Back gate dynamic compensation circuit for radiation resistance

Abstract

The invention discloses a back gate dynamic compensation circuit for radiation resistance, and relates to the technical field of total dose radiation resistance, and the back gate dynamic compensation circuit comprises a total dose radiation detection circuit, a dosimeter signal conversion circuit, a signal coding circuit, a digital-to-analog conversion circuit and a compensation voltage generation circuit. The dosimeter signal conversion circuit is respectively connected with the total dose irradiation detection circuit and the signal coding circuit, the digital-to-analog conversion circuit is connected with the signal coding circuit, and the digital-to-analog conversion circuit is also connected with the compensation voltage generation circuit; the total dose irradiation detection circuit is used for carrying out total dose irradiation detection and converting an accumulated dose into a total dose digital signal; the dosimeter signal conversion circuit is used for converting the total dose digital signal into a switching signal; the signal coding circuit is used for converting the switching signal into a corresponding coding signal; the digital-to-analog conversion circuit is used for generating a corresponding reference level according to the coded signal; the compensation voltage generating circuit is used for generating a compensation voltage according to a reference level.

Description

Technical Field

[0001] The present invention relates to the technical field of total dose radiation resistance, and in particular to a back-gate dynamic compensation circuit for radiation resistance. Background Art

[0002] In modern electronic devices, electronic components and circuits often face complex environmental challenges. In particular, exposure to radiation can significantly negatively impact the performance of these components and circuits. As radiation dose increases, the threshold voltage of semiconductor devices shifts, mobility decreases, and leakage current increases. These changes directly impact the switching characteristics, amplification capability, and signal transmission accuracy of the device.

[0003] While some methods exist to compensate for the effects of total radiation dose, these often have limitations. Some methods only provide static compensation and cannot effectively adjust the compensation in real time as the performance of a device or circuit changes after exposure, making them difficult to adapt to dynamic changes in radiation dose over time. Other methods require complex peripheral circuitry and calibration procedures, increasing the complexity and cost of circuit design and potentially introducing additional errors and reliability issues.

[0004] Therefore, there is an urgent need for a circuit solution that can generate a compensation voltage in real time, dynamically, and accurately based on the sensor signal of the total dose irradiation detector and apply it to the back gate of the device to effectively compensate for the performance degradation of the device or circuit caused by total dose irradiation. Summary of the Invention

[0005] The purpose of the present invention is to provide a back-gate dynamic compensation circuit for radiation resistance, which is used to solve the problem in the prior art of generating a voltage that dynamically changes with the sensing signal based on the sensing signal of the total dose irradiation detector and applying it to the back gate of the device to compensate for the performance degradation of the device or circuit caused by the total dose irradiation.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a back-gate dynamic compensation circuit for anti-radiation, comprising:

[0008] Total dose irradiation detection circuit, dosimeter signal conversion circuit, signal encoding circuit, digital-to-analog conversion circuit and compensation voltage generation circuit;

[0009] The dosimeter signal conversion circuit is respectively connected to the total dose irradiation detection circuit and the signal encoding circuit, the digital-to-analog conversion circuit is connected to the signal encoding circuit, and the digital-to-analog conversion circuit is also connected to the compensation voltage generation circuit;

[0010] The total dose irradiation detection circuit is used to perform total dose irradiation detection and convert the accumulated dose into a total dose digital signal; the dosimeter signal conversion circuit is used to convert the total dose digital signal into a switching signal; the signal encoding circuit is used to convert the switching signal into a corresponding encoding signal; the digital-to-analog conversion circuit is used to generate a corresponding reference level based on the encoding signal; and the compensation voltage generation circuit is used to generate a compensation voltage based on the reference level.

[0011] Optionally, the total dose radiation detection circuit converts the detected total radiation dose into a total dose digital signal; the total dose digital signal is a digital signal;

[0012] The dosimeter signal conversion circuit performs preliminary processing on the total dose digital signal and generates a corresponding switching signal according to the bias gear; the signal encoding circuit encodes the switching signal so that each switching signal corresponds to a corresponding digital signal and generates a corresponding reference level. The compensation voltage generating circuit generates a compensation voltage according to the reference level, and the compensation voltage is applied to the circuit to compensate for the degradation of device and circuit performance caused by total dose irradiation.

[0013] Optionally, the total radiation dose detection circuit detects the total radiation dose through a radiation sensitive unit such as a dosimeter or a ring oscillator, converts the total radiation dose into an electrical signal through a readout circuit, and converts the electrical signal into a digital signal for encoding.

[0014] Optionally, the dosimeter signal conversion circuit includes a dosimeter signal processing circuit connected in series; the total dose irradiation detection circuit inputs the total dose digital signal into each level of dosimeter signal processing circuit, and each level of input corresponds to a bias voltage gear;

[0015] The circuits at each level communicate in series through feedback signals; the dose meter signal processing circuit series is uniformly controlled by a start signal and an enable signal; the output signals of the circuits at each level are input into the signal encoding circuit for encoding processing.

[0016] Optionally, the dosimeter signal processing circuit includes at least:

[0017] A logic processing circuit and a trigger circuit; the trigger circuit includes a NAND SR trigger and a NOR SR trigger;

[0018] The logic processing circuit performs logic processing on the total dose digital signal and outputs a processing signal and a feedback signal; the trigger circuit processes the processing signal, the start signal, the enable signal and the feedback signal of the previous stage and outputs a switch signal.

