Analog-to-digital conversion circuit

An analog-to-digital conversion circuit and circuit technology, applied in the direction of analog-to-digital conversion, analog-to-digital converter, code conversion, etc., can solve the problems of insufficient performance, low sampling frequency of software control, waste of resources, etc., and achieve low cost and high sampling. The effect of low power rate and hardware resource requirements

Pending Publication Date: 2022-05-13
HANGZHOU SILAN MICROELECTRONICS
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Problems solved by technology

[0005] In practical applications, different reference voltages need to be selected for different analog signals. In the prior art, the number of ADCs is increased or the switching of reference voltages is controlled by software, but multiple ADCs only partially work at the same time, resulting in waste of resources. , the software-controlled sampling frequency is low, and the performance is insufficient

Method used

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  • Analog-to-digital conversion circuit
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  • Analog-to-digital conversion circuit

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Embodiment Construction

[0023] Various embodiments of the invention will be described in more detail below with reference to the accompanying drawings. In the various drawings, the same elements are denoted by the same or similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale.

[0024] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0025] figure 1 A schematic structural diagram of a sampling circuit for the first type of analog signal is shown.

[0026] refer to figure 1 , the sampling circuit is, for example, a temperature sensor sampling circuit, the second resistor R2 and the first resistor R1 are sequentially connected in series between the voltage source VDD and the ground GND, the second resistor R2 is a temperature-sensitive resistor, and the sampling voltage VAD1=VDD ×R1 / (R1+R2), when the temperature is stable, th...

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Abstract

According to the analog-to-digital conversion circuit, a first multi-path selection circuit is arranged to select an analog signal output to a conversion module, and a second multi-path selection circuit is arranged to select a reference voltage signal output to the conversion module. The analog-to-digital conversion circuit provided by the invention can select the corresponding reference voltage signal to participate in analog-to-digital conversion according to the type of the output analog signal, the analog-to-digital conversion precision of the analog-to-digital conversion on various analog signals is improved, high-precision analog-to-digital conversion on various analog signals can be realized through a single conversion module, the hardware resource demand is small, and the cost is low. The cost is low, selection is realized through multipath selection circuit hardware, and a high sampling rate can be supported.

Description

technical field [0001] The present invention relates to the technical field of electronic systems, in particular to an analog-to-digital conversion circuit. Background technique [0002] Analog-to-Digital Converter (Analog-to-Digital Converter, ADC) is a device that compares continuous analog quantities such as voltage, current, temperature or images with standard quantities, and converts them into digital quantities expressed in binary. Its accuracy and cost greatly affect the performance and cost of the actual system. [0003] ADC work requires a reference analog as a conversion standard, also called the reference voltage of the ADC. The more common reference voltage is the maximum convertible signal size, and the output digital quantity indicates the size of the input signal relative to the reference voltage. Reference voltage selection can generally be divided into two types: external reference voltage and internal reference voltage. [0004] The external reference vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12
CPCH03M1/1245
Inventor 王建龙赵光焕施磊
Owner HANGZHOU SILAN MICROELECTRONICS
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