Digital-to-analog converter based on current mirror

Abstract

The invention belongs to a wireless communication technology, and provides a digital-to-analog converter based on a current mirror, which is used for overcoming the problems of large occupied area, low integration level, low data conversion precision, low conversion speed and the like of the traditional charge proportion digital-to-analog converter. The digital-to-analog converter based on a current mirror mainly comprises a cascode current mirror array and a switching tube array, replication of reference current is realized on the basis of a cascode current mirror, only the ratio of gate width / gate length of different multiples of each replication tube to the reference tube in the cascode current mirror array needs to be set, opening and closing of each switching tube in the switching tube array under the control of a control bit digital signal are matched, and current of different multiples is obtained through replication. The current passes through a load resistor to generate an output voltage, namely, data conversion from a digital signal to an analog signal is realized, the data conversion speed is high, and the conversion precision is high; moreover, the circuit is completelycomposed of transistors, and is small in occupied area, high in integration degree and high in stability.

Description

technical field [0001] The invention belongs to wireless communication technology, relates to a digital-to-analog converter (DAC), and specifically provides a digital-to-analog converter based on a current mirror. Background technique [0002] With the rapid development of wireless technology and the expansion of application scenarios, coupled with the huge improvement of the integrated circuit industry technology, the miniaturization of transceiver modules has become a trend, and the research and development of high-performance integrated chips has become an important issue in academia and industry. hot spot. Analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) are used in modern advanced electronic systems to improve digital processing techniques, especially such as radar, sonar, high-resolution video and image display, so The integrated DAC has a wide range of application scenarios. [0003] In order to realize the conversion of digital signals to...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a digital-analog converter based on a current mirror to solve the problems of large occupied area, low integration, low data conversion accuracy and slow conversion speed in the above-mentioned traditional charge ratio digital-to-analog converter; The digital-to-analog converter structure uses a current mirror to replicate a certain proportion of the reference current, and uses a MOS tube as a switch tube to control and adjust different proportions to achieve high-precision data conversion. It has fast conversion speed, small footprint, high integration and The advantage of high reliability

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