[0019] Optionally, the dosimeter signal processing circuit starts a signal and an enable signal in an initial state and inputs the circuit, the NAND SR trigger outputs a high level, and when the total dose digital signal reaches a design value, after being processed by the logic processing circuit, the output processing signal is converted from a low level to a high level; the output of the NOR SR trigger is inverted from a low level to a high level, and the output switch signal is inverted from a low level to a high level;

[0020] When the dose increases, the output signal of the logic processing circuit reverses the level; when the irradiation increases to the dose of the previous level, the feedback signal reverses from a low level to a high level, the output level of the NAND SR trigger reverses, the output level of the NOR SR trigger reverses, and the switch signal reverses to a low level;

[0021] During the dosage increase process, the logic processing circuit of this stage has a level inversion again, the output of the NOR SR trigger is inverted, and the switch signal remains at a low level.

[0022] Optionally, in the dosimeter signal conversion circuit, when the input signal of the first-stage dosimeter signal processing circuit reaches the corresponding dose signal, the output switch signal of the first stage is reversed from a low level to a high level;

[0023] When the input signal of the second-stage circuit reaches the corresponding dosage signal, the output switch signal of the first stage reverses its level, and the output switch signal of the second stage reverses from a low level to a high level; after each subsequent stage reaches the corresponding dosage signal, the switch signal level of the previous stage reverses from a high level to a low level, and the switch signal of this stage reverses from a low level to a high level.

[0024] Optionally, the signal encoding circuit encodes the output signal of the dosimeter signal conversion circuit, and the encoded signal cooperates with the digital-to-analog conversion circuit to generate a reference voltage; the reference voltage changes with the change of the dose; each level of the switching signal corresponds to an N-bit encoded signal.

[0025] Optionally, the compensation voltage generating circuit includes a voltage stabilization control circuit and a charge pump; the voltage stabilization control circuit is used to control the output voltage of the charge pump;

[0026] The voltage stabilization control circuit includes a comparator, a selector, and a voltage divider feedback circuit; the comparator generates a control signal by comparing a reference voltage and a feedback voltage to control the positive clock input and the negative clock input of the charge pump; when the output voltage does not reach the designed voltage, the comparator controls the selector to connect to the clock source, and the charge pump starts charging;

[0027] When the designed voltage is reached, the comparator controls the selector to be connected, the other port of the selector is grounded, and the transmission gate is opened, and the positive clock input and the negative clock input are all grounded.

[0028] Optionally, the dosimeter signal conversion circuit, the signal encoding circuit, and the digital-to-analog conversion circuit all need to be designed for radiation hardening, and the radiation hardening design includes using H-gate and other layout design hardening and using SOI devices or DSOI devices for design;

[0029] The back-gate bias voltage output by the system is applied to the back-gate lead-out port of the circuit for radiation hardening; or a separate back-gate bias is applied only to sensitive nodes.

[0030] Compared with the prior art, the present invention provides a back-gate dynamic compensation circuit for radiation resistance. It includes a total dose irradiation detection circuit, a dosimeter signal conversion circuit, a signal encoding circuit, a digital-to-analog conversion circuit, and a compensation voltage generation circuit; the dosimeter signal conversion circuit is respectively connected to the total dose irradiation detection circuit and the signal encoding circuit, the digital-to-analog conversion circuit is connected to the signal encoding circuit, and the digital-to-analog conversion circuit is also connected to the compensation voltage generation circuit; the total dose irradiation detection circuit is used to perform total dose irradiation detection and convert the accumulated dose into a total dose digital signal; the dosimeter signal conversion circuit is used to convert the total dose digital signal into a switch signal; the signal encoding circuit is used to convert the switch signal into a corresponding encoding signal; the digital-to-analog conversion circuit is used to The invention relates to a back-gate dynamic compensation circuit, which is used to generate a corresponding reference level according to the coding signal; the compensation voltage generating circuit is used to generate a compensation voltage according to the reference level; the compensation voltage changes dynamically with the irradiation dose, and the compensation accuracy changes according to the number of dose meter signal processing circuits connected in series; the compensation voltage is generated by a charge pump, and the maximum output voltage is adjustable. The voltage stabilization circuit realizes voltage stabilization by controlling the charge pump input clock signal; by combining the total dose detection and radiation protection together, the back-gate dynamic compensation circuit can monitor the total dose changes in the radiation environment in real time, and automatically adjust the back-gate bias voltage to dynamically compensate the semiconductor device, thereby improving the performance stability and reliability of the device in the total dose irradiation environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 A structural diagram of a back-gate dynamic compensation circuit for anti-radiation provided by the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the dose meter signal conversion circuit provided by the present invention;

[0034] Figure 3 A schematic diagram of the structure of a dosimeter signal processing circuit provided by the present invention;

[0035] Figure 4 A circuit timing diagram of the dose meter signal processing circuit provided by the present invention;

[0036] Figure 5 A circuit timing diagram of the dose meter signal conversion circuit provided by the present invention;

[0037] Figure 6 This is a schematic diagram of the compensation voltage generating circuit structure provided by the present invention.

[0038] Reference numerals:

[0039] 100-Total dose irradiation detection circuit, 101-Dosimeter signal conversion circuit, 102-Signal encoding circuit, 103-Digital-to-analog conversion circuit, 104-Compensation voltage generation circuit, 201-Dosimeter signal processing circuit, 301-Logic processing circuit, 302-NAND SR trigger, 303-NOR SR trigger, 600-Voltage regulation control circuit, 601-Charge pump, 602-Comparator, 603-Selector, 606-Voltage divider feedback circuit. DETAILED DESCRIPTION

[0040] To facilitate a clear description of the technical solutions of the embodiments of the present invention, the embodiments of the present invention use terms such as "first" and "second" to distinguish between identical or similar items with substantially the same functions and effects. For example, the first threshold and the second threshold are merely used to distinguish between different thresholds and do not limit their order. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that terms such as "first" and "second" do not necessarily define differences.

