Multi-input pulse shaping circuit based on current addition and electronic equipment

Abstract

The invention provides a multi-input pulse shaping circuit based on current addition and electronic equipment, and relates to the field of integrated circuits. The input end of each path of detection unit in the multiple paths of detection units is connected with one pixel, and the output end of each path of detection unit is connected with the input end of one path of trigger signal unit. According to the comparator circuit, the amplitude of the signal transmitted to the input end of the comparator through the summing circuit is far higher than that of the signal transmitted to the input end of the comparator through a traditional circuit structure, the threshold voltage range can be set to be high, and the comparator circuit meeting the requirement can be designed with a small area. A good measurement dynamic range can be achieved under the condition that the area of a chip is saved, and meanwhile the risk of false triggering is avoided. And tiny disturbance generated by a single pixel under the condition of no input signal cannot be detected, so that the working reliability of a chip is improved. The multi-input pulse shaping circuit structure based on current addition can enable a front-end circuit to reach an excellent dynamic range under the condition of saving the area of a comparator.

Description

Technical Field

[0001] The present invention relates to the field of integrated circuits, and in particular, to a multi-input pulse shaping circuit and an electronic device based on current addition. Background Art

[0002] At present, the first two stages of some traditional radiation detector readout circuits are composed of a charge sensitive amplifier (CSA) and a shaper. A comparator is connected to the output end of the shaper to generate a trigger signal of the circuit. The threshold of this signal trigger determines the sensitivity and dynamic range of the detector.

[0003] The trigger threshold, that is, the reference voltage at the input end of the comparator, is affected by the noise of the front-end circuit, the noise and offset of the comparator. If the trigger threshold range is set too small, the circuit will have a high risk of false triggering. If the trigger threshold range is set too large, the dynamic range of the circuit will be greatly reduced. In the pixel-type radiation detector circuit, the performance of the comparator is limited by the pixel area, thus affecting the performance of the entire circuit. Summary of the Invention

[0004] In view of the above problems, the present invention is proposed to provide a multi-input pulse shaping circuit and an electronic device based on current addition to solve or partially solve the above problems.

[0005] In the first aspect of the embodiments of the present invention, a multi-input pulse shaping circuit based on current addition is provided. The multi-input pulse shaping circuit includes: a multi-channel detection unit and a trigger signal unit;

[0006] The input end of each detection unit in the multi-channel detection unit is connected to a pixel, and the output end of each detection unit is connected to the input end of the trigger signal unit;

[0007] The multi-channel detection unit is configured to perform current detection on the pixel connected to each detection unit, generate corresponding radiation signals, and add the radiation signals output by all detection units to obtain a total radiation signal and output it to the trigger signal unit;

[0008] The trigger signal unit is configured to process the total radiation signal to obtain a trigger signal, and the trigger signal is used to trigger the output and reset of the multi-input pulse shaping circuit.

[0009] Optionally, the output end of each detection unit in the multi-channel detection unit is connected to the input end of the trigger signal unit through a branch capacitor;

[0010] Among them, the output end of each path of detection unit is connected to the first electrode plate of a branch capacitor, and the second electrode plate of the branch capacitor is connected to the second electrode plates of other branch capacitors and then connected to the input end of one path of trigger signal unit.

[0011] Optionally, the one path of trigger signal unit includes: a trigger unit shaper and a trigger signal generation structure;

[0012] The input end of the trigger unit shaper is connected to the second electrode plate of each branch capacitor to receive the total radiation signal;

[0013] The output end of the trigger unit shaper is connected to the input end of the trigger signal generation structure, and the output end of the trigger signal generation structure outputs the trigger signal.

[0014] Optionally, the branch capacitor is used to filter the radiation signal generated by each path of detection unit;

[0015] The trigger unit shaper is used to shape the total radiation signal;

[0016] The trigger signal generation structure is used to process the shaped total radiation signal to obtain the trigger signal.

[0017] Optionally, the trigger signal generation structure includes: a trigger unit comparator, a trigger unit capacitor, and a reset unit;

[0018] The first electrode plate of the trigger unit capacitor is connected to the output end of the trigger unit shaper;

[0019] The second electrode plate of the trigger unit capacitor is respectively connected to the inverting end of the trigger unit comparator and the reset unit;

[0020] The non-inverting end of the trigger unit comparator receives the threshold voltage;

[0021] The output end of the trigger unit comparator outputs the trigger signal;

[0022] Among them, the trigger unit capacitor is used to filter the total radiation signal;

[0023] The trigger unit comparator is used to compare the filtered total radiation signal with the threshold voltage, and generate and output the trigger signal according to the comparison result.

