All-pass common-mode voltage conversion front-end circuit supporting multi-terminal voltage, control method thereof, and integrated circuit

Abstract

This invention provides an all-pass common-mode voltage conversion front-end circuit supporting multiple terminal voltages, along with its control method and integrated circuit. The circuit includes: a signal input module for receiving differential input signals; a mode selection module for selecting different termination input voltages according to requirements, thereby obtaining corresponding termination voltage signals using the differential input signals; and a conversion control module for performing operational amplifier processing on the termination voltage signals to obtain common-mode voltage signals. The mode selection module allows for flexible selection of the corresponding termination input voltage, thus providing the corresponding termination voltage signal. The operational amplifier processing of the termination voltage signals by the conversion control module ensures high-speed all-pass transmission of the obtained common-mode voltage signal, improving transmission reliability and solving the problem that existing common-mode voltage conversion front-end circuits cannot adapt to multiple terminal voltages.

Description

Technical Field

[0001] This invention relates to the field of circuit design technology, and in particular to an all-pass common-mode voltage conversion front-end circuit that supports multiple voltage terminals, its control method, and an integrated circuit. Background Technology

[0002] In high-speed data transmission systems, the common-mode voltage conversion front-end circuit is a key interface unit connecting different modules. Its core function is to convert the common-mode voltage of the input signal into the target common-mode voltage that is compatible with the back-end circuit, while ensuring the integrity of the signal.

[0003] With the development of integrated circuit technology, different functional module circuits may use different power supply voltage systems, and the corresponding termination voltages also differ. This requires the common-mode voltage conversion front-end circuit to have multi-terminal voltage adaptation capability.

[0004] However, existing common-mode voltage conversion front-end circuits typically only adapt to one power supply voltage system and cannot adapt to multiple voltage levels, resulting in poor versatility. Often, different common-mode voltage conversion front-end circuits need to be designed for different functional modules, leading to a larger circuit footprint and higher power consumption. Furthermore, existing common-mode voltage conversion front-end circuits suffer from bandwidth limitations and signal distortion during high-speed signal transmission. Summary of the Invention

[0005] The purpose of this invention is to provide an all-pass common-mode voltage conversion front-end circuit that supports multiple voltages, as well as its control method and integrated circuit, so as to at least solve the problem that existing common-mode voltage conversion front-end circuits cannot adapt to multiple voltages.

[0006] To solve the above-mentioned technical problems, the present invention provides an all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, comprising: The signal input module is used to receive differential input signals; The mode selection module is used to select different termination input voltages according to requirements, so as to obtain the corresponding termination voltage signal using the differential input signal; The conversion control module is used to process the termination voltage signal using an operational amplifier to obtain a common-mode voltage signal.

[0007] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, the mode selection module includes multiple voltage selection branches; the first terminal of each voltage selection branch is connected to an input voltage, and the first terminals of all voltage selection branches are connected to different input voltages; the second terminals of all voltage selection branches are connected to the first output terminal of the signal input module through a first resistor, and the second terminals of all voltage selection branches are connected to the second output terminal of the signal input module through a second resistor.

[0008] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, the resistance value of the first resistor is adjustable; the resistance value of the second resistor is adjustable.

[0009] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltages, the termination input voltage connected to the first terminal of at least one of the voltage selection branches is a floating voltage.

[0010] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, the first terminal of the voltage selection branch connected to the floating voltage is connected to the output terminal of a buffer; the first input terminal of the buffer is connected to a programmable voltage, and the second input terminal of the buffer is connected to the output terminal of the buffer.

[0011] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, the conversion control module includes an operational amplifier; the first input terminal of the operational amplifier is connected to the first output terminal of the signal input module, and the second input terminal of the operational amplifier is connected to the second output terminal of the signal input module; the first input terminal of the operational amplifier is connected to the first output terminal of the operational amplifier through a first closed-loop resistor, and the second input terminal of the operational amplifier is connected to the second output terminal of the operational amplifier through a second closed-loop resistor; the first and second output terminals of the operational amplifier output a common-mode voltage signal.

[0012] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, the resistance value of the first closed-loop resistor is adjustable; the resistance value of the second closed-loop resistor is adjustable.

