Ten-bit superspeed CMOS digital to analog converter based on MOS current mode logic

Abstract

The invention discloses a CMOS digital to analog converter, mainly aiming to solve the problems of large switch noise, poor circuit precision and low speed of the traditional CMOS digital to analog converter under the condition of low power consumption. The CMOS digital to analog converter is composed of an input synchronization latch, a thermometer decoder, a delay equalizer, a latch, a current switch driver, an NMOS current source array and a band-gap reference voltage source, wherein the thermometer decoder adopts a parallel thermometer decoder structure and consists of an AND gate / NAND gate logical unit and an OR gate / NOR gate logical unit of an MOS current mode logical structure; the delay equalizer comprises a reverse directional device of the MOS current mode logic structure; both the latch and the current switch driver adopt the MOS current mode logic structure; and the input end of the NMOS current source array is connected with the complementary output ends of the latch and the current switch driver so as to generate complementary output current. The CMOS digital to analog converter in the invention has the advantages of small output pendulum deflection and switch noise, high circuit precision and rapid working speed, and can be applicable to communication, signal processing and video processing systems.

Description

technical field [0001] The invention belongs to the field of microelectronics, in particular to a CMOS digital-to-analog converter used in communication, signal processing and video processing systems. Background technique [0002] The continuous development of modern communication systems, information processing systems and video processing systems has prompted digital-analog hybrid circuit designers to devote themselves to the research of high-speed data converter IP cores. Among them, the embedded application of digital-to-analog converters in HDTV, mobile communication and other fields makes the design of high-speed and low-power consumption an important direction for the development of modern digital-to-analog converters. [0003] A traditional CMOS digital-to-analog converter consists of an input synchronous latch, a thermometer decoder and a delay equalizer, a latch and current switch driver, an array of NMOS current sources, and a bandgap reference voltage source. Th...

AI Technical Summary

Problems solved by technology

The full-swing operation of CMOS logic exacerbates switching noise, which can be coupled to the analog part through the substrate and power lines, thereby affecting the accuracy of the circuit

Under the traditional CMOS logic structure, although reducing the power supply voltage is the most direct and effective way to complete low-power design, the reduction of the power supply voltage is at the expense of speed performance

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