[0024] Optionally, the trigger signal generation structure includes: a trigger unit comparator, a trigger unit capacitor, a latch, and a reset unit;

[0025] The first electrode plate of the trigger unit capacitor is connected to the output end of the trigger unit shaper;

[0026] The second plate of the trigger unit capacitor is connected to the inverting terminal of the trigger unit comparator and the reset unit respectively;

[0027] The non-inverting terminal of the trigger unit comparator receives a threshold voltage;

[0028] The output terminal of the trigger unit comparator is connected to the input terminal of the latch;

[0029] The output terminal of the latch outputs the trigger signal;

[0030] Wherein, the trigger unit capacitor is used for filtering the total radiation signal;

[0031] The trigger unit comparator is used for comparing the filtered total radiation signal with the threshold voltage and generating the trigger signal according to the comparison result;

[0032] The latch is used for latching and outputting the trigger signal.

[0033] Optionally, each detection unit includes: a charge sensitive amplifier and its feedback structure, and the feedback structure is connected between the input terminal and the output terminal of the charge sensitive amplifier;

[0034] The input terminal of the charge sensitive amplifier is connected to a pixel, and the output terminal is connected to the input terminal of the one-way trigger signal unit.

[0035] Optionally, the multi-input pulse shaping circuit further includes: a multi-way radiation signal shaper and a multi-way peak detection and holding unit;

[0036] The output terminal of each detection unit is connected to the input terminal of one of the multi-way radiation signal shapers through a signal capacitor;

[0037] The output terminal of each of the multi-way radiation signal shapers is connected to one of the multi-way peak detection and holding units.

[0038] Optionally, when performing layout drawing, adjacent multiple pixels are taken as a cluster, and all detection units corresponding to all pixels in the cluster share one-way trigger signal unit.

[0039] A second aspect of the embodiments of the present invention provides an electronic device, and the electronic device includes: a multi-input pulse shaping circuit according to any one of the first aspect.

[0040] The multi-input pulse shaping circuit provided by the present invention includes: a multi-channel detection unit and a trigger signal unit. The input end of each detection unit in the multi-channel detection unit is connected to a pixel, and the output end of each detection unit is connected to the input end of the trigger signal unit.

[0041] The multi-channel detection unit is used for each detection unit to detect the current of the pixel connected thereto, generate a corresponding radiation signal, and add up the radiation signals output by all detection units to obtain a total radiation signal and output it to the trigger signal unit; the trigger signal unit is used for processing the total radiation signal to obtain a trigger signal, and this trigger signal is used to trigger the output and reset of the multi-input pulse shaping circuit.

[0042] The multi-input pulse shaping circuit proposed by the present invention creatively proposes a multi-input pulse shaping circuit based on current addition. It is creatively proposed that the radiation signal detected by the current sense amplifier is divided into two paths. One path is the same as the traditional structure: after passing through the shaper and the peak detection and hold circuit (PDH), it is used as an analog output; the other path is taken out and shares a trigger signal unit with the radiation signals detected by other current sense amplifiers to generate a trigger signal. The entire circuit uses a multi-input pulse shaper based on current addition to achieve the effect of cluster triggering. The signal amplitude transmitted to the input end of the comparator by the adder circuit is much higher than that of the traditional circuit structure. Therefore, the threshold voltage range can be set relatively high. At this time, even if the noise and offset of the comparator are relatively large, it will not cause false triggering, and a comparator circuit that meets the requirements can be designed with a smaller area, achieving high sensitivity and avoiding the excessive area of the comparator.

