CN210380775U - Charge sensitive preamplifier - Google Patents
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- CN210380775U CN210380775U CN201921488084.2U CN201921488084U CN210380775U CN 210380775 U CN210380775 U CN 210380775U CN 201921488084 U CN201921488084 U CN 201921488084U CN 210380775 U CN210380775 U CN 210380775U
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Abstract
The utility model discloses a sensitive preamplifier of electric charge, this amplifier includes: the noise reduction circuit comprises a feedback circuit, a noise reduction circuit, an amplifying circuit and a following circuit; the first end of the feedback circuit receives the detection signal, one end of the noise reduction circuit is connected with the second end of the feedback circuit, the other end of the noise reduction circuit is connected with one end of the amplification circuit, the other end of the amplification circuit is connected with the first end of the following circuit, the second end of the following circuit is connected with the third end of the feedback circuit, and the third end of the following circuit outputs the detection signal after amplification. The noise reduction circuit can reduce the noise slope of the detection signal, the amplification circuit can amplify the noise-reduced detection signal, the following circuit can output the amplified detection signal and reduce the impedance of the output signal, and the feedback capacitor can improve the closed-loop gain of the charge sensitive preamplifier. Therefore, through implementing the utility model discloses, can satisfy the ionization chamber to the sensitive preceding performance index who puts of electric charge, realize the enlarged function to ionization chamber output signal.
Description
Technical Field
The utility model relates to a nuclear radiation measures technical field, concretely relates to sensitive preamplifier of electric charge.
Background
In nuclear radiation measurement, signals output by a detector are often small, an amplifier is needed to perform signal amplification and then measurement, and in order to improve the signal-to-noise ratio of a system and reduce the influence of external interference when the signals are transmitted through a cable, a preamplifier (hereinafter referred to as a "preamplifier") is generally adopted to amplify the signals output by the detector. At present, three types of preamplifier are mainly applied in the field of nuclear radiation measurement, namely charge sensitive preamplifier, voltage sensitive preamplifier and current sensitive preamplifier.
Among them, charge sensitive preamplifier is generally applied to high resolution spectral measurement. The output amplitude of the charge sensitive preamplifier reflects the magnitude of the input charge and is independent of the input capacitance, so the charge sensitive preamplifier is called. The charge sensitive preamplifier has good low noise performance and its output signal amplitude is substantially unaffected by the inter-detector electrode capacitance. In high-resolution energy spectrum measurement, when the adopted measuring equipment is an ionization chamber, the existing preamplifier cannot meet the performance index of the ionization chamber equipment because the ionization chamber has higher requirements on the charge sensitivity and the noise of the charge sensitive preamplifier.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a charge-sensitive preamplifier, so as to solve the technical problem that the existing preamplifier cannot meet the performance index of the ionization chamber device because the ionization chamber has high requirements on the charge sensitivity and the noise slope of the charge-sensitive preamplifier.
The embodiment of the utility model provides a technical scheme as follows:
an embodiment of the utility model provides a sensitive preamplifier of electric charge, this amplifier includes: the noise reduction circuit comprises a feedback circuit, a noise reduction circuit, an amplifying circuit and a following circuit; the first end of the feedback circuit receives a detection signal, one end of the noise reduction circuit is connected with the second end of the feedback circuit, the other end of the noise reduction circuit is connected with one end of the amplifying circuit, the other end of the amplifying circuit is connected with the first end of the following circuit, the second end of the following circuit is connected with the third end of the feedback circuit, and the third end of the following circuit outputs the amplified detection signal.
Optionally, the charge sensitive preamplifier further comprises: and one end of the load circuit is connected with the other end of the amplifying circuit, and the other end of the load circuit is grounded.
Optionally, the feedback circuit comprises: the first capacitor, the seventh capacitor and the seventh resistor; one end of the first capacitor receives the detection signal and is connected with one end of the seventh capacitor, the other end of the first capacitor is connected with one end of the noise reduction circuit and one end of the seventh resistor, and the other end of the seventh resistor and the other end of the seventh capacitor are connected with the second end of the following circuit.