[0041] It should be noted that, in the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present invention should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0042] In the present invention, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b and c, where a, b, c can be single or multiple.

[0043] In the prior art, Milovan et al. proposed a fully integrated, compact body-bias generator (BBG) in 2016. The BBG consists of two main building blocks. The driver unit receives four 1-bit digital commands from the control unit to trigger or disable the charging and discharging of the transistor well. The nwell driver is a PMOS and NMOS power switch with a 0V-1.8V range and a high slew rate. The positive voltage of the nwell is provided by a DAC, requiring an additional 1.8V supply for the I / O. The negative voltage of the pwell is provided by a charge pump. Through continuous detection, control, and adjustment, the back-bias voltage is automatically adjusted according to the regulated digital core circuit. The control unit operates between two main modes: ON mode and hold mode. In ON mode, the body-bias sensor is a DC voltage sampling and comparison circuit with a clock frequency of 1 or 2 GHz, enabling sub-nanosecond closed-loop control of the driver unit. The pwell sensor uses a switched capacitor structure with a voltage range of -1V to 0.8V. The output of the rail-to-rail comparator is used to generate the charge or discharge command. Once the voltage stabilizes within the specified limits, the control unit switches to a low-power stabilization mode with a 0.5MHz clock.

[0044] The solutions in the existing technology have a small back bias voltage and cannot meet the large bias voltage requirement for radiation resistance within the power supply voltage; the high-frequency clock is greatly affected by radiation; and it cannot be used in conjunction with a dosimeter.

[0045] In order to solve the problems in the prior art, the present invention provides a back-gate dynamic compensation circuit for anti-irradiation. Next, the solution provided by the embodiment of this specification is described in conjunction with the accompanying drawings:

[0046] like Figure 1 As shown, the present invention provides a back-gate dynamic compensation circuit for anti-irradiation, which may include:

[0047] A total dose irradiation detection circuit 100 , a dosimeter signal conversion circuit 101 , a signal encoding circuit 102 , a digital-to-analog conversion circuit 103 and a compensation voltage generation circuit 104 .

[0048] The dosimeter signal conversion circuit 101 is connected to the total dose irradiation detection circuit 100 and the signal encoding circuit 102 respectively, the digital-to-analog conversion circuit 103 is connected to the signal encoding circuit 102, and the digital-to-analog conversion circuit 103 is also connected to the compensation voltage generation circuit 104;

[0049] The total dose irradiation detection circuit 100 is used to perform total dose irradiation detection and convert the accumulated dose into a total dose digital signal; the dosimeter signal conversion circuit 101 is used to convert the total dose digital signal into a switching signal; the signal encoding circuit 102 is used to convert the switching signal into a corresponding encoding signal; the digital-to-analog conversion circuit 103 is used to generate a corresponding reference level according to the encoding signal; and the compensation voltage generation circuit 104 is used to generate a compensation voltage according to the reference level.

[0050] Among them, the total dose irradiation detection circuit 100 is the starting part of the entire anti-irradiation back-gate dynamic compensation circuit, and its main function is to detect the total dose irradiation situation. In a radiation environment, semiconductor devices will be irradiated by various rays (such as gamma rays, neutrons, etc.), which will gradually accumulate inside the device, causing a total dose effect. Usually, the total dose irradiation detection circuit will contain some radiation-sensitive components, such as detectors made of semiconductor materials. When the rays irradiate these sensitive components, it will cause the electrical properties (such as resistivity) inside the material to change. By monitoring these changes, the current total dose irradiation intensity can be known.

[0051] The function of the dosimeter signal conversion circuit 101 is to convert the signal from the total dose irradiation detection circuit 100 into a form that is convenient for subsequent processing. This is because the signal output by the total dose irradiation detection circuit 100 may be relatively weak, or the signal form (such as the amplitude and frequency characteristics of the current signal or voltage signal) is not convenient for direct processing.

[0052] The signal encoding circuit 102 encodes the converted signal. The purpose of encoding is to convert the analog signal into a digital signal, or to convert the signal into a specific encoding format for easy transmission and further processing.

[0053] The digital-to-analog conversion circuit 103 is used to convert a signal back into an analog signal after encoding. This requires a digital-to-analog conversion circuit. This is because the subsequent compensation voltage generation circuit may require an analog signal to generate the corresponding compensation voltage. For example, the digital-to-analog conversion circuit can convert the previously encoded binary digital signal into a corresponding voltage or current signal. If the encoded digital signal represents different levels of radiation intensity, the digital-to-analog conversion circuit will output the corresponding analog voltage value. This analog voltage value can reflect the intensity of the current total dose radiation and provide a reference signal for subsequent compensation operations.

[0054] The compensation voltage generation circuit 104 is a key component of the entire radiation-resistant back-gate dynamic compensation circuit. Its purpose is to generate a compensation voltage based on the signals processed by the previous circuits. The compensation voltage is used to counteract the effects of radiation on the back gate (usually an electrode that plays a control role in the semiconductor device structure). In a radiation environment, the performance of the back gate may be affected by the total radiation dose, such as a shift in the threshold voltage. The compensation voltage generation circuit generates a corresponding compensation voltage based on the information about the radiation conditions provided by the previous circuits. This compensation voltage, applied to the back gate, can offset or mitigate performance changes caused by radiation, thereby improving the stability and reliability of the semiconductor device in the radiation environment. For example, when radiation causes the threshold voltage of the back gate to decrease, the compensation voltage generation circuit can generate a compensation voltage of appropriate magnitude to restore the threshold voltage of the back gate to the normal operating range.

[0055] This radiation-resistant back-gate dynamic compensation circuit is designed to improve the working performance of semiconductor devices in radiation environments. Through the coordinated work of various circuit parts, it monitors, converts and processes radiation signals in real time and generates corresponding compensation measures.

