due to the presence of the time difference amplifier and the time-digital converter, the time domain error existing in the digital-analog converter can be amplified linearly, and can be directly converted to a digital quantity, thereby greatly improving the time domain error detection accuracy. In addition, the current steering digital-analog converter provided by the invention is easier and rapider in detecting small time domain error; and the correction unit in the invention can be realized completely by using a digital circuit, so that the static power consumption is almost equal to zero.

Description

technical field [0001] The invention belongs to the technical field of digital-to-analog conversion, and in particular relates to a current steering digital-to-analog converter with a time-domain error correction function. Background technique [0002] With the popularization of mobile communication technology and the introduction of the concept of system on chip (SOC), more analog signals and digital signals are integrated into one system chip. Since the development of processors has been able to adapt to the requirements of high-speed digital signal processing, the communication between high-speed processors and peripheral analog signal devices has become the main factor restricting high-speed signal processing systems; thus, in recent years, high-speed high-precision digital-analog Conversion chip design has been greatly developed. [0003] The current steering digital-analog converter is the most popular high-speed and high-precision digital-analog converter structure, ...

AI Technical Summary

Problems solved by technology

[0006] But the digital-to-analog converter also has the following defects: (1) the detection at the output of the digital-to-analog converter will affect the output performance; Introduce a large RC constant. If it is not matched properly, it will introduce a huge time-domain error, which will affect the detection of the original time-domain error; (3) The amplifier needs a large magnification to convert the input voltage signal into a lower-level circuit. The identified signal increases the circuit complexity and power consumption, and if the two amplifiers cannot be completely matched, additional time-domain errors will be introduced, which will affect the final detection; (4) The correction accuracy of the system is not high

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