[0013] Optionally, in the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, the conversion control module further includes a first capacitor and a second capacitor; the first terminal of the first capacitor is connected to the first output terminal of the signal input module, and the second terminal of the first capacitor is connected to the first output terminal of the operational amplifier; the first terminal of the second capacitor is connected to the second output terminal of the signal input module, and the second terminal of the second capacitor is connected to the second output terminal of the operational amplifier.

[0014] To address the aforementioned technical problems, the present invention also provides a control method for an all-pass common-mode voltage conversion front-end circuit supporting multiple terminal voltages, applied to the all-pass common-mode voltage conversion front-end circuit supporting multiple terminal voltages as described in any of the preceding claims, wherein the control method includes: Receive differential input signals; Select different termination input voltages according to requirements, so as to obtain the corresponding termination voltage signal using the differential input signal; The termination voltage signal is processed by an operational amplifier to obtain a common-mode voltage signal.

[0015] To address the aforementioned technical problems, the present invention also provides an integrated circuit, including an all-pass common-mode voltage conversion front-end circuit supporting multiple terminal voltages as described in any of the preceding claims.

[0016] Optionally, in the integrated circuit, the integrated circuit further includes an active continuous-time linear equalizer; the input terminal of the active continuous-time linear equalizer is connected to the common-mode voltage signal.

[0017] This invention provides an all-pass common-mode voltage conversion front-end circuit and its control method, as well as an integrated circuit supporting multiple terminal voltages. The circuit includes: a signal input module for receiving differential input signals; a mode selection module for selecting different termination input voltages according to requirements, so as to obtain corresponding termination voltage signals using the differential input signals; and a conversion control module for performing operational amplifier processing on the termination voltage signals to obtain common-mode voltage signals. The mode selection module allows for flexible selection of the corresponding termination input voltage, thereby providing the corresponding termination voltage signal. The operational amplifier processing of the termination voltage signals by the conversion control module ensures high-speed all-pass transmission of the obtained common-mode voltage signal, improving transmission reliability and solving the problem that existing common-mode voltage conversion front-end circuits cannot adapt to multiple terminal voltages. Attached Figure Description

[0018] Figure 1 This is a block diagram of the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals provided in this embodiment; Figure 2 This is a circuit schematic diagram of the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals provided in this embodiment; Figure 3 This is a flowchart of the control method for the all-pass common-mode voltage conversion front-end circuit that supports multiple voltage terminals provided in this embodiment. Detailed Implementation

[0019] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, provides a more comprehensive overview of the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, its control method, and the integrated circuit proposed in this invention. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, intended only to facilitate and clarify the illustration of the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structures. In particular, different figures may emphasize different aspects and sometimes use different scales.

[0020] It should be noted that the terms "first," "second," etc., used in the specification, claims, and drawings of this invention are used to distinguish similar objects in order to describe embodiments of the invention, and are not used to describe a specific order or sequence. It should be understood that such uses of terminology are interchangeable where appropriate. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] This embodiment provides an all-pass common-mode voltage conversion front-end circuit that supports multiple voltage terminals, such as... Figure 1 As shown, it includes: The signal input module is used to receive differential input signals; The mode selection module is used to select different termination input voltages according to requirements, so as to obtain the corresponding termination voltage signal using the differential input signal; The conversion control module is used to process the termination voltage signal using an operational amplifier to obtain a common-mode voltage signal.

[0022] The all-pass common-mode voltage conversion front-end circuit provided in this embodiment supports multiple terminal voltages. Through the mode selection module, the corresponding termination input voltage can be flexibly selected, thereby providing the corresponding termination voltage signal. Through the conversion control module, the termination voltage signal is processed by operational amplifier, which can ensure the high-speed all-pass transmission of the obtained common-mode voltage signal, improve the transmission reliability, and solve the problem that the existing common-mode voltage conversion front-end circuit cannot adapt to multiple terminal voltages.

[0023] Specifically, in this embodiment, the mode selection module includes multiple voltage selection branches; the first end of each voltage selection branch is connected to an input voltage, and the first end of all voltage selection branches is connected to different input voltages; the second end of all voltage selection branches is connected to the first output terminal of the signal input module through a first resistor, and the second end of all voltage selection branches is connected to the second output terminal of the signal input module through a second resistor.