[0056] Figure 1The circuit includes a total dose irradiation detection circuit 100, a dosimeter signal conversion circuit 101, a signal encoding circuit 102, a digital-to-analog conversion circuit 103 and a compensation voltage generating circuit 104; the dosimeter signal conversion circuit 101 is respectively connected to the total dose irradiation detection circuit 100 and the signal encoding circuit 102, the digital-to-analog conversion circuit 103 is connected to the signal encoding circuit 102, and the digital-to-analog conversion circuit 103 is also connected to the compensation voltage generating circuit 104; the total dose irradiation detection circuit 100 is used to perform total dose irradiation detection and convert the accumulated dose into a total dose digital signal; the dosimeter signal conversion circuit 101 is used to convert the total dose digital signal into a switch signal; the signal encoding circuit 102 is used to convert The switching signal is converted into a corresponding coding signal; the digital-to-analog conversion circuit 103 is used to generate a corresponding reference level according to the coding signal; the compensation voltage generating circuit 104 is used to generate a compensation voltage according to the reference level; the compensation voltage changes dynamically with the irradiation dose, and the compensation accuracy changes according to the number of dose meter signal processing circuits in series; the compensation voltage is generated by a charge pump, the maximum output voltage is adjustable, and the voltage stabilization circuit achieves voltage stabilization by controlling the charge pump input clock signal; by combining the total dose detection and radiation protection together, the back gate dynamic compensation circuit can monitor the total dose changes in the radiation environment in real time, and automatically adjust the back gate bias voltage to dynamically compensate the semiconductor device, thereby improving the performance stability and reliability of the device in the total dose irradiation environment.

[0057] based on Figure 1 The embodiments of this specification also provide some specific implementation structures of the circuit, which are described below.

[0058] As an optional embodiment, the total dose irradiation detection circuit 100 converts the detected total irradiation dose into a total dose digital signal 100A, and inputs the signal into the dosimeter signal conversion circuit 101. The dosimeter signal conversion circuit 101 performs preliminary processing on the input total dose digital signal 100A, and generates a corresponding first switching signal 101A according to the designed bias gear. The signal encoding circuit 102 encodes these first switching signals 101A so that each first switching signal 101A has a corresponding N-bits digital encoding signal 102A. This N-bits encoding signal 102A is input into the N-bit digital-to-analog conversion circuit 103 to generate a corresponding reference voltage 103A. The compensation voltage generation circuit 104 generates a compensation voltage based on the reference voltage 103A, and applies it to the circuit to compensate for the degradation of device and circuit performance caused by total dose irradiation.

[0059] The above content describes in detail the working process and functions of each part of a radiation-resistant back-gate dynamic compensation circuit. The following is a detailed explanation:

[0060] Total radiation dose detection circuit 100 monitors and detects the total radiation dose of the circuit's environment in real time, converting the detected total radiation dose information into a total dose digital signal 100A. This provides critical basic data for subsequent compensation operations. Only by accurately obtaining the total radiation dose can targeted compensation be performed to ensure stable operation of the circuit in the irradiated environment.

[0061] Dosimeter signal conversion circuit 101 receives digital total dose signal 100A from the total dose detection circuit, performs preliminary signal processing, and generates a corresponding first switching signal 101A based on the designed bias position. Different bias positions correspond to different radiation condition handling strategies. By converting the digital signal into a switching signal, a preliminary response to different radiation intensities is achieved, paving the way for subsequent, more refined signal processing.

[0062] Signal encoding circuit 102 encodes first switching signal 101A generated in the previous step, converting each switching signal into an N-bit coded signal 102A. The encoding process digitizes and standardizes the signal, enabling it to be transmitted and processed in a unified digital format in subsequent circuits. This facilitates compatibility with digital systems and improves the accuracy and reliability of signal processing.

[0063] Digital-to-analog conversion circuit 103 receives N-bits encoded signal 102A and converts it into a corresponding reference voltage 103A. Digital-to-analog conversion is the process of converting a digital signal into an analog signal. The generation of a reference voltage provides an analog basis for the subsequent generation of a compensation voltage. This conversion of digital information into a specific analog level achieves the transition from the digital to analog domain, meeting the signal requirements of the analog portion of the circuit.

[0064] Compensation voltage generation circuit 104 generates a compensation voltage based on reference voltage 103A and applies it to the circuit. The compensation voltage is used to offset or mitigate the degradation of device and circuit performance caused by total radiation dose. By precisely adjusting the compensation voltage, the circuit maintains near-normal operating performance under radiation, ensuring circuit stability and reliability. This is a key component of the entire radiation-resistant back-gate dynamic compensation circuit.

[0065] In addition, the total dose radiation detection circuit 100 can detect the total radiation dose through a radiation sensitive unit such as a dosimeter or a ring oscillator, and then convert the total radiation dose into an electrical signal through a readout circuit, and then convert the electrical signal into a total dose digital signal 100A through a unit such as an analog-to-digital conversion circuit and then hand it over to the processing circuit for encoding.

[0066] Furthermore, the dose meter signal conversion circuit 101 is as follows Figure 2As shown, it is mainly composed of a series of dosimeter signal processing circuits 201. The total dose irradiation detection circuit 100 inputs the total dose digital signal 100A into each level of dosimeter signal processing circuits 201. Each level of input (200A, 200B and 200C) corresponds to a bias voltage gear.

[0067] Each level of the dosimeter signal processing circuits 201 communicates in series via feedback signals (202A, 202B, and 202C). The dosimeter signal processing circuits 201 are collectively controlled by a start signal 105 and an enable signal 106. The output switching signals (201A, 201B, and 201C) from each level of the dosimeter signal processing circuits 201 are input into the signal encoding circuit 102 for encoding.