[0043] The multi-input pulse shaping circuit structure proposed by the present invention can achieve a good measurement dynamic range while saving chip area, and there is no risk of false triggering. Since multiple pixels share a trigger signal generation unit, another advantage is that the number of control signals is reduced to 1 / n of the original, reducing the area cost of the chip. At the same time, the small perturbation generated by a single pixel without an input signal will not be detected, increasing the reliability of the chip operation. The multi-input pulse shaping circuit structure based on current addition can make the front-end circuit reach an excellent dynamic range while saving the area of the comparator. Therefore, the multi-input pulse shaping circuit proposed by the present invention has high practicability. Description of the Drawings

[0044] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0045] Figure 1 is a schematic diagram of the structure of a traditional radiation detector readout circuit;

[0046] Figure 2 is a modular schematic diagram of a multi-input pulse shaping circuit based on current summation according to an embodiment of the present invention;

[0047] Figure 3 is a schematic diagram of the structure of a preferred multi-input pulse shaping circuit according to an embodiment of the present invention;

[0048] Figure 4 is a schematic diagram of the overall architecture of a preferred multi-input pulse shaping circuit according to an embodiment of the present invention. Specific Embodiments

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0050] The inventors found that the first two stages of a traditional radiation detector readout circuit consist of a charge sensitive amplifier (CSA) and a shaper. A comparator is connected to the output of the shaper to generate a trigger signal for the circuit. The threshold of this triggered signal determines the sensitivity and dynamic range of the detector. Refer to Figure 1 the schematic diagram of the structure of the traditional radiation detector readout circuit shown.

[0051] Figure 1 In [reference], the input signal IN (i.e., the current signal corresponding to the pixel) is detected by the charge sensitive amplifier CSA in the first stage to obtain a radiation signal. Then, the radiation signal is input to the shaper. After the radiation signal is shaped, one path is input to the peak detection and hold circuit PDH for analog output ( Figure 1 Output in [reference] represents); the other path is input to the signal detection comparator Comparator to generate a trigger signal. This trigger signal is latched by a latch and then output ( Figure 1 Trigger in [reference] represents).

[0052] The inventors further studied and found that the trigger signal controls the output and reset of the entire circuit, playing a crucial role in the normal operation of the circuit. In a pixel-type detector, the area of each pixel is limited, and it is necessary to prioritize ensuring the circuit performance of the charge-sensitive amplifier (CSA) and the shaper stage. However, the area of the signal detection comparator (Comparator) is restricted, which determines that the noise and offset performance of the signal detection comparator (Comparator) will be relatively poor. Therefore, the trigger threshold VTH needs to be set relatively large to prevent false triggering. The problem this brings is that the circuit cannot respond to smaller input signals, which greatly reduces the measurement dynamic range.

[0053] To address the above problems, the inventors creatively proposed a multi-input pulse shaping circuit and an electronic device based on current addition according to the present invention. The technical solutions proposed by the present invention will be explained and described in detail below.

[0054] The multi-input pulse shaping circuit of the present invention, referring to Figure 2 the modular schematic diagram shown, includes: a multi-channel detection unit and a trigger signal unit. The input end of each detection unit ( Figure 2 represented by CSA1,..., CSAn in Figure 2 ) in the multi-channel detection unit is connected to a pixel to receive the current signal of a pixel ( Figure 2 represented by IN1,..., INn in

[0055] ). The output end of each detection unit is connected to the input end of a trigger signal unit ( CSA1 represented by TS in CSA2 CSA3 CSAn ). The multi-channel detection unit is used for each detection unit CSA1,..., CSAn to perform current detection on the pixel connected thereto, generating corresponding radiation signals V CSA1 、V CSA2 、V CSA3 、...、V CSAn , and adding up the radiation signals output by all detection units to obtain a total radiation signal and outputting it to a trigger signal unit TS; a trigger signal unit is used for processing the total radiation signal to obtain a trigger signal Trigger, and this trigger signal Trigger is used to trigger the output and reset of the multi-input pulse shaping circuit.

[0056] In an embodiment of the present invention, preferably, the output end of each detection unit in the multi-channel detection unit is connected to the input end of a trigger signal unit through a branch capacitor. Among them, the output end of each detection unit is connected to the first electrode plate of a branch capacitor, and the second electrode plates of the branch capacitors are connected to each other and then connected to the input end of a trigger signal unit. Each branch capacitor is used for filtering the radiation signal transmitted by the detection unit to which it is connected.

[0057] In an embodiment of the present invention, a preferred structure of a trigger signal unit includes: a trigger unit shaper and a trigger signal generation structure. The input end of the trigger unit shaper is connected to the second electrode plate of each branch capacitor to receive the total radiation signal; the output end of the trigger unit shaper is connected to the input end of the trigger signal generation structure, and the output end of the trigger signal generation structure outputs a trigger signal.

