Conversion circuit based on resistance voltage division and voltage interpolation and digital-to-analog converter

Abstract

The invention provides a conversion circuit based on resistance voltage division and voltage interpolation and a digital-to-analog converter, and relates to the technical field of integrated circuits. The circuit comprises a resistance voltage dividing unit which receives a reference voltage, a row selection signal and a column selection signal, and outputs a top end voltage and a bottom end voltage to a voltage interpolation unit; the voltage interpolation unit receives the top end voltage and the bottom end voltage and outputs a result voltage. The resistance voltage dividing unit comprises a plurality of unit resistors and a plurality of switches, the states of the switches are controlled by a row selection signal and a column selection signal, and the number of the unit resistors is determined by a coarse conversion digit; the voltage interpolation unit comprises a plurality of PMOS tubes, and the number of the PMOS tubes is determined by the fine conversion digits. According to the conversion circuit, on the basis that high-precision conversion and good monotonicity of the digital-to-analog converter are guaranteed, the number of unit resistors and the number of switches are greatly reduced, the physical area occupied by the unit resistors and the switches is reduced, the control logic complexity is reduced, and the high practical value is achieved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a conversion circuit and a digital-to-analog converter based on resistance voltage division and voltage interpolation. Background technique [0002] At present, in the digital-to-analog converters that realize high-precision digital-to-analog conversion functions based on the resistor divider structure, a large number of unit resistances and a large number of switches are required, which not only leads to a large physical area of ​​the entire digital-to-analog converter, but also the control logic. more complicated. [0003] For example: Take a 16-bit digital-to-analog converter (Digital to Analog Convertor abbreviated as DAC) as an example. If the resistance divider X-Y Selection structure is used, the number of switches and resistors required are large, and a total of 65792 switches and 65536 are required. unit resistance. Such a number of unit resistors and switc...

AI Technical Summary

Problems solved by technology

Such a number of unit resistors and switches will inevitably occupy a large physical area, and the control logic based on 65792 switches is also relatively complicated

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