[0068] The above describes the internal structure and operation of the dosimeter signal conversion circuit 101. More specifically, the dosimeter signal conversion circuit 101 primarily comprises a plurality of serially arranged dosimeter signal processing circuits 201. This serial structure allows the circuit to process input signals in stages, with each stage dedicated to processing a specific range or type of signal.

[0069] The total dose irradiation detection circuit 100 converts the detected total dose information into a total dose digital signal 100A, which is input into the various stages of the dosimeter signal processing circuit 201 of the dosimeter signal conversion circuit 101. This multi-stage input method enables the circuit to process dose signals of different intensities or types.

[0070] Each input of the dosimeter signal processing circuit 201 (e.g., 200A, 200B, and 200C) corresponds to a bias voltage level, which means that each processing circuit can process signals for different bias voltages, thereby improving the circuit's adaptability to different irradiation conditions.

[0071] Each level of the dosimeter signal processing circuit 201 communicates serially with each other via feedback signals (e.g., 202A, 202B, and 202C). This feedback mechanism enables the circuit to dynamically adjust its processing mode, ensuring the consistency and accuracy of signal processing. The feedback signal can help the circuit self-correct during processing, improving processing efficiency and accuracy.

[0072] The entire dosimeter signal processing circuit 201 is controlled by the start signal 105 and the enable signal 106. These two signals work together to ensure that the circuit starts at the appropriate time and processes signals according to the predetermined logic, thus ensuring the synchronization and coordination of the circuit operation.

[0073] The output switching signals (e.g., 201A, 201B, and 201C) from each level of the dosimeter signal processing circuit 201 are input to the signal encoding circuit 102 for encoding. The encoding process converts these signals into a unified digital format, facilitating subsequent signal transmission and processing while also improving signal reliability and anti-interference capabilities.

[0074] In summary, the structure and workflow of the dosimeter signal conversion circuit reflect careful consideration and effective design of complex signal processing requirements. Through multi-level processing, feedback mechanism and unified control, it ensures that various radiation signals can be processed efficiently and accurately in the radiation-resistant circuit.

[0075] As an optional embodiment, the structure of the dose meter signal processing circuit 201 is as follows: Figure 3 As shown, it mainly consists of a logic processing circuit 301, a NAND SR trigger 302, a NOR SR trigger 303 and other circuits. The logic processing circuit 301 performs logic processing on the total dose digital signal 100A and outputs a processed signal 301A and a first feedback signal 301B.

[0076] The trigger circuit includes a NAND SR trigger 302 and a NOR SR trigger 303 . The trigger circuit processes the output processing signal 301A, the start signal 105 , the enable signal 106 and the second feedback signal 202 of the previous stage, and then outputs a second switching signal 304 .

[0077] The above describes the internal structure and operating principles of the dosimeter signal processing circuit 201. Specifically, the dosimeter signal processing circuit 201 includes at least a logic processing circuit 301, a NAND SR flip-flop 302, a NOR SR flip-flop 303, and other circuits. These components work together to process and convert input signals.

[0078] The logic processing circuit is one of the core components of the dosimeter's signal processing circuitry. It is primarily responsible for performing logical processing on the input digital total dose signal 100A. It analyzes and converts the input signal through a series of logical operations (such as AND, OR, and NOT) to extract useful information.

[0079] The processed signal 301A is a signal that has been processed by logic and is used for subsequent trigger circuit processing. The first feedback signal 301B is used to communicate with other dosimeter signal processing circuits 201 to ensure the consistency and accuracy of signal processing.

[0080] The trigger circuit includes a NAND SR trigger 302 and a NOR SR trigger 303, which play the role of signal storage and state control in the circuit. The trigger circuit receives multiple input signals and outputs a corresponding second switch signal 304 according to the state of these signals.

[0081] Input signals can include processing signals, start signals, and enable signals. Processing signal 301A is the output signal from the logic processing circuit. Start signal 105 is used to initiate the operation of the entire dosimeter signal processing circuit. Enable signal 106 is used to enable or disable the trigger circuit and control its operating state. The previous-stage second feedback signal 202, a feedback signal from the previous-stage dosimeter signal processing circuit, is used to dynamically adjust and correct the processing process of the current circuit.

[0082] The output signal may include a second switch signal 304: according to the state of the input signal, the trigger circuit outputs a corresponding switch signal. These switch signals will be input into the signal encoding circuit 102 for further encoding processing.

[0083] The logic processing circuit 301 receives the total dose digital signal 100A, performs logic processing on it, extracts useful information, and generates a processed signal 301A and a first feedback signal 301B.

[0084] Trigger processing stage: The processing signal 301A is input to the trigger circuit. At the same time, the trigger circuit also receives the start signal 105, the enable signal 106, and the second feedback signal 202 from the previous stage. These signals together determine the output state of the trigger circuit.

[0085] Output stage: The trigger circuit outputs the corresponding second switch signal 304 according to the state of the input signal. These switch signals will be transmitted to the signal encoding circuit 102 for the next encoding process.

[0086] The dosimeter signal processing circuit 201, through the collaborative operation of the logic processing circuit and trigger circuit, implements logical processing and state control of the total dose digital signal. It not only extracts useful information but also communicates with other circuits through a feedback mechanism, ensuring that the entire system operates stably and accurately in complex irradiation environments.

[0087] Furthermore, the timing diagram of the dosimeter signal processing circuit 201 is as follows: Figure 4 As shown, Figure 4 In the initial state (400A), the start signal 105 and the enable signal 106 are input to the circuit, and at this time, the output (302A) of the NAND SR flip-flop 302 outputs a first high level (404A).