Optionally, the noise reduction circuit comprises: the first triode, the second resistor, the second capacitor, the third capacitor and the first constant current source; the first end of the first triode is connected with the second end of the feedback circuit, the third end of the first triode is grounded, the second end of the first triode is connected with one end of the second resistor and one end of the amplifying circuit, the other end of the second resistor is connected with one end of the second capacitor, one end of the third capacitor and one end of the first constant current source, the other end of the second capacitor is grounded, and the other end of the first constant current source is externally connected with a power supply.
Optionally, the amplifying circuit comprises: the second triode, the third resistor, the fourth resistor and the fourth capacitor; the second end of the second triode is connected with one end of the noise reduction circuit, the third end of the second triode is connected with the first end of the following circuit, the first end of the second triode is connected with one end of the fourth capacitor, one end of the third resistor and one end of the fourth resistor, the other end of the fourth capacitor and the other end of the fourth resistor are grounded, and the other end of the third resistor is externally connected with a power supply.
Optionally, the follower circuit comprises: the first amplifier, the fifth capacitor, the sixth capacitor, the fifth resistor, the sixth resistor and the eighth resistor; the second end of the first amplifier is connected with the other end of the amplifying circuit, the first end of the first amplifier is connected with the third end of the feedback circuit, one end of the sixth resistor and one end of the eighth resistor, the other end of the eighth resistor outputs an amplified detection signal, the third end of the first amplifier is connected with one end of the fifth resistor and the other end of the sixth resistor, the other end of the fifth resistor is grounded, the fourth end of the first amplifier is connected with one end of the sixth capacitor and an external power supply, the other end of the sixth capacitor is grounded, the fifth end of the first amplifier is connected with one end of the fifth capacitor and the external power supply, and the other end of the fifth capacitor is grounded.
Optionally, the load circuit includes a second constant current source, one end of the second constant current source is connected to the other end of the amplifying circuit, and the other end of the second constant current source is grounded.
Optionally, a withstand voltage value of the seventh capacitor is 150V to 250V.
Optionally, the seventh resistance is a high voltage resistor.
Optionally, the resistance of the seventh resistor is 400M Ω to 600M Ω.
The embodiment of the utility model provides a technical scheme has following advantage:
the embodiment of the utility model provides a sensitive preamplifier of electric charge through setting up the circuit of making an uproar that falls, can reduce amplifier circuit's noise slope, satisfies the ionization chamber to the requirement of amplifier circuit noise. In the feedback circuit, the seventh capacitor in the feedback circuit is arranged in front of the first capacitor, so that the feedback capacitor of the charge sensitive preamplifier can be greatly reduced, the charge sensitivity of the charge sensitive preamplifier is improved, and the follower circuit can provide better impedance transformation for the amplifier. Therefore, by implementing the method, the performance index of the ionization chamber for sensitive forward amplification of the charges can be met, and the amplification function of the detection signal output by the ionization chamber is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art charge sensitive preamplifier configuration;
fig. 2 is a schematic diagram of a charge-sensitive preamplifier according to an embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The schematic diagram of a current charge-sensitive preamplifier is shown in fig. 1, where a is the open-loop gain of the amplifier, C is the coupling capacitor, and R isdIs a detector bias resistor, CfIs a feedback capacitor, R is connected in parallel withfIs a feedback resistor. To ensure C during the operation of the amplifierfFor the accumulation of upper charges, in general, Rf is selected to be of the order of M Ω to G Ω. RfHas two main functions, namely, the first function is used for discharging CfThe second is to generate DC negative feedback to stabilize the DC working point of the amplifier. The C between the detector and the amplifier plays a role in blocking, and the capacitance with the value of thousands of pF magnitude can be selected.
