Analog input buffer circuit

Abstract

The utility model discloses an analog input buffer circuit, comprising an input protection unit used for carrying out overvoltage protection on an input signal; the filtering processing unit is connected with the input protection unit and is used for filtering high-frequency noise of the input signal; the positive input end of the operational amplifier is connected with the filtering processing unit, and the negative input end of the operational amplifier is directly connected with the output end of the operational amplifier to form a voltage follower structure used for isolating and amplifying input signals. According to the design of the analog input buffer circuit, through input and output protection, filtering processing and application of the operational amplifier, the integrity and stability of signals are effectively guaranteed, and the overall performance of the circuit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of buffer circuits, and more specifically, to an analog input buffer circuit. Background Art

[0002] In an electronic circuit, the input of an analog signal needs to be buffered to ensure the integrity and stability of the signal during transmission.

[0003] Traditional analog input circuits may have problems such as signals being vulnerable to interference and amplitude instability, and cannot meet the requirements of high-precision circuits. Therefore, an effective analog input buffer circuit is needed to solve these problems. Summary of the Utility Model

[0004] To overcome the above-mentioned defects of the prior art, an embodiment of the utility model provides an analog input buffer circuit. The technical problem to be solved by the utility model is that the design of the analog input buffer circuit effectively ensures the integrity and stability of the signal and improves the overall performance of the circuit through input and output protection and filtering processing, as well as the application of operational amplifiers.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] An analog input buffer circuit, comprising:

[0007] An input protection unit for overvoltage protection of the input signal;

[0008] A filtering processing unit connected to the input protection unit for filtering high-frequency noise of the input signal;

[0009] An operational amplifier, whose positive input terminal is connected to the filtering processing unit, and the negative input terminal is directly connected to the output terminal to form a voltage follower structure for isolating and amplifying the input signal;

[0010] An output protection unit connected to the output terminal of the operational amplifier for preventing the impact of transient high voltage at the output terminal on the subsequent circuit;

[0011] A terminal filtering unit connected to the output protection unit for further filtering high-frequency noise of the output signal to ensure the stability of the output signal.

[0012] As Figure 1 shown, the specific implementation manner is: the input protection unit includes TVS diodes connected in parallel at the analog input terminal.

[0013] In a preferred implementation manner, the filtering processing unit includes filtering capacitors connected in parallel at the input terminal.

[0014] In a preferred embodiment, the output protection unit includes a TVS diode connected in parallel to the output terminal of the operational amplifier.

[0015] In a preferred embodiment, the terminal filtering unit includes a filtering capacitor connected in parallel to the output signal terminal.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] Signal isolation: By providing a high input impedance and a low output impedance at the input and output terminals of the circuit through an operational amplifier, the input signal is not affected by the subsequent circuit, ensuring the isolation of the signal.

[0018] Signal amplification: The operational amplifier amplifies the input signal to meet the requirements of the subsequent circuit for the signal amplitude and improves the signal strength.

[0019] Signal filtering: Filtering capacitors are installed at the input and output terminals to effectively filter out high-frequency noise, ensuring the purity of the signal and improving the signal quality.

[0020] Overvoltage protection: TVS diodes are installed at the input and output terminals to prevent damage to the circuit caused by transient high voltages, enhancing the reliability and stability of the circuit.

[0021] Overall stability: The design of this analog input buffer circuit effectively ensures the integrity and stability of the signal and improves the overall performance of the circuit through input and output protection, filtering processing, and the application of an operational amplifier. Brief Description of the Drawings

[0022] Figure 1 The figure is a circuit diagram of an analog input buffer circuit proposed by the present utility model. Detailed Embodiment

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0024] Referring to Figure 1 , an analog input buffer circuit includes:

[0025] An input protection unit for overvoltage protection of the input signal;

[0026] A filtering processing unit connected to the input protection unit for filtering out high-frequency noise of the input signal;

[0027] An operational amplifier, whose positive input terminal is connected to the filtering processing unit, and whose negative input terminal is directly connected to the output terminal, forms a voltage follower structure for isolating and amplifying the input signal;

[0028] An output protection unit, connected to the output terminal of the operational amplifier, is used to prevent the impact of transient high voltage at the output terminal on the subsequent circuit;

[0029] A terminal filtering unit, connected to the output protection unit, is used to further filter out the high-frequency noise of the output signal and ensure the stability of the output signal.

[0030] The input protection unit includes a TVS diode connected in parallel at the analog input terminal.

[0031] The filtering processing unit includes a filtering capacitor connected in parallel at the input terminal.

[0032] The output protection unit includes a TVS diode connected in parallel at the output terminal of the operational amplifier.

[0033] The terminal filtering unit includes a filtering capacitor connected in parallel at the output signal terminal.

[0034] Only some exemplary embodiments of the present invention have been described above by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An analog input buffer circuit, characterized in that Comprising: An input protection unit for overvoltage protection of the input signal; A filtering processing unit connected to the input protection unit for filtering out high-frequency noise of the input signal; An operational amplifier, whose positive input terminal is connected to the filtering processing unit, and the negative input terminal is directly connected to the output terminal to form a voltage follower structure for isolating and amplifying the input signal; An output protection unit connected to the output terminal of the operational amplifier for preventing the influence of transient high voltage at the output terminal on the subsequent circuit; A terminal filtering unit connected to the output protection unit for further filtering out high-frequency noise of the output signal to ensure the stability of the output signal.

2. The analog input buffer circuit according to claim 1, wherein: The input protection unit includes a TVS diode connected in parallel to the analog input terminal.

3. The analog input buffer circuit according to claim 2, characterized in that: The filtering processing unit includes a filtering capacitor connected in parallel to the input terminal.

4. The analog input buffer circuit according to claim 3, wherein: The output protection unit includes a TVS diode connected in parallel to the output terminal of the operational amplifier.

5. The analog input buffer circuit according to claim 4, wherein: The terminal filtering unit includes a filtering capacitor connected in parallel to the output signal terminal.

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