[0088] When the total dose digital signal 100A output by the total dose irradiation detection circuit 100 reaches the design value (400B), after being processed by the logic processing circuit 301, the output processing signal 301A is converted from a low level to a second high level (401A), and the first feedback signal 301B also changes accordingly. The output (303A) of the NOR SR trigger 303 is inverted from a low level to a third high level (405A), and the output second switching signal 304 is inverted from a low level to a fourth high level (406A).

[0089] After the dose increases (400C), the output processing signal 301A of the logic processing circuit 301 reverses its level; when the irradiation increases to the dose of the previous level (400D), the second feedback signal 202 reverses from the low level to the fifth high level (403), the output (302A) of the NANDSR trigger 302 reverses its level (404B), the output (303A) of the NOR SR trigger 303 also reverses its level (405B), and the second switch signal 304 reverses to a low level (406B).

[0090] When the dose increases (400E), the logic processing circuit 301 of this stage undergoes a level inversion again (401B), and the output (303A) of the NOR SR flip-flop 303 is inverted (405C), but the second switch signal 304 remains at a low level (406C), which does not affect the encoded output.

[0091] The overall timing diagram of the dose meter signal conversion circuit 101 is as follows: Figure 5 As shown, Figure 5 In the embodiment, when the input signal (200A) of the first-stage dose meter signal processing circuit 201 reaches the corresponding dose signal (501A) (500A), the output switch signal (201A) of the first stage is reversed from a low level to a high level; when the input signal (200B) of the second-stage circuit reaches the corresponding dose signal (501B) (500B), the first-stage output switch signal (201A) reverses its level, and the second-stage output switch signal (201B) reverses from a low level to a high level; similarly, in each subsequent stage, after reaching the corresponding dose signal, the switch signal level of the previous stage is reversed from a high level to a low level, and the switch signal of the current stage is reversed from a low level to a high level.

[0092] Signal encoding circuit 102 encodes the output signal of dosimeter signal conversion circuit 101. Encoded signal 102A, in conjunction with digital-to-analog conversion circuit 103, generates a reference voltage 103A. Reference voltage 103A changes with dose, meaning that each stage's output switching signal (201A, 201B, 201C) corresponds to an N-bit encoded signal 102A.

[0093] The structure of the compensation voltage generating circuit 104 is as follows: Figure 6 As shown, it mainly includes a voltage stabilization control circuit 600 and a charge pump 601.

[0094] The voltage stabilization control circuit 600 is responsible for controlling the output voltage ( 605 ) of the charge pump 601 . The voltage stabilization control circuit 600 includes a comparator 602 , a selector 603 , and a voltage divider feedback circuit 606 .

[0095] The comparator 602 generates a control signal (602A) by comparing the reference voltage 103A and the feedback voltage (606A) to control whether the positive clock input (603A) and the negative clock input (603B) of the charge pump 601 are connected to the clock source (109) or the ground.

[0096] The above content introduces the internal structure and operating principle of the compensation voltage generating circuit 104. More specifically, the compensation voltage generating circuit mainly consists of a voltage stabilization control circuit 600 and a charge pump 601. These two components work together to generate and regulate the compensation voltage to ensure stable operation of the circuit under radiation environment.

[0097] The voltage stabilization control circuit is the core of the compensation voltage generation circuit and is responsible for accurately controlling the output voltage of the charge pump 601. It consists of a comparator 602, a selector 603, and a voltage divider feedback circuit 606.

[0098] The comparator receives two input signals: a reference voltage 103A and a feedback voltage (606A). It compares these two voltage signals and generates a control signal (602A). This control signal (602A) reflects the difference between the reference voltage and the actual output voltage, providing a basis for subsequent voltage regulation.

[0099] The selector determines whether the positive clock input (603A) and the negative clock input (603B) of the charge pump 601 are connected to the clock source (109) or grounded according to the state of the control signal (602A). Specifically, when the control signal (602A) indicates that the output voltage needs to be increased, the selector connects the positive clock input (603A) and the negative clock input (603B) to the clock source (109), providing an operating clock signal to the charge pump so that it can increase the output voltage. When the control signal (602A) indicates that the output voltage needs to be reduced, the selector connects the positive clock input (603A) and the negative clock input (603B) to the ground, stops the input of the clock signal, and stops the charge pump from performing the voltage boost operation, thereby reducing the output voltage.

[0100] The voltage divider feedback circuit 606 divides the output voltage (605) of the charge pump 601 to generate a feedback voltage (606A). This feedback voltage (606A) is fed back to the comparator 602 for comparison with the reference voltage 103A, forming a closed-loop control circuit to ensure the stability and accuracy of the output voltage (605).

[0101] The charge pump 601 is a common DC-DC conversion circuit that can convert an input voltage into a higher or lower output voltage through the principles of capacitor energy storage and charge transfer. In this circuit, the main function of the charge pump 601 is to adjust its output voltage (605) according to the control signal of the voltage stabilization control circuit 600 to generate the required compensation voltage. The charge pump 601 receives a clock signal (connected or disconnected through the selector 603) and performs voltage conversion operations according to the working state of the clock signal. The output voltage (605) is the final output of the charge pump 601, which is applied to the circuit that needs compensation to offset the performance degradation of the device and circuit caused by the total dose irradiation.