Specifically, when the detector outputs a detection signal to the charge-sensitive preamplifier, the charge-sensitive preamplifier output voltage amplitude may be represented as Vom＝Q/CfWhere Q is the amount of charge generated by the detector, Q ═ Ee/W, E is the incident energy, E is the electron charge, 1.6E coulombs, and W is the average ionization energy, W ═ 3.62 × 10MeV for silicon semiconductor detectors and 2.96 × 10MeV for germanium semiconductor detectors. When the charge pre-amplifier is in operation, the total input capacitance can be represented as Cif＝Ci+(1+A0)CfIn which C isi＝CD+CS+CA，CDIs the detector body capacitance, CSDistributing capacitance for the leads, CAIs an amplifierInput capacitance due to (1+ A0) CfIs much greater than CiSo that the gain of the charge sensitive preamplifier is only equal to the feedback capacitor CfIn relation to the charge sensitivity of the charge sensitive preamplifier, the charge sensitivity can be expressed as AQ＝1/Cf。
From the above analysis, it can be seen that the output voltage amplitude of the charge sensitive preamplifier is proportional to the charge Q and inversely proportional to the capacitance CfThe charge sensitivity is inversely proportional to the capacitance Cf. Therefore, in order to make the existing charge sensitive front-end reach the use requirement of the ionization chamber, the capacitance value C of the feedback capacitor needs to be reducedfHowever, since the open-loop gain of the charge sensitive preamplifier cannot reach infinity, the capacitance of the feedback capacitor cannot be decreased indefinitely. Therefore, the existing charge sensitive preamplifier can not meet the requirement of the performance index of the ionization chamber.
Based on this, the present invention provides a charge-sensitive preamplifier, as shown in fig. 2, including: a feedback circuit 10, a noise reduction circuit 20, an amplification circuit 30, and a follower circuit 40; the first end of feedback circuit 10 receives the detection signal, and the second end of feedback circuit 10 is connected to the one end of noise reduction circuit 20, and the one end of amplifier circuit 30 is connected to the other end of noise reduction circuit 20, and the first end of follower circuit 40 is connected to the other end of amplifier circuit 30, and the third end of follower circuit 40 is connected to the second end of follower circuit 40, and the third end of follower circuit 40 outputs the detection signal after the amplification.
The embodiment of the utility model provides a sensitive preamplifier of electric charge can be used for receiving the detected signal of ionization chamber output and enlarge, specifically, falls the noise slope that the circuit of making an uproar can reduce detected signal, and amplifier circuit can enlarge the detected signal after making an uproar, and follower circuit can be with the detected signal output after enlargeing and reduce output signal's impedance, and feedback electric capacity can improve the closed loop gain of this sensitive preamplifier of electric charge.
Specifically, in one embodiment, as shown in fig. 2, the charge-sensitive preamplifier further includes: and a load circuit 50, wherein one end of the load circuit 50 is connected to the other end of the amplifying circuit 30, and the other end of the load circuit 50 is grounded.
Specifically, in an embodiment, as shown in fig. 2, the feedback circuit 10 includes: a first capacitor C1, a seventh capacitor C7 and a seventh resistor R7; one end of the first capacitor C1 receives the detection signal and is connected to one end of the seventh capacitor C7, the other end of the first capacitor C1 is connected to one end of the noise reduction circuit 20 and one end of the seventh resistor R7, and the other end of the seventh resistor R7 and the other end of the seventh capacitor C7 are connected to the second end of the follower circuit 40.
The embodiment of the utility model provides a sensitive preamplifier of electric charge is connected feedback circuit 10 with the input and the output of the sensitive preamplifier of electric charge respectively, can improve the closed loop gain of the sensitive preamplifier of electric charge, sets up seventh electric capacity C7 in feedback circuit 10 before first electric capacity C1, can reduce the sensitive preamplifier's of electric charge feedback electric capacity greatly to improve the sensitive preamplifier's of electric charge sensitivity. In addition, the first capacitor C1 in the feedback circuit 10 may function as a dc blocking, and the seventh resistor R7 provided in the feedback circuit 10 may provide a voltage bleeding path for the seventh capacitor C7 during the operation of the charge sensitive preamplifier.
Specifically, in an embodiment, the seventh capacitor C7 may be a high-voltage capacitor, so that the seventh capacitor C7 can withstand a higher voltage. In practical applications, the seventh capacitor C7 may be a capacitor with a withstand voltage of 1500V to 2500V. In the embodiment of the present invention, the seventh capacitor C7 has a high voltage resistance of 1pF/2kV as its selection parameter.
