Cutting comparison circuit suitable for analog-to-digital converter

Abstract

The utility model relates to a cutting comparison circuit suitable for an analog-to-digital converter, comprising an MCU unit, a cutting unit and a comparison unit, the output end of the MCU unit is connected with the input end of the cutting unit, the output end of the cutting unit is connected with one input end of the comparison unit, and the output end of the comparison unit is connected with the other input end of the cutting unit. And the other input end of the comparison unit is connected with an initial signal input end. According to the utility model, the output accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to a cutting comparison circuit suitable for an analog-to-digital converter. Background Art

[0002] The rapid development of computer technology, communication technology and microelectronics technology has greatly promoted the development of analog to digital converters (ADCs). The output of an analog to digital converter can be regarded as a description of an analog signal.

[0003] After searching, the patent: analog-to-digital converter (CN202211664154.1), an integrator and an integrator coupled sub-analog-to-digital conversion structure, which includes: a comparator array and a resistor network, the comparator array includes 2n-1 comparators, the first input end of each comparator is connected to the input voltage, and the output end of each comparator is connected to the decoder. The resistor network includes 2n-1-1 2R resistors connected in series, each of the 2n-1-1 2R resistors is sequentially connected between the second input ends of adjacent comparators in the 2n-1 comparators, one end of the first 2R resistor is connected to the first reference voltage through the first control switch and an R resistor and the second control switch, and one end of the last 2R resistor is connected to the second reference voltage through a 2R resistor and the first control switch and an R resistor and the second control switch.

[0004] At present, the oversampling analog-to-digital converter is a commonly used analog-to-digital converter, and the ∑-Δ ADC (Sigma-Delta analog-to-digital converter) is widely used. The ∑-Δ ADC may include an anti-aliasing filter, a ∑-Δ modulator, and a downsampling filter. Specifically, the analog signal first passes through the anti-aliasing filter to attenuate the noise and components outside the frequency band, and then the ∑-Δ modulator performs oversampling and noise shaping processing on the analog signal output by the anti-aliasing filter, and converts it into a high-speed, low-resolution bit stream (i.e., a 1-bit data stream). Finally, the bit stream passes through the downsampling filter to filter out the high-frequency noise outside the signal frequency band and the downsampling extraction processing, and is converted into a low-speed, high-resolution digital signal and outputs it. It can be understood that the output result of the downsampling filter is the description of the analog signal. However, the traditional analog-to-digital converter has the problem that the description of the analog signal is not fine enough and there are limitations.

[0005] In view of the above-mentioned defects, the designers have actively carried out research and innovation in order to create a new structure of cutting comparison circuit suitable for analog-to-digital converters, making it more valuable for industrial use. Utility Model Content

[0006] In order to solve the above technical problems, the purpose of the utility model is to provide a cutting comparison circuit suitable for an analog-to-digital converter.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A cutting comparison circuit suitable for an analog-to-digital converter comprises an MCU unit, a cutting unit and a comparison unit, wherein the output end of the MCU unit is connected to the input end of the cutting unit, the output end of the cutting unit is connected to an input end of the comparison unit, and the other input end of the comparison unit is connected to an initial signal input end;

[0009] The comparison unit includes a chip IC1A, a second pin of the chip IC1A is connected to the initial signal input end through a resistor R3, a resistor R5, a capacitor C2, a capacitor C8 and a capacitor C12 are connected in parallel between the second pin of the chip IC1A and the resistor R3, the capacitor C12 is connected to the eighth pin of the chip IC1A through a capacitor C14, the first pin of the chip IC1A is the output end, the third pin of the chip IC1A is connected to the output end of the cutting unit through a resistor R4, a resistor R6, a capacitor C3, a capacitor C9 and a capacitor C13 are connected in parallel between the third pin of the chip IC1A and the resistor R4 and are connected to the fourth pin of the chip IC1A.

[0010] Preferably, in the cutting comparison circuit suitable for an analog-to-digital converter, the chip model of the MCU unit is LPC1115.

[0011] Preferably, in the cutting comparison circuit suitable for an analog-to-digital converter, the model of the chip IC1A is LM393.

[0012] Preferably, the cutting comparison circuit suitable for an analog-to-digital converter, the cutting unit includes a chip IC11, the fourth pin of the chip IC11 is connected to an input end of the comparison unit, the third pin of the chip IC11 is connected to the fifth pin of the chip IC11 through a capacitor C11, and the second pin of the chip IC11 is connected to the MCU unit.