[0102] Comparator 602 compares the reference voltage 103A and the feedback voltage (606A) in real time. The reference voltage 103A comes from the digital-to-analog conversion circuit 103 and reflects the ideal compensation voltage value calculated based on the total dose irradiation situation. The feedback voltage (606A) is obtained from the output voltage (605) of the charge pump 601 by the voltage divider feedback circuit 606 and represents the current actual output voltage situation. Based on the comparison result, comparator 602 generates a control signal (602A). This control signal directly determines the action of selector 603, thereby controlling the working state of charge pump 601. If the actual output voltage is lower than the reference voltage, it means that the output voltage needs to be increased, and the selector connects the clock source (109) to the charge pump; conversely, if the actual output voltage is higher than the reference voltage, the selector disconnects the clock input (grounds it), causing the charge pump to stop boosting. The charge pump 601 performs the corresponding voltage conversion operation based on whether there is a clock signal input. When a clock signal is present, the charge pump gradually increases the output voltage through the internal capacitor charging and discharging process. When a clock signal is absent, the charge pump stops boosting, and the output voltage gradually stabilizes at its current value or slightly decreases due to factors such as load. The voltage divider feedback circuit 606 continuously feeds back a portion of the output voltage (605) of the charge pump 601 to the comparator 602, forming a closed-loop control. This process is repeated continuously, allowing the output voltage (605) to dynamically track and match the target value set by the reference voltage 103A, thereby achieving accurate compensation voltage output.

[0103] The compensation voltage generation circuit achieves precise regulation and stable output of the compensation voltage through the coordinated work of the voltage stabilization control circuit and the charge pump, ensuring that under the total dose irradiation environment, the circuit can effectively compensate for the performance degradation caused by irradiation and maintain normal working state.

[0104] Furthermore, when the output voltage (605) does not reach the design voltage, the comparator 602 controls the selector 603 to connect to the clock source (109), and the charge pump 601 starts charging. When the design voltage is reached, the comparator 602 controls the selector 603 to connect to the other port (604) of the selector to be grounded, and at the same time, the transmission gate is opened, and the positive clock input (603A) and the negative clock input (603B) are all grounded, and the output voltage (605) no longer increases.

[0105] The generated bias voltage (605) is applied to the back gate of the device or circuit to compensate for the performance degradation caused by irradiation. For different doses, the bias voltage (605) is matched with the total dose irradiation detection circuit 100 to produce corresponding changes, so as to perform more accurate compensation.

[0106] Circuits such as the dosimeter signal conversion circuit 101, the signal encoding circuit 102, and the digital-to-analog conversion circuit 103 require radiation hardening design. In addition to using H-gate and other layout design hardening, when SOI devices or DSOI devices are used to design circuits, the back gate bias voltage output by the system can also be applied to the back gate lead-out port of the circuit for radiation hardening, or a separate back gate bias can be applied only to sensitive nodes.

[0107] The present invention provides a back-gate dynamic compensation circuit for radiation resistance, which combines total dose detection and radiation resistance. The changes in the compensation circuit change with the dose, providing more accurate performance compensation reinforcement for devices and circuits, and improving the radiation resistance of devices and circuits. The charge pump serves as an output voltage power supply and can generate a compensation voltage that exceeds the power supply voltage according to actual needs. A digital voltage regulation control unit is used to control the compensation voltage faster and more accurately, and the capacitive load makes the compensation circuit power very low. The processing part in the compensation system is mostly digital circuit, which is less affected by the total dose radiation than the analog part and has a stronger ability to resist the total dose.

[0108] More specifically, the present invention provides a back-gate dynamic compensation circuit for total-dose radiation resistance. It primarily comprises: a total-dose radiation detection circuit, responsible for detecting the total-dose radiation and converting the accumulated dose into a digital signal; a dosimeter signal conversion circuit, responsible for converting the digital dose signal into a switching signal; a signal encoding circuit, responsible for converting the switching signal into a corresponding coded signal that is input into a DAC; a digital-to-analog converter (DAC), responsible for generating a corresponding reference level based on the coded signal; and a compensation voltage generation circuit, which generates a compensation voltage based on the reference level to compensate for radiation-induced performance degradation of a device or circuit.

[0109] The key technical point of the dosimeter signal conversion circuit is that it is composed of multiple dosimeter signal processing circuits in series. The number is determined by the gear position required for adjustment. According to the output of the total dose irradiation detection circuit, a switch signal is generated. When the dose required to be compensated at this level is reached, a high level is output. When the dose of the next level is reached, a low level is output without interfering with each other.

[0110] The key technical point of the compensation voltage generating circuit is to control the clock input of the charge pump by controlling the selector output, thereby controlling the output voltage. The maximum output voltage is changed by changing the number of series stages in the charge pump circuit.

[0111] The present invention seeks to protect the architecture of a proposed radiation-resistant back-gate dynamic compensation circuit. The compensation voltage varies dynamically with the radiation dose, and the compensation accuracy varies according to the number of series-connected dosimeter signal processing circuits. The compensation voltage is generated by a charge pump with an adjustable maximum output voltage, and the voltage stabilization circuit achieves this by controlling the charge pump's input clock signal. By combining total dose detection and radiation protection, the back-gate dynamic compensation circuit can monitor total dose variations in the radiation environment in real time and automatically adjust the back-gate bias voltage to dynamically compensate for semiconductor devices, thereby improving the device's performance stability and reliability in total dose radiation environments.

[0112] Although the present invention has been described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0113] Although the present invention has been described with reference to specific features and embodiments thereof, it will be apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the invention. Accordingly, this specification and drawings are merely illustrative of the invention as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the invention. It will be apparent that various modifications and variations may be made to the present invention by those skilled in the art without departing from the spirit and scope of the invention. Thus, the present invention is intended to include such modifications and variations as fall within the scope of the claims of the present invention and their equivalents.