In an embodiment, the seventh resistor R7 may be a high voltage resistor, which is usually made of a ceramic substrate, has stable properties, is not prone to aging of devices during long-term use, has good noise characteristics, and can be used as a feedback resistor. In addition, for the selection of the resistance of the seventh resistor R7, the larger the resistance is theoretically, the better the noise characteristics are, but the too large resistance may cause the signal to return to the baseline state with a very slow time constant, so the seventh resistor R7 may select a resistor with a resistance of 400M Ω to 600M Ω, in the embodiment of the present invention, the seventh resistor R7 selects a resistor with a resistance of 500M Ω.
Specifically, in one embodiment, as shown in fig. 2, the noise reduction circuit 20 includes: the circuit comprises a first triode Q1, a second resistor R2, a second capacitor C2, a third capacitor C3 and a first constant current source L1; the first end of the first triode Q1 is connected with the second end of the feedback circuit 10, the third end of the first triode Q1 is grounded, the second end of the first triode Q1 is connected with one end of the second resistor R2 and one end of the amplifying circuit 30, the other end of the second resistor R2 is connected with one end of the second capacitor C2, one end of the third capacitor C3 and one end of the first constant current source L1, the other end of the second capacitor C2 and the other end of the third capacitor C3 are grounded, and the other end of the first constant current source L1 is externally connected with a power supply.
The embodiment of the utility model provides a sensitive preamplifier of electric charge sets up in this amplifier and falls circuit 20 of making an uproar and can fall the processing of making an uproar to the detected signal to reduce the noise slope of this amplifier, fall the first triode Q1 among the circuit 20 of making an uproar and can be field effect transistor, this first triode Q1's quantity can be a plurality of, when setting up a plurality of first triode Q1 pipe parallelly connected, reduction noise slope that can be very big. The first constant current source L1 may be a triode, and the first constant current source L1 may provide the first transistor Q1 with a quiescent current required for its operation. In addition, the seventh resistor R7 provided in the feedback circuit 10 may also provide a suitable quiescent operating point for the gate of the first transistor Q1.
Specifically, in one embodiment, as shown in fig. 2, the amplifying circuit 30 includes: a second transistor Q2, a third resistor R3, a fourth resistor R4, and a fourth capacitor C4; the second end of the second triode Q2 is connected with one end of the noise reduction circuit 20, the third end of the second triode Q2 is connected with the first end of the follower circuit 40, the first end of the second triode Q2 is connected with one end of a fourth capacitor C4, one end of a third resistor R3 and one end of a fourth resistor R4, the other end of the fourth capacitor C4 and the other end of the fourth resistor R4 are grounded, and the other end of the third resistor R3 is externally connected with a power supply.
The embodiment of the utility model provides a sensitive preamplifier of electric charge, wherein, amplifier circuit 30 belongs to and shares basic amplifier circuit, and this circuit has good frequency response characteristic, can realize the amplification to detecting signal.
Specifically, in one embodiment, as shown in fig. 2, the follower circuit 40 includes: a first amplifier P1, a fifth capacitor C5, a sixth capacitor C6, a fifth resistor R5, a sixth resistor R6 and an eighth resistor R8; the second end of the first amplifier P1 is connected to the other end of the amplifying circuit 30, the first end of the first amplifier P1 is connected to the third end of the feedback circuit 10, one end of the sixth resistor R6 and one end of the eighth resistor R8, the other end of the eighth resistor R8 outputs the amplified detection signal, the third end of the first amplifier P1 is connected to one end of the fifth resistor R5 and the other end of the sixth resistor R6, the other end of the fifth resistor R5 is grounded, the fourth end of the first amplifier P1 is connected to one end of the sixth capacitor C6 and the external power supply, the other end of the sixth capacitor C6 is grounded, the fifth end of the first amplifier P1 is connected to one end of the fifth capacitor C5 and the external power supply, and the other end of the fifth capacitor C5 is grounded.