[0024] Preferably, in order to enable the termination input voltage supported by the all-pass common-mode voltage conversion front-end circuit to be continuously adjustable within a certain voltage range to adapt to different application scenarios, in this embodiment, the termination input voltage connected to the first end of at least one of the voltage selection branches is a floating voltage.

[0025] In practical applications, such as Figure 2 As shown, the voltage selection branch can be constructed from switches. Figure 2Taking the all-pass common-mode voltage converter front-end circuit structure supporting multiple voltages as an example, switches S1, S2, and S3 each constitute a voltage selection branch, meaning there are a total of 3 voltage selection branches in this circuit. Specifically, the voltage selection branch containing switch S1 is grounded, meaning it receives a 0V terminal input voltage; the voltage selection branch containing switch S2 is connected to a power supply, for example, a 0.9V terminal input voltage; and the voltage selection branch containing switch S3 receives a floating voltage, for example, a voltage that is adjustable within the range of 0.4 to 0.7V.

[0026] Furthermore, in this embodiment, as Figure 2 As shown, the first end of the voltage selection branch (the voltage selection branch where switch S3 is located) connected to the floating voltage is connected to the output end of a buffer; the first input end (positive input end) of the buffer is connected to the programmable voltage PV, and the second input end (negative input end) of the buffer is connected to the output end of the buffer.

[0027] Specifically, in practical applications, the second input terminal (negative input terminal) of the buffer can be connected to the output terminal of the buffer through the third resistor R3.

[0028] And, such as Figure 2 As shown, the second terminals of switches S1, S2, and S3 serve as output terminals for terminating the input voltage, outputting the finally selected terminating input voltage vcm_in. This vcm_in is connected to the first output terminal of the signal input module via a first resistor R1, and to the second output terminal of the signal input module via a second resistor R2. The first output terminal of the signal input module outputs the received first differential input signal rx_pad_p, and the second output terminal outputs the received second differential input signal rx_pad_n. The first differential input signal rx_pad_p and the second differential input signal rx_pad_n constitute a set of differential input signals.

[0029] Preferably, in order to adapt to different termination input voltages vcm_in and ensure that the final output common-mode voltage signal is a common-mode voltage independent of the termination input voltage vcm_in, in this embodiment, the resistance value of the first resistor R1 is adjustable; the resistance value of the second resistor R2 is adjustable.

[0030] Furthermore, in this embodiment, as Figure 2As shown, the conversion control module includes an operational amplifier (OPA); the first input terminal (positive input terminal) of the OPA is connected to the first output terminal of the signal input module, and the second input terminal (negative input terminal) of the OPA is connected to the second output terminal of the signal input module; the first input terminal (positive input terminal) of the OPA is connected to the first output terminal (positive output terminal) of the OPA through a first closed-loop resistor Rv1, and the second input terminal (negative input terminal) of the OPA is connected to the second output terminal (negative output terminal) of the OPA through a second closed-loop resistor Rv2; the first output terminal (positive output terminal) of the OPA outputs a first common-mode voltage signal to_ctle_p, and the second output terminal (negative output terminal) outputs a second common-mode voltage signal to_ctle_n, wherein the first common-mode voltage signal to_ctle_p and the second common-mode voltage signal to_ctle_n are a set of common-mode voltage signals.

[0031] In practical applications, the first input terminal (positive input terminal) of the operational amplifier OPA can be connected to the first output terminal of the signal input module through the fourth resistor R4, and the second input terminal (negative input terminal) of the operational amplifier OPA can be connected to the second output terminal of the signal input module through the fifth resistor R5, so as to ensure that the signal current input to the operational amplifier OPA meets the requirements of the operational amplifier OPA.

[0032] Preferably, in order to provide a bias current loop for the operational amplifier and improve the operational amplifier's operational stability, current limiting protection and impedance matching are performed on the operational amplifier. In this embodiment, the resistance value of the first closed-loop resistor Rv1 is adjustable; the resistance value of the second closed-loop resistor Rv2 is adjustable.

