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D/A converting circuit and converting method

A digital-to-analog conversion circuit and circuit technology, applied in the direction of digital-to-analog converters, etc., can solve problems affecting the precision of digital-to-analog conversion, digital signal differences, and digital-to-analog conversion results, and achieve simple structure, improved performance, improved accuracy and The effect of stability

Active Publication Date: 2010-06-09
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the above reasons, there are differences in the digital signals output by the processor, resulting in differences in the filtered digital-to-analog conversion results, which affects the accuracy of digital-to-analog conversion

Method used

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  • D/A converting circuit and converting method

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Embodiment 1

[0029] The PWM signal shaping circuit of the present invention can be realized by a logic gate circuit, and the logic gate circuit can be composed of AND gates, can be composed of NOT gates, and can also be composed of AND gates and NOT gates. Such as Figure 4 As shown, the PWM signal shaping circuit of this embodiment is a NOT gate, and its input and output terminals are respectively used as the input and output ends of the PWM signal shaping circuit, and the PWM signal output by the processor is added to the input of the NOT gate U1 , after shaping, the PWM signal becomes a PWM signal with a low level of 0V and a high level of power supply voltage, which is output to the third-order low-pass filter of the subsequent stage from its output terminal, and the third-order low-pass filter After the shaped PWM signal is filtered, the corresponding analog signal is obtained, and the process of digital-to-analog conversion is completed.

[0030] Figure 4 The third-order low-pass ...

Embodiment 2

[0033] Such as Figure 5 As shown, the PWM signal shaping circuit of the present invention includes a reference voltage circuit, a twelfth resistor R12, a twenty-second resistor R22, a thirty-second resistor R32 and a twelfth operational amplifier U12, and the DC power supply VCC passes through the twelfth resistor R12 is connected to the inverting input terminal of the twelfth operational amplifier U12, and this connection point is grounded through the twenty-second resistor R22; the output terminal of the reference voltage circuit is connected to the twelfth operational amplifier through the thirty-second resistor R32 The output terminal of U12; The forward input terminal and the output terminal of the twelfth operational amplifier U12 are respectively used as the input terminal and the output terminal of the PWM signal shaping circuit; It should be pointed out here that the twelfth operational amplifier U12 It can be replaced by a comparator, and the shaping effect will be ...

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PUM

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Abstract

The invention relates to digital to analogue converting circuit and converting method, the circuit includes processor and low pass filter, the output end of processor is coupled with the input end ofthe low pass filter; it also includes digital signal shaping circuit which is connected with the output end of the processor and input end of the low pass filter to shape the digital signal output bythe processor, so the low level of digital signal corresponding with 0 level, the high level is corresponding with power source voltage and output digital signal shaped to the low pass filter, the lowpass filter outputs corresponding analogue signal. The method includes: the digital signal shaping circuit shapes the digital signal output by processor, and makes low level of digital signal corresponding with 0 levels, high level is corresponding with power voltage, and outputs shaped digital signal to the low pass filter, the low pass filter outputs corresponding analogue signal. The inventionadds digital signal shaping circuit, and increases the performance of digital to analogue converting circuit.

Description

[technical field] [0001] The invention relates to a digital-to-analog conversion circuit and a conversion method for converting digital signals into analog signals. [Background technique] [0002] Digitization and intelligence are the development trend of today's electronic equipment. In a large number of practical applications, digital control and digital processing require conversion between analog and digital quantities. Existing digital-to-analog conversion circuits, such as figure 1 As shown, the digital-to-analog conversion circuit includes a processor and a low-pass filter, wherein the processor adopts a micro-processing unit (MCU) or a digital signal processor (DSP); the I / O port (output end) of the processor sends a digital signal (such as a PWM signal), the low-pass filter filters the digital signal, and then outputs the corresponding analog signal, thus completing the process of digital-to-analog conversion. [0003] Take the processor outputting 3.3V TTL level ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
Inventor 蔡志开王渭渭
Owner VERTIV CORP