Claims

1. A back-gate dynamic compensation circuit for anti-radiation, characterized in that: include: Total dose irradiation detection circuit, dosimeter signal conversion circuit, signal encoding circuit, digital-to-analog conversion circuit and compensation voltage generation circuit; The dosimeter signal conversion circuit is respectively connected to the total dose irradiation detection circuit and the signal encoding circuit, the digital-to-analog conversion circuit is connected to the signal encoding circuit, and the digital-to-analog conversion circuit is also connected to the compensation voltage generation circuit; The total dose irradiation detection circuit is used to perform total dose irradiation detection and convert the accumulated dose into a total dose digital signal; the dosimeter signal conversion circuit is used to convert the total dose digital signal into a switch signal; the signal encoding circuit is used to convert the switch signal into a corresponding coded signal; The digital-to-analog conversion circuit is used to generate a corresponding reference level according to the coded signal; and the compensation voltage generation circuit is used to generate a compensation voltage according to the reference level.

2. The back-gate dynamic compensation circuit for anti-radiation according to claim 1, characterized in that: The total dose radiation detection circuit converts the detected total radiation dose into a total dose digital signal; the total dose digital signal is a digital signal; The dosimeter signal conversion circuit performs preliminary processing on the total dose digital signal and generates a corresponding switch signal according to the bias gear position; The signal encoding circuit encodes the switching signal so that each switching signal corresponds to a corresponding digital signal and generates a corresponding reference level. The compensation voltage generating circuit generates a compensation voltage based on the reference level. The compensation voltage is applied to the circuit to compensate for the degradation of device and circuit performance caused by total dose irradiation.

3. The back-gate dynamic compensation circuit for anti-radiation according to claim 1, characterized in that: The total radiation dose detection circuit detects the total radiation dose through a radiation sensitive unit such as a dosimeter or a ring oscillator, converts the total radiation dose into an electrical signal through a readout circuit, and converts the electrical signal into a digital signal for encoding.

4. The back-gate dynamic compensation circuit for radiation resistance according to claim 1, characterized in that: The dosimeter signal conversion circuit includes a series-connected dosimeter signal processing circuit; the total dose irradiation detection circuit inputs the total dose digital signal into each level of dosimeter signal processing circuit, and each level of input corresponds to a bias voltage gear; The circuits at each level communicate in series through feedback signals; the dose meter signal processing circuit series is uniformly controlled by a start signal and an enable signal; the output signals of the circuits at each level are input into the signal encoding circuit for encoding processing.

5. The back-gate dynamic compensation circuit for anti-radiation according to claim 4, characterized in that: The dosimeter signal processing circuit at least includes: A logic processing circuit and a trigger circuit; the trigger circuit includes a NAND SR trigger and a NOR SR trigger; The logic processing circuit performs logic processing on the total dose digital signal and outputs a processing signal and a feedback signal; the trigger circuit processes the processing signal, the start signal, the enable signal and the feedback signal of the previous stage and outputs a switch signal.

6. The back-gate dynamic compensation circuit for anti-radiation according to claim 5, characterized in that: The dosimeter signal processing circuit starts the signal and the enable signal in the initial state and inputs the circuit, the NAND SR trigger outputs a high level, and when the total dose digital signal reaches the design value, after being processed by the logic processing circuit, the output processing signal is converted from a low level to a high level; the output of the NOR SR trigger is inverted from a low level to a high level, and the output switch signal is inverted from a low level to a high level; When the dose increases, the output signal of the logic processing circuit reverses the level; when the irradiation increases to the dose of the previous level, the feedback signal reverses from a low level to a high level, the output level of the NAND SR trigger reverses, the output level of the NOR SR trigger reverses, and the switch signal reverses to a low level; During the dosage increase process, the logic processing circuit of this stage has a level inversion again, the output of the NOR SR trigger is inverted, and the switch signal remains at a low level.

7. The back-gate dynamic compensation circuit for anti-radiation according to claim 5, characterized in that: In the dosimeter signal conversion circuit, when the input signal of the first-stage dosimeter signal processing circuit reaches the corresponding dose signal, the output switch signal of the first stage is reversed from a low level to a high level; When the input signal of the second-stage circuit reaches the corresponding dosage signal, the output switch signal of the first stage reverses its level, and the output switch signal of the second stage reverses from a low level to a high level; after each subsequent stage reaches the corresponding dosage signal, the switch signal level of the previous stage reverses from a high level to a low level, and the switch signal of this stage reverses from a low level to a high level.

8. The back-gate dynamic compensation circuit for anti-radiation according to claim 1, characterized in that: The signal encoding circuit encodes the output signal of the dosimeter signal conversion circuit, and the encoded signal cooperates with the digital-to-analog conversion circuit to generate a reference voltage; the reference voltage changes with the change of the dose; each level of the switching signal corresponds to an N-bit encoded signal.

9. The back-gate dynamic compensation circuit for anti-radiation according to claim 1, characterized in that: The compensation voltage generating circuit includes a voltage stabilizing control circuit and a charge pump; the voltage stabilizing control circuit is used to control the output voltage of the charge pump; The voltage stabilization control circuit includes a comparator, a selector, and a voltage divider feedback circuit; the comparator generates a control signal by comparing a reference voltage and a feedback voltage to control the positive clock input and the negative clock input of the charge pump; when the output voltage does not reach the designed voltage, the comparator controls the selector to connect to the clock source, and the charge pump starts charging; When the designed voltage is reached, the comparator controls the selector to be connected, the other port of the selector is grounded, and the transmission gate is opened, and the positive clock input and the negative clock input are all grounded.

10. The back-gate dynamic compensation circuit for anti-radiation according to claim 1, characterized in that: The dosimeter signal conversion circuit, the signal encoding circuit, and the digital-to-analog conversion circuit all need to be designed for radiation hardening, and the radiation hardening design includes using H-gate and other layout design hardening and using SOI devices or DSOI devices design; The back-gate bias voltage output by the system is applied to the back-gate lead-out port of the circuit for irradiation reinforcement; Alternatively, a separate back gate bias can be applied only to sensitive nodes.

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