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

Abstract

The invention provides a conversion circuit based on resistance voltage division and capacitance integration and a digital-to-analog converter, and relates to the technical field of integrated circuits. The circuit comprises a resistance voltage division unit and a capacitance integration unit, the resistance voltage dividing unit receives a reference voltage and outputs a first analog voltage or a second analog voltage to the capacitance integration unit. The capacitance integration unit comprises a first sampling transfer module and a second sampling transfer module; the first sampling transfer module and the second sampling transfer module perform sampling alternately, control time sequences are complementary, and when the first sampling transfer module performs charge transfer, the second sampling transfer module performs pre-sampling. According to the conversion circuit, on the basis that high-precision conversion and good monotonicity of the digital-to-analog converter are guaranteed, the clock frequency needed by the whole digital-to-analog conversion is reduced in a phase-changing mode, equivalently, the power consumption needed by the digital-to-analog conversion is reduced, and the conversion circuit has high practical value.

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 capacitance integration. Background technique [0002] At present, in the digital-to-analog converter that realizes the digital-to-analog conversion function, there are generally five steps to realize the digital-to-analog conversion: first, sampling is performed, and after the sampling is completed, the charge is transferred, and the charge is transferred to the integrating capacitor for integration, and then stored in the On the sampling capacitor, the final conversion result is output by combining the sampling capacitor with the buffer. [0003] In the above five steps, the entire digital-to-analog conversion is realized in sequence, but the clock frequency required to realize the digital-to-analog conversion in this way is relatively high, and the power consumption requ...

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Problems solved by technology

[0003] In the above five steps, they are completed sequentially to realize the entire digital-to-analog conversion, but at present, the clock frequency require

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