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Digital-to-analog conversion circuit

A digital-to-analog conversion circuit and resistor technology, applied in the field of signal processing, can solve the problems of low adjustment resolution and high cost, reduce costs, reduce the demand for conversion bits, and improve the effect of adjustment resolution

Active Publication Date: 2022-02-01
SHENZHEN CLOU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a digital-to-analog conversion circuit to solve the problem of low adjustment resolution of an existing DAC digital system and high cost when improving the adjustment resolution

Method used

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] figure 1 and figure 2 An embodiment of the digital-to-analog conversion circuit of the present invention is shown. In this example, see figure 1 , the digital-to-analog conversion circuit MCU1, the peripheral circuit 2 and the analog signal output terminal 3. Wherein, the first DAC11, the second DAC12 and the ADC13 are integrated on the MCU1.

[0024] Specifically, see figure 2 , the peripheral circuit 2 includes a first resistor R120 and a second resistor R221. The output port of the first DAC11 is IO1, and the output port of the second DAC12 is IO2.

[0025] The first resistor R12...

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Abstract

The invention discloses a digital-to-analog conversion circuit, which comprises: an MCU on which a first DAC and a second DAC are integrated; an analog signal output terminal; a first resistor R1 connected between the first DAC and the analog signal output terminal ; The second resistor R2 is connected between the second DAC and the analog signal output terminal, wherein, R1>R2; the MCU controls the value of the second DAC to determine the required sub-range within the preset voltage range, and the MCU controls the first The value of a DAC to determine the required voltage in the required sub-range, and output the required voltage through the analog signal output terminal. The MCU of the present invention controls the first DAC and the second DAC, so that when the adjustment range is kept at the preset voltage range, the adjustment resolution of the digital-to-analog conversion circuit is improved, and the adjustment resolution of the first DAC and the second DAC is reduced. The demand for the number of conversion bits, thereby reducing the cost of the digital-to-analog conversion circuit.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a digital-to-analog conversion circuit. Background technique [0002] With the development of technology, DAC in many digital systems (such as: computers), the signal is stored and transmitted digitally, and DAC can convert such digital signal into analog signal, so that it can be recognized by the outside world (other non-digital systems) . [0003] Current existing digital systems convert digital signals to analog signals through a DAC and an external control circuit. Since the number of conversion bits of the DAC is limited, the adjustment resolution of the DAC is limited. In such a case, in order to obtain a higher adjustment resolution, an existing method is to increase the number of conversion bits of the DAC. However, DACs have more conversion bits, and DACs are more expensive to produce. Contents of the invention [0004] The purpose of the present inventi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
CPCH03M1/66
Inventor 叶运友李仁彪刘飞峰陈迪虎
Owner SHENZHEN CLOU ELECTRONICS
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