The embodiment of the utility model provides a sensitive preamplifier of electric charge, follower circuit 40 can regard as buffer level and isolation level, because the output impedance of amplifier is generally than higher, usually at several kilohms to tens of kilohms, if the input impedance of back level is less, then the signal just has considerable partial loss in the output resistance of preceding stage. At this time, a follower is required for buffering. Play the role of starting and stopping. Therefore, the following circuit 40 in the embodiment of the present invention can provide better buffering and impedance transformation effects.
Specifically, in an embodiment, as shown in fig. 2, the load circuit 50 includes a second constant current source L2, one end of the second constant current source L2 is connected to the other end of the amplifying circuit 30, and the other end of the second constant current source L2 is grounded. The second constant current source L2 may be formed by a transistor, and when the amplifier operates, the second constant current source L2 may be equivalent to a large load, which provides a sufficiently large open-loop gain for the amplifier.
Specifically, in one embodiment, the second capacitor C2 and the fourth capacitor C4 may be electrolytic capacitors, and the capacitors may function as a filter and a dc block in the amplifier. The second capacitor C2 and the fourth capacitor C4 may also be capacitors of other types, which is not limited by the present invention.
The embodiment of the utility model provides a sensitive preamplifier of electric charge through setting up the circuit of making an uproar that falls, can reduce amplifier circuit's noise slope, satisfies the ionization chamber to the requirement of amplifier circuit noise. In the feedback circuit, the seventh capacitor in the feedback circuit is arranged in front of the first capacitor, so that the feedback capacitor of the charge sensitive preamplifier can be greatly reduced, the charge sensitivity of the charge sensitive preamplifier is improved, and the follower circuit can provide better impedance transformation for the amplifier. Therefore, by implementing the method, the performance index of the ionization chamber for sensitive forward amplification of the charges can be met, and the amplification function of the output signal of the ionization chamber is realized.
As shown in fig. 2, when the charge-sensitive preamplifier receives the detection signal output by the ionization chamber, one end of the ionization chamber D1 may be connected to the input terminal of the amplifier and one end of the first resistor R1, the other end of the ionization chamber D1 is grounded, and the other end of the first resistor R1 may be externally connected to the high voltage signal HV. The first resistor R1 may be used as a bias resistor to provide a current of an appropriate magnitude to the amplifier to achieve an appropriate operating point for the amplifier.
The embodiment of the utility model provides a sensitive preamplifier of electric charge is as a weak current measuring device, in this amplifier preparation process, can adopt special fluorine dragon insulator material in the partial position of this sensitive preamplifier of electric charge, and this material can avoid the performance influence that electric leakage etc. caused this amplifier.
Specifically, to the utility model provides a when the sensitive preamplifier of electric charge tests, the resistance of selecting the seventh resistance is 500M omega, and the parameter of seventh electric capacity is 1pF/2kV, and the parameter of first electric capacity is 10nF/2kV, can obtain after the test that its partial parameter reaches corresponding index as shown in Table 1.
TABLE 1
| Principal parameters | Main technical indexes |
| Rise time | 20nS(0pF) |
| Zero capacitive noise | 650eV |
| Sensitivity to charge | 44mV/MeV |
| Maximum count pass rate | 250Kcps |
| Decay time of output signal | 50uS |
| Output impedance | 50Ω |
| Power consumption | Less than 1W |
When the amplifier with the parameters is applied to the energy spectrum measurement of Am-241, the resolution of Am-241 can reach 109.06keV @5486keV, namely the resolution standard of Am-241 is reached, so that the charge sensitive preamplifier adopting the parameters meets the performance index of ionization chamber measuring equipment.