[0058] Among them, the branch capacitor is used to filter the radiation signal generated by each detection unit; the trigger unit shaper is used to shape the total radiation signal; the trigger signal generation structure is used to process the shaped total radiation signal to obtain a trigger signal.

[0059] In an embodiment of the present invention, a preferred structure of the trigger signal generation structure includes: a trigger unit comparator, a trigger unit capacitor, and a reset unit. The first electrode plate of the trigger unit capacitor is connected to the output end of the trigger unit shaper; the second electrode plate of the trigger unit capacitor is respectively connected to the inverting end of the trigger unit comparator and the reset unit; the non-inverting end of the trigger unit comparator receives a threshold voltage; the output end of the trigger unit comparator outputs a trigger signal.

[0060] Among them, the trigger unit capacitor is used to filter the total radiation signal; the trigger unit comparator is used to compare the filtered total radiation signal with the threshold voltage and generate and output a trigger signal according to the comparison result.

[0061] In addition, another preferred structure of the trigger signal generation structure includes: a trigger unit comparator, a trigger unit capacitor, a latch, and a reset unit. That is, compared with the previous trigger signal generation structure, it has an additional latch. The first electrode plate of the trigger unit capacitor is connected to the output end of the trigger unit shaper; the second electrode plate of the trigger unit capacitor is respectively connected to the inverting end of the trigger unit comparator and the reset unit; the non-inverting end of the trigger unit comparator receives a threshold voltage; the output end of the trigger unit comparator is connected to the input end of the latch; the output end of the latch outputs a trigger signal.

[0062] Among them, the trigger unit capacitor is used to filter the total radiation signal; the trigger unit comparator is used to compare the filtered total radiation signal with the threshold voltage and generate a trigger signal; the latch is used to latch and output the trigger signal.

[0063] In an embodiment of the present invention, a preferred structure of each detection unit includes: a charge sensitive amplifier and its feedback structure, and this feedback structure is connected across the input end and the output end of the charge sensitive amplifier; the input end of the charge sensitive amplifier is connected to a pixel, and the output end is connected to the input end of a trigger signal unit.

[0064] For a better understanding of the above-mentioned preferred structure, refer to Figure 3 the schematic diagram of the structure of a preferred multi-input pulse shaping circuit shown in Figure 3 which includes: n path detection units, each path detection unit is represented by a charge sensitive amplifier CSA1, …… CSAn, and the radiation signals generated by each path detection unit are represented by V CSA1 , V CSA2 , V CSA3 …… V CSAn The branch capacitors are represented by C1, C2, C3, …… Cn.

[0065] The second plates of the branch capacitors C1, C2, C3, …… Cn are short-circuited and then connected to the input end of the trigger unit comparator ShaperC. The feedback structure of the trigger unit comparator ShaperC is connected across its input end and output end, and is represented by a capacitor symbol and a transistor symbol. The output end of the trigger unit comparator ShaperC is connected to the first plate of the trigger unit capacitor C C , and the second plate of the trigger unit capacitor C C is connected to the inverting end of the trigger unit comparator Comparator and the reset unit ( Figure 3 represented by S1 in Figure 3 There is no exemplary showing of the trigger signal generation structure with a latch in Figure 4 which is shown exemplarily in the structure of

[0066] For the above-mentioned multi-input pulse shaping circuit creatively proposed based on current addition, the signal amplitude transmitted to the input end of the trigger unit comparator Comparator by the addition circuit will be much higher than that of the traditional circuit structure. Thus, the range of the threshold voltage VTH can be set relatively high. At this time, even if the noise and offset of the trigger unit comparator Comparator are relatively large, false triggering will not occur, and a comparator circuit that meets the requirements can be designed with a smaller area, achieving the goal of high sensitivity and avoiding an overly large area of the trigger unit comparator Comparator.

[0067] And since multiple pixels share one trigger signal generation unit, another benefit is that the number of control signals is reduced to 1 / n of the original. It can achieve adjacent multiple pixels sharing one control signal, triggering, reading, and resetting simultaneously. This reduces the area cost of the chip. At the same time, the tiny perturbations generated by a single pixel without an input signal will not be detected. For example, in the application scenario of radiation ray detection, if the detector detects radiation rays, there must be input signals in several surrounding pixel circuits, and the rays will not only excite a single pixel. In the traditional structure, if an individual single pixel is triggered, it may be due to some interference in the circuit system, while in the structure of the present invention, there will be no such problem because of the high trigger threshold, which undoubtedly increases the reliability of the chip operation.

