32-path integrated multi-type preamplifier PCB (printed circuit board)

Abstract

The invention belongs to the technical field of integrated PCBs, and particularly relates to a 32-path integrated multi-type pre-amplifier PCB, which comprises 10 circuit layers, namely a component layer, a ground plane I, a wiring layer I, a power plane I, a wiring layer II, a ground plane II, a wiring layer III, a power plane II, a wiring layer IV and a bottom layer in sequence, the 32-path pre-amplifier has the advantages that the 32-path pre-amplifier is designed, each path of amplifier can be set to be charge-sensitive or current-sensitive by adjusting element parameters of a circuit board, and the polarity and gain of each path of output signal can be set.

Description

Technical Field

[0001] The present application belongs to the field of integrated PCB technology, and specifically relates to a 32-channel integrated preamplifier PCB board. Background Art

[0002] In particle collision or target shooting experiments, or in the detection of cosmic rays, environmental radiation, etc., various detectors are needed, such as semiconductor detectors, scintillator detectors, gas detectors, etc. With the improvement of measurement accuracy, these detectors require more and more readout electronic circuits, among which the preamplifier plays a key role in improving the measurement accuracy and count rate of the detector.

[0003] The preamplifier is often placed close to the detector readout electrode to improve its signal-to-noise ratio; depending on different measurement requirements, the detector output current or charge signal needs to be measured; according to the polarity and size of the input signal and the requirements of the back-end electronics, the amplifier gain and output signal polarity need to be set.

[0004] Existing technologies can often only achieve one or several of the characteristics of circuit integration, versatility, flexibility, and low crosstalk. High integration is often accompanied by observable crosstalk, and circuits are often only suitable for specific application scenarios of specific detectors. There are few inventions that achieve all of these characteristics. Summary of the invention

[0005] Based on the above problems, the present application provides a 32-channel integrated preamplifier PCB board, and its technical solution is:

[0006] A 32-channel integrated multi-type preamplifier PCB board comprises 10 circuit layers, which are component layer, ground plane 1, wiring layer 1, power plane 1, wiring layer 2, ground plane 2, wiring layer 3, power plane 2, wiring layer 4 and bottom layer in sequence; four types of preamplifiers are arranged on the component layer, all preamplifier inputs and outputs are respectively concentrated on a row connector, the row connector has 4 rows and 8 columns, the 1st and 3rd columns are on wiring layer 1, the 2nd and 4th columns are on wiring layer 2, the 5th and 7th columns are on wiring layer 3, and the 6th and 8th columns are on wiring layer 4; all internal wiring layers except signal lines and both sides thereof are all copper-clad, and the copper-clad grounding is performed; ground plane 1 provides positive and negative power supply tracks for two different types and non-adjacent preamplifiers; ground plane 2 provides positive and negative power supply tracks for other two different types and non-adjacent preamplifiers; power plane 1, power plane 2, ground plane 1 and ground plane 2 provide reference layers for upper and lower adjacent signal wirings; the bottom layer is a copper-clad ground plane.

[0007] Preferably, adjacent signal pins of the row connector are separated by two pins, which are ground and power pins respectively; the inner signal wiring of the circuit layer is all strip lines, the inner signal lines are all arranged in parallel, and the impedance is designed to be 50Ω.

[0008] Preferably, the direction parallel to the circuit board is set as the horizontal direction. If adjacent signal lines in the horizontal direction are in the same layer, the minimum horizontal spacing is more than 4 times the line width; if adjacent signal lines in the horizontal direction are separated by one layer, the minimum horizontal spacing is more than 2 times the line width; if adjacent signal lines in the horizontal direction are separated by two layers, the minimum horizontal spacing is 0 or greater.

[0009] Preferably, a grounding guard ring is arranged around each amplifier, and necessary grounding stitching holes are arranged on the guard ring, on the edge of the circuit board, and on both sides of each inner signal line.

[0010] Preferably, each amplifier includes two operational amplifiers, C c is the AC coupling capacitor between the detector and c is the terminating resistor for achieving terminal impedance matching, R o It is the termination resistor to achieve source end matching.

[0011] Preferably, one type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit; the first-stage operational amplifier circuit is a transimpedance circuit, which realizes the conversion of the detector output current to voltage, and the gain is For the compensation capacitor, and It is also set to achieve circuit stability. If the circuit has no stability problem, or can be adjusted only To make it stable, you can not install and The second stage operational amplifier circuit is a common-phase amplifier. and are the feedback resistor and the feedback capacitor respectively, and the gain is adjust Minimize the amplifier output DC bias, Can reduce Contribution to output noise. If there is no output DC bias problem, it can be omitted. and

[0012] Preferably, one type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit, the first-stage operational amplifier circuit is a transimpedance circuit, and the second-stage operational amplifier circuit is an inverting amplifier. and are the feedback resistor and the feedback capacitor respectively, and the gain is adjust Minimize the amplifier output DC bias, Can reduce Contribution to output noise; if there is no output DC bias problem, it can be omitted and

[0013] Preferably, one type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit, wherein the first-stage operational amplifier circuit is an integration circuit that integrates the detector output current and outputs an amplitude Proportional to the total output charge Q of the detector; is the feedback resistor, and the time constant of the exponential decay part of the output signal of the integration circuit is and It is set to achieve circuit stability. If the circuit has no stability problem, it can be omitted. and The second stage operational amplifier circuit is in-phase amplification, and there is a parallel connection between the two stages of operational amplifier circuits. and C pz , they are the same as the in-phase amplifier circuit Together they form a pole-zero cancellation network to adjust the attenuation speed of the output signal of the integration circuit; whether a pole-zero cancellation network is needed can be determined according to the specific application scenario. If not, a 0Ω resistor can be used instead of the parallel and C pz .