Although the present invention has been described in detail with respect to the exemplary embodiments and the advantages thereof, those skilled in the art will appreciate that various changes, substitutions and alterations can be made to the embodiments without departing from the spirit of the invention and the scope of the invention as defined by the appended claims. For other examples, one of ordinary skill in the art will readily appreciate that the order of the process steps may be varied while maintaining the scope of the present invention.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. As one of ordinary skill in the art will readily appreciate from the disclosure of the present invention, processes, machines, manufacture, compositions of matter, means, methods, or steps, presently existing or later to be developed, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized according to the present invention. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (10)
1. A charge sensitive preamplifier, comprising: the noise reduction circuit comprises a feedback circuit, a noise reduction circuit, an amplifying circuit and a following circuit;
the first end of the feedback circuit receives a detection signal, one end of the noise reduction circuit is connected with the second end of the feedback circuit, the other end of the noise reduction circuit is connected with one end of the amplifying circuit, the other end of the amplifying circuit is connected with the first end of the following circuit, the second end of the following circuit is connected with the third end of the feedback circuit, and the third end of the following circuit outputs the amplified detection signal.
2. The charge sensitive preamplifier according to claim 1, further comprising: and one end of the load circuit is connected with the other end of the amplifying circuit, and the other end of the load circuit is grounded.
3. The charge sensitive preamplifier of claim 1, wherein the feedback circuit comprises: the first capacitor, the seventh capacitor and the seventh resistor;
one end of the first capacitor receives the detection signal and is connected with one end of the seventh capacitor, the other end of the first capacitor is connected with one end of the noise reduction circuit and one end of the seventh resistor, and the other end of the seventh resistor and the other end of the seventh capacitor are connected with the second end of the following circuit.
4. The charge sensitive preamplifier of claim 1, wherein the noise reduction circuit comprises: the first triode, the second resistor, the second capacitor, the third capacitor and the first constant current source;
the first end of the first triode is connected with the second end of the feedback circuit, the third end of the first triode is grounded, the second end of the first triode is connected with one end of the second resistor and one end of the amplifying circuit, the other end of the second resistor is connected with one end of the second capacitor, one end of the third capacitor and one end of the first constant current source, the other end of the second capacitor is grounded, and the other end of the first constant current source is externally connected with a power supply.
5. The charge sensitive preamplifier according to claim 1, wherein the amplifying circuit comprises: the second triode, the third resistor, the fourth resistor and the fourth capacitor;
the second end of the second triode is connected with one end of the noise reduction circuit, the third end of the second triode is connected with the first end of the following circuit, the first end of the second triode is connected with one end of the fourth capacitor, one end of the third resistor and one end of the fourth resistor, the other end of the fourth capacitor and the other end of the fourth resistor are grounded, and the other end of the third resistor is externally connected with a power supply.
6. The charge sensitive preamplifier of claim 1, wherein the follower circuit comprises: the first amplifier, the fifth capacitor, the sixth capacitor, the fifth resistor, the sixth resistor and the eighth resistor;
the second end of the first amplifier is connected with the other end of the amplifying circuit, the first end of the first amplifier is connected with the third end of the feedback circuit, one end of the sixth resistor and one end of the eighth resistor, the other end of the eighth resistor outputs an amplified detection signal, the third end of the first amplifier is connected with one end of the fifth resistor and the other end of the sixth resistor, the other end of the fifth resistor is grounded, the fourth end of the first amplifier is connected with one end of the sixth capacitor and an external power supply, the other end of the sixth capacitor is grounded, the fifth end of the first amplifier is connected with one end of the fifth capacitor and the external power supply, and the other end of the fifth capacitor is grounded.
7. The charge sensitive preamplifier according to claim 2, wherein the load circuit comprises a second constant current source, one end of the second constant current source is connected to the other end of the amplifying circuit, and the other end of the second constant current source is grounded.
8. The charge-sensitive preamplifier according to claim 3, wherein the withstand voltage value of the seventh capacitor is 150V to 250V.
9. The charge sensitive preamplifier according to claim 3, wherein the seventh resistor is a high voltage resistor.
10. The charge-sensitive preamplifier according to claim 9, wherein the seventh resistor has a resistance of 400M Ω to 600M Ω.
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| CN201921488084.2U CN210380775U (en) | 2019-09-06 | 2019-09-06 | Charge sensitive preamplifier |
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| CN201921488084.2U CN210380775U (en) | 2019-09-06 | 2019-09-06 | Charge sensitive preamplifier |
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