[0033] Preferably, to ensure uninterrupted transmission of high-speed signals and avoid signal distortion and timing deviations, thereby improving data transmission reliability, in this embodiment, such as Figure 2 As shown, the conversion control module further includes a first capacitor C1 and a second capacitor C2; the first end of the first capacitor C1 is connected to the first output terminal of the signal input module, and the second end of the first capacitor C1 is connected to the first output terminal of the operational amplifier OPA; the first end of the second capacitor C2 is connected to the second output terminal of the signal input module, and the second end of the second capacitor C2 is connected to the second output terminal of the operational amplifier OPA.

[0034] The all-pass common-mode voltage conversion front-end circuit provided in this embodiment supports multiple terminal voltages. Regardless of the termination input voltage connected to the mode selection module, the output common-mode voltage signal is deterministic, independent of the termination input voltage, and adaptable to the common-mode voltage of the subsequent stage. This ensures all-pass transmission of high-speed signals, avoids signal distortion and timing offset, and improves data transmission reliability.

[0035] This embodiment also provides a control method for an all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals, applied to the all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals as described above, such as... Figure 3 As shown, the control method includes: S1 receives the differential input signal.

[0036] Specifically, in this embodiment, the signal input module receives differential input signals, including a first differential input signal rx_pad_p and a second differential input signal rx_pad_n.

[0037] S2 allows you to select different termination input voltages as needed, so that you can obtain the corresponding termination voltage signal using the differential input signal.

[0038] Specifically, in this embodiment, the mode selection module selects the corresponding voltage selection branch to be turned on according to the requirements, thereby connecting different termination input voltages, thereby generating a first termination voltage signal at the first output terminal of the first resistor and signal input module, and generating a second termination voltage signal at the second output terminal of the second resistor and signal input module.

[0039] Still with Figure 2 Taking the circuit structure shown as an example, when switch S1 is closed and switches S2 and S3 are open, 0V ground is connected as the terminal input voltage vcm_in; when switch S2 is closed and switches S1 and S3 are open, 0.9V power supply voltage is connected as the terminal input voltage vcm_in; when switch S3 is closed and switches S1 and S2 are open, a floating voltage of 0.4~0.7V is connected as the terminal input voltage vcm_in.

[0040] S3 processes the termination voltage signal using an operational amplifier to obtain a common-mode voltage signal.

[0041] Specifically, in this embodiment, the conversion control module performs operational amplifier processing on the termination voltage signal. By adjusting the output current of the operational amplifier OPA and the resistance values ​​of the two closed-loop resistors Rv1 and Rv2, a definite common-mode voltage signal that is independent of the termination input voltage and adapted to the subsequent stage is obtained. This includes a first common-mode voltage signal to_ctle_p and a second common-mode voltage signal to_ctle_n, thereby ensuring the full-pass transmission of high-speed signals, avoiding signal distortion and timing offset, and improving the reliability of data transmission.

[0042] Furthermore, this embodiment also provides an integrated circuit, including the all-pass common-mode voltage conversion front-end circuit that supports multiple voltages as described above.

[0043] Furthermore, in this embodiment, the integrated circuit also includes an active continuous-time linear equalizer (CTLE). The input terminal of the active continuous-time linear equalizer (CTLE) is connected to the common-mode voltage signal.

[0044] Specifically, the first input terminal of the active continuous-time linear equalizer CTLE is connected to the first common-mode voltage signal to_ctle_p, and the second input terminal of the active continuous-time linear equalizer CTLE is connected to the second common-mode voltage signal to_ctle_n.

[0045] Thus, by adding an active continuous-time linear equalizer (CTLE) to the back end of the all-pass common-mode voltage converter front-end circuit that supports multiple voltages, high-pass characteristics can be achieved using the active continuous-time linear equalizer (CTLE), and channel loss can be reduced, making the frequency response of the final output signal flat across the bandwidth.

[0046] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. In addition, different parts between embodiments can also be combined with each other, and this invention does not limit this.

