Layout structure based on resistor string digital-to-analog converter, and chip

Abstract

The invention provides a layout structure based on a resistor string digital-to-analog converter, and a chip. The layout structure based on the resistor string digital-to-analog converter comprises: at least one resistor array unit, at least one voltage selection switch array unit and a digital logic circuit unit which are arranged in sequence, wherein a first metal layer is used for wiring of the first analog signal lines of the at least one resistor array unit, a second metal layer is used for wiring of the second analog signal lines of the at least one resistor array unit and the at least one voltage selection switch array unit, and wiring of the first digital signal lines of the at least one voltage selection switch array unit and the digital logic circuit unit, and the wiring directions of the second analog signal line and the first digital signal line are consistent. According to the invention, the layout structure is simple and clear in wiring, not only can meet the requirement of the RDAC for device matching, but also can be flexibly used, the layout design efficiency is improved, and the chip development cost is saved.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a layout structure and chip based on a resistor string digital-to-analog converter. Background technique [0002] As a bridge between the digital world and the analog world, digital-to-analog converters are widely used in consumer electronics, communication systems, military / civil electronic systems, and many other aspects. The resistance string digital-to-analog converter (RDAC) has simple structure and good monotonicity, and is widely used in integrated circuits. RDAC controls the n-bit voltage selection switch array to select the required reference voltage from the resistor string through the input signal to realize the conversion from digital signal to analog signal. However, with the improvement of precision, the number of switch tubes and resistors of the voltage selection switch array required by the circuit increases sharply, and the area of ​​the chip also...

AI Technical Summary

Problems solved by technology

However, with the improvement of precision, the number of switch tubes and resistors in the voltage selection switch array required by the circuit increases sharply, and the area of ​​the chip also increases accordingly, so that the manufacturing cost of the chip also increases.

Images