Layout Structure and Chip Based on Resistor String Digital-to-Analog Converter

Abstract

The present application provides a layout structure and chip based on a resistor string digital-to-analog converter. In the layout structure based on a resistor string digital-to-analog converter, at least one resistor array unit, at least one voltage selection switch array unit and a digital logic circuit unit are provided. Arranged in sequence, the first metal layer is used for the wiring of the first analog signal line of the at least one resistor array unit, and the second metal layer is used for the second analog signal of the at least one resistor array unit and at least one voltage selection switch array unit The wiring of wires, the wiring of at least one voltage selection switch array unit and the first digital signal line of the digital logic circuit unit, and the wiring direction of the second analog signal line and the first digital signal line are consistent. It can be seen that such a layout structure is simple and clear, which can not only meet the needs of RDAC for device matching, but also can be used flexibly, improving the efficiency of layout design and saving chip development costs.

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.

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