[0013] Preferably, in the cutting comparison circuit suitable for an analog-to-digital converter, the model of the chip IC11 is MC74VHC1G04DTT1G.

[0014] By means of the above solution, the utility model has at least the following advantages:

[0015] The utility model compares the cutting unit with the original signal, thereby improving the accuracy of the output.

[0016] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a principle block diagram of the utility model;

[0019] Figure 2 It is the actual circuit diagram of the utility model. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] Example

[0023] like Figure 1 and Figure 2 As shown, a cutting comparison circuit suitable for an analog-to-digital converter includes an MCU unit 1, a cutting unit 2 and a comparison unit 3, wherein the output end of the MCU unit 1 is connected to the input end of the cutting unit 2, the output end of the cutting unit 2 is connected to an input end of the comparison unit 3, and the other input end of the comparison unit 3 is connected to the initial signal input end;

[0024] The comparison unit 3 includes a chip IC1A, a second pin of the chip IC1A is connected to the initial signal input terminal through a resistor R3, a resistor R5, a capacitor C2, a capacitor C8 and a capacitor C12 are connected in parallel between the second pin of the chip IC1A and the resistor R3, the capacitor C12 is connected to the eighth pin of the chip IC1A through a capacitor C14, the first pin of the chip IC1A is the output terminal, the third pin of the chip IC1A is connected to the output terminal of the cutting unit 2 through a resistor R4, a resistor R6, a capacitor C3, a capacitor C9 and a capacitor C13 are connected in parallel between the third pin of the chip IC1A and the resistor R4 and are connected to the fourth pin of the chip IC1A.

[0025] The chip model of the MCU unit 1 in the present invention is LPC1115.

[0026] The model of the chip IC1A in the utility model is LM393.

[0027] The cutting unit 2 described in the utility model includes a chip IC11, the fourth pin of the chip IC11 is connected to an input end of the comparison unit 3, the third pin of the chip IC11 is connected to the fifth pin of the chip IC11 through the capacitor C11, and the second pin of the chip IC11 is connected to the MCU unit, wherein the model of the chip IC11 is MC74VHC1G04DTT1G.

[0028] The working principle of the utility model is as follows:

[0029] During specific operation, one input signal and another signal output by the cutting unit controlled by the MCU unit enter the comparison unit for comparison to obtain the output signal. During this process, each time the comparator in the comparison unit completes a comparison of the cutting unit output, it also synchronously completes a quantization, thereby achieving accurate output.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of this application, it should be noted that the terms "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or vertical, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A cutting comparison circuit suitable for an analog-to-digital converter, characterized in that: It comprises an MCU unit (1), a cutting unit (2) and a comparison unit (3), wherein the output end of the MCU unit (1) is connected to the input end of the cutting unit (2), the output end of the cutting unit (2) is connected to an input end of the comparison unit (3), and the other input end of the comparison unit (3) is connected to an initial signal input end; The comparison unit (3) comprises a chip IC1A, wherein the second pin of the chip IC1A is connected to the initial signal input terminal via a resistor R3, a resistor R5, a capacitor C2, a capacitor C8 and a capacitor C12 connected in parallel are connected between the second pin of the chip IC1A and the resistor R3, the capacitor C12 is connected to the eighth pin of the chip IC1A via a capacitor C14, the first pin of the chip IC1A is an output terminal, the third pin of the chip IC1A is connected to the output terminal of the cutting unit (2) via a resistor R4, a resistor R6, a capacitor C3, a capacitor C9 and a capacitor C13 connected in parallel are connected between the third pin of the chip IC1A and the resistor R4 and are connected to the fourth pin of the chip IC1A.

2. A cutting comparison circuit suitable for an analog-to-digital converter according to claim 1, characterized in that: The chip model of the MCU unit (1) is LPC1115.

3. A cutting comparison circuit suitable for an analog-to-digital converter according to claim 1, characterized in that: The model of the chip IC1A is LM393.

4. The cutting comparison circuit suitable for an analog-to-digital converter according to claim 1, characterized in that: The cutting unit (2) comprises a chip IC11, a fourth pin of the chip IC11 is connected to an input end of the comparison unit (3), a third pin of the chip IC11 is connected to a fifth pin of the chip IC11 via a capacitor C11, and a second pin of the chip IC11 is connected to the MCU unit.

5. The cutting comparison circuit suitable for an analog-to-digital converter according to claim 1, characterized in that: The model of the chip IC11 is MC74VHC1G04DTT1G.

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