[0068] Of course, it can be understood that the multi-input pulse shaping circuit proposed in the present invention also has an analog output part in the traditional shaping circuit structure. Therefore, the multi-input pulse shaping circuit further includes: a multi-channel radiation signal shaper and a multi-channel peak detection and holding unit; the output end of each detection unit is connected to the input end of a radiation signal shaper in the multi-channel radiation signal shaper through a signal capacitor; the output end of each radiation signal shaper in the multi-channel radiation signal shaper is connected to a peak detection and holding unit in the multiple peak detection and holding units.

[0069] Refer to Figure 4 A schematic diagram of a preferred overall architecture of a multi-input pulse shaping circuit shown. Figure 4 Neutralize Figure 3 The same parts as in Figure 4 The added parts in Figure 4 are: the radiation signal shapers Shaper1,... Shapern and the peak detection and holding units PDH1,... PDHn corresponding to each detection unit. Each of the peak detection and holding units PDH1,... PDHn outputs analog signals Output1,... Outputn respectively. Figure 4 A latch is exemplarily shown in

[0070] The radiation signal shapers Shaper1,... Shapern corresponding to each detection unit respectively shape the radiation signals generated by the detection units connected to them. After being processed by each of the peak detection and holding units PDH1,... PDHn respectively, the shaped radiation signals output corresponding analog signals Output1,... Outputn respectively. Figure 3 、 Figure 4Parts that are the same as the traditional circuit structure are not individually marked and described one by one, and can be understood in combination with the traditional circuit structure.

[0071] Based on the above multi-input pulse shaping circuit, an embodiment of the present invention further provides an electronic device, which includes: the multi-input pulse shaping circuit based on current addition as described above.

[0072] Through the above embodiments, the multi-input pulse shaping circuit provided by the present invention includes: a multi-channel detection unit and a trigger signal unit. The input end of each detection unit in the multi-channel detection unit is connected to a pixel, and the output end of each detection unit is connected to the input end of the trigger signal unit.

[0073] The multi-channel detection unit is used for each detection unit to perform current detection on the pixel connected thereto, generate a corresponding radiation signal, and add up the radiation signals output by all detection units to obtain a total radiation signal and output it to the trigger signal unit; the trigger signal unit is used to process the total radiation signal to obtain a trigger signal, and this trigger signal is used to trigger the output and reset of the multi-input pulse shaping circuit.

[0074] The multi-input pulse shaping circuit proposed by the present invention creatively proposes a multi-input pulse shaping circuit based on current addition. It is creatively proposed that the radiation signal detected by the current sense amplifier is divided into two paths. One path is the same as the traditional structure: after passing through a shaper and a peak detection and hold circuit (PDH), it is used as an analog output; the other path is taken out and shares a trigger signal unit with the radiation signals detected by other current sense amplifiers to generate a trigger signal. The entire circuit uses a multi-input pulse shaper based on current addition to achieve the effect of cluster triggering. The signal amplitude transmitted to the input end of the comparator by the adder circuit is much higher than that of the traditional circuit structure. Therefore, the threshold voltage range can be set relatively high. At this time, even if the noise and offset of the comparator are relatively large, it will not cause false triggering, and a comparator circuit that meets the requirements can be designed with a smaller area, achieving high sensitivity and avoiding the excessive area of the comparator.

[0075] The multi-input pulse shaping circuit structure proposed by the present invention can achieve a good measurement dynamic range while saving chip area, and there is no risk of false triggering at the same time. Since multiple pixels share a trigger signal generation unit, another benefit is that the number of control signals is reduced to 1 / n of the original, reducing the area cost of the chip. At the same time, the small perturbations generated by a single pixel without an input signal will not be detected, increasing the reliability of the chip operation. The multi-input pulse shaping circuit structure based on current addition can make the front-end circuit reach an excellent dynamic range while saving the area of the comparator. Therefore, the multi-input pulse shaping circuit proposed by the present invention has high practicability.