[0047] This embodiment provides an all-pass common-mode voltage conversion front-end circuit and its control method, as well as an integrated circuit supporting multiple terminal voltages. The circuit includes: a signal input module for receiving differential input signals; a mode selection module for selecting different termination input voltages according to requirements, so as to obtain corresponding termination voltage signals using the differential input signals; and a conversion control module for performing operational amplifier processing on the termination voltage signals to obtain common-mode voltage signals. The mode selection module allows for flexible selection of the corresponding termination input voltage, thereby providing the corresponding termination voltage signal. The operational amplifier processing of the termination voltage signals by the conversion control module ensures high-speed all-pass transmission of the obtained common-mode voltage signal, improving transmission reliability and solving the problem that existing common-mode voltage conversion front-end circuits cannot adapt to multiple terminal voltages.

[0048] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A pass-through common-mode voltage conversion front-end circuit supporting multi-terminal voltages, characterized by, include: The signal input module is used to receive differential input signals; The mode selection module is used to select different termination input voltages according to requirements, so as to obtain the corresponding termination voltage signal using the differential input signal; The conversion control module is used to process the termination voltage signal using an operational amplifier to obtain a common-mode voltage signal.

2. The all-pass common-mode voltage conversion front-end circuit supporting multi-terminal voltages according to claim 1, characterized in that, The mode selection module includes multiple voltage selection branches; the first end of each voltage selection branch is connected to an input voltage, and the first end of all voltage selection branches is connected to different input voltages; the second end of all voltage selection branches is connected to the first output terminal of the signal input module through a first resistor, and the second end of all voltage selection branches is connected to the second output terminal of the signal input module through a second resistor.

3. The all-pass common-mode voltage conversion front-end circuit supporting multi-terminal voltages according to claim 2, characterized in that, The resistance value of the first resistor is adjustable; the resistance value of the second resistor is adjustable.

4. The all-pass common-mode voltage conversion front-end circuit supporting multi-terminal voltages according to claim 2, characterized in that, At least one of the voltage selection branches has a floating input voltage connected to the first terminal.

5. The all-pass common-mode voltage conversion front-end circuit supporting multi-terminal voltages according to claim 4, characterized in that, The first terminal of the voltage selection branch connected to the floating voltage is connected to the output terminal of a buffer; the first input terminal of the buffer is connected to a programmable voltage, and the second input terminal of the buffer is connected to the output terminal of the buffer.

6. The all-pass common-mode voltage conversion front-end circuit supporting multiple voltage terminals according to claim 1, characterized in that, The conversion control module includes an operational amplifier; the first input terminal of the operational amplifier is connected to the first output terminal of the signal input module, and the second input terminal of the operational amplifier is connected to the second output terminal of the signal input module; the first input terminal of the operational amplifier is connected to the first output terminal of the operational amplifier through a first closed-loop resistor, and the second input terminal of the operational amplifier is connected to the second output terminal of the operational amplifier through a second closed-loop resistor; the first and second output terminals of the operational amplifier output a common-mode voltage signal.

7. The all-pass common-mode voltage conversion front-end circuit supporting multi-terminal voltages according to claim 6, characterized in that, The resistance value of the first closed-loop resistor is adjustable; the resistance value of the second closed-loop resistor is adjustable.

8. The full pass common mode voltage conversion front end circuit supporting multiple voltage ends of claim 6, wherein, The conversion control module further includes a first capacitor and a second capacitor; the first end of the first capacitor is connected to the first output terminal of the signal input module, and the second end of the first capacitor is connected to the first output terminal of the operational amplifier; the first end of the second capacitor is connected to the second output terminal of the signal input module, and the second end of the second capacitor is connected to the second output terminal of the operational amplifier.

9. A control method of a full pass common-mode voltage conversion front-end circuit supporting multi-terminal voltage, applied to the full pass common-mode voltage conversion front-end circuit supporting multi-terminal voltage according to any one of claims 1-8, characterized in that, The control method includes: Receive differential input signals; Select different termination input voltages according to requirements, so as to obtain the corresponding termination voltage signal using the differential input signal; The termination voltage signal is processed by an operational amplifier to obtain a common-mode voltage signal.

10. An integrated circuit, characterized by Includes the all-pass common-mode voltage conversion front-end circuit supporting multiple terminal voltages as described in any one of claims 1 to 8.

11. The integrated circuit of claim 10, wherein, The integrated circuit also includes an active continuous-time linear equalizer; the input terminal of the active continuous-time linear equalizer is connected to the common-mode voltage signal.

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