[0076] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0077] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the purpose of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. A multi-input pulse shaping circuit based on current addition, characterized in that: The multi-input pulse shaping circuit comprises: a multi-channel detection unit and a channel trigger signal unit; The input end of each detection unit in the plurality of detection units is connected to a pixel, and the output end of each detection unit is connected to the input end of the trigger signal unit; The multiple detection units are used for each detection unit to detect the current of the pixels connected thereto, generate corresponding radiation signals, and add the radiation signals output by all the detection units to obtain a total radiation signal and output it to the trigger signal unit; The trigger signal unit is used to process the total radiation signal to obtain a trigger signal, and the trigger signal is used to trigger the output and reset of the multi-input pulse shaping circuit.

2. The multi-input pulse shaping circuit according to claim 1, characterized in that: The output end of each detection unit in the multiple detection units is connected to the input end of the trigger signal unit through a branch capacitor; The output end of each detection unit is connected to the first plate of a branch capacitor, and the second plate of the branch capacitor is connected to the second plates of other branch capacitors and then connected to the input end of the trigger signal unit.

3. The multi-input pulse shaping circuit according to claim 2, characterized in that: The trigger signal unit comprises: a trigger unit shaper and a trigger signal generating structure; The input end of the trigger unit shaper is connected to the second electrode plate of each branch capacitor to receive the total radiation signal; The output end of the trigger unit shaper is connected to the input end of the trigger signal generating structure, and the output end of the trigger signal generating structure outputs the trigger signal.

4. The multi-input pulse shaping circuit according to claim 3, characterized in that: The branch capacitor is used to filter the radiation signal generated by each detection unit; The trigger unit shaper is used to shape the total radiation signal; The trigger signal generating structure is used to process the shaped total radiation signal to obtain the trigger signal.

5. The multi-input pulse shaping circuit according to claim 3, characterized in that: The trigger signal generating structure comprises: a trigger unit comparator, a trigger unit capacitor and a reset unit; The first electrode plate of the trigger unit capacitor is connected to the output end of the trigger unit shaper; The second electrode plate of the trigger unit capacitor is connected to the inverting end of the trigger unit comparator and the reset unit respectively; The positive phase terminal of the trigger unit comparator receives a threshold voltage; The output end of the trigger unit comparator outputs the trigger signal; Wherein, the trigger unit capacitor is used to filter the total radiation signal; The trigger unit comparator is used to compare the filtered total radiation signal with the threshold voltage, and generate and output the trigger signal according to the comparison result.

6. The multi-input pulse shaping circuit according to claim 5, characterized in that: The trigger signal generating structure includes: a trigger unit comparator, a trigger unit capacitor, a latch and a reset unit; The first electrode plate of the trigger unit capacitor is connected to the output end of the trigger unit shaper; The second electrode plate of the trigger unit capacitor is connected to the inverting end of the trigger unit comparator and the reset unit respectively; The positive phase terminal of the trigger unit comparator receives a threshold voltage; The output end of the trigger unit comparator is connected to the input end of the latch; The output end of the latch outputs the trigger signal; Wherein, the trigger unit capacitor is used to filter the total radiation signal; The trigger unit comparator is used to compare the filtered total radiation signal with the threshold voltage and generate the trigger signal according to the comparison result; The latch is used to latch and output the trigger signal.

7. The multi-input pulse shaping circuit according to claim 1, characterized in that: Each detection unit includes: a charge sensitive amplifier and a feedback structure thereof, wherein the feedback structure is connected between an input terminal and an output terminal of the charge sensitive amplifier; The input end of the charge sensitive amplifier is connected to a pixel, and the output end is connected to the input end of the trigger signal unit.

8. The multi-input pulse shaping circuit according to claim 1, characterized in that: The multi-input pulse shaping circuit also includes: a multi-path radiation signal shaper and a multi-path peak detection and holding unit; The output end of each detection unit is connected to the input end of one of the radiation signal shapers through a signal capacitor; The output end of each radiation signal shaper in the plurality of radiation signal shapers is connected to one peak value detection and holding unit in the plurality of peak value detection and holding units.

9. The multi-input pulse shaping circuit according to claim 1, characterized in that: When drawing the layout, a plurality of adjacent pixels are taken as a cluster, and all detection units corresponding to all pixels in the cluster share one trigger signal unit.

10. An electronic device, characterized in that: The electronic device comprises: a multi-input pulse shaping circuit as described in any one of claims 1-9.

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