[0014] Preferably, one type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit, the first-stage operational amplifier circuit is an integrating circuit, the second-stage operational amplifier circuit is an inverting amplifier, and the two-stage operational amplifier circuits are connected in parallel. and C pz , they are related to the inverting amplifier circuit Together they form a pole-zero cancellation network. Whether a pole-zero cancellation network is needed can be determined based on the specific application scenario. If not, a 0Ω resistor can be used to replace the parallel and C pz .

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] High integration, one circuit board integrates 32 amplifiers. High versatility and flexibility, each amplifier can be charge sensitive or current sensitive, can adapt to different detector output signal polarities, and the conversion gain can be easily adjusted according to the detector and subsequent data acquisition components. Low crosstalk, the circuit board structure of the present invention can eliminate observable crosstalk between any two channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a row type connector;

[0018] Figure 2It is a preamplifier (type one);

[0019] Figure 3 It is a preamplifier (type 2);

[0020] Figure 4 It is a preamplifier (type three);

[0021] Figure 5 It is a preamplifier (type 4).

[0022] Figure 6 This is a schematic diagram of the integrated PCB pins. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention and the drawings of the specification to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] A 32-channel integrated multi-type preamplifier PCB board comprises 10 circuit layers, which are component layer, ground plane 1, wiring layer 1, power plane 1, wiring layer 2, ground plane 2, wiring layer 3, power plane 2, wiring layer 4 and bottom layer in sequence; four types of preamplifiers are arranged on the component layer, all preamplifier inputs and outputs are respectively concentrated on a row connector, the row connector has 4 rows and 8 columns, the 1st and 3rd columns are on wiring layer 1, the 2nd and 4th columns are on wiring layer 2, the 5th and 7th columns are on wiring layer 3, and the 6th and 8th columns are on wiring layer 4; all internal wiring layers except signal lines and both sides thereof are all copper-clad, and the copper-clad grounding is performed; ground plane 1 provides positive and negative power supply tracks for two different types and non-adjacent preamplifiers; ground plane 2 provides positive and negative power supply tracks for other two different types and non-adjacent preamplifiers; power plane 1, power plane 2, ground plane 1 and ground plane 2 provide reference layers for upper and lower adjacent signal wirings; the bottom layer is a copper-clad ground plane.

[0025] Figure 1 In the diagram, the left row connector is the input terminal, connected to the detector. The right row connector is the output terminal, connected to the subsequent data acquisition system. The 32 connection points on the row connector are CH1-CH32.

[0026] Figure 6As shown in the figure, the pins indicated by the numbers are the amplifier numbers. For example, 01 indicates the 1st amplifier, 02 is on the same side and below 01, two pins away from 01, and it goes to 04 and then turns to the other side, that is, the position shown in 05 is the 5th amplifier, 06 is on the same side and below 05, two pins away from 05, and it goes to 08 and then turns to the other side, that is, the position shown in 09 is the 9th amplifier, and so on. The amplifier numbering on the circuit board adopts the row priority principle, such as the 1st channel is the 1st row and 1st column, the 5th channel is the 1st row and 5th column, the 21st channel is the 3rd row and 5th column, and so on.

[0027] All inner signal wiring is stripline to reduce signal crosstalk. Each layer contains 8 inputs and 8 outputs, a total of 64 single-ended signal lines. All these inner signal lines are arranged in parallel, and the impedance is designed to be 50Ω. The direction parallel to the circuit board is now called the horizontal direction. If adjacent signal lines in the horizontal direction are on the same layer, the minimum horizontal spacing is more than 4 times the line width; if adjacent signal lines in the horizontal direction are separated by one layer, the minimum horizontal spacing is more than 2 times the line width; if adjacent signal lines in the horizontal direction are separated by two layers, the minimum horizontal spacing is 0 or greater.

[0028] All amplifier inputs and outputs are concentrated on a row connector. Adjacent signal pins are separated by two pins, which are ground and power pins, to reduce signal crosstalk and maintain the continuity of the signal return path.

[0029] A grounding guard ring is set around each amplifier, and necessary grounding stitching holes are set on the guard ring, the edge of the circuit board, and on both sides of each inner signal line.

[0030] Each amplifier can achieve Figure 2 One or any of the circuits shown, all four circuit diagrams contain two operational amplifiers. c is the AC coupling capacitor between the detector and c is the terminating resistor for achieving terminal impedance matching, R o It is the termination resistor to achieve source end matching.

[0031] Figure 3 The first-stage operational amplifier circuit is a transimpedance circuit, which realizes the conversion of the detector output current to voltage, and the gain is For compensation capacitor. and It is also set to achieve circuit stability. If the circuit has no stability problem, or can be adjusted only To make it stable, you can not install and The second stage operational amplifier circuit is a common-phase amplifier. and are the feedback resistor and the feedback capacitor respectively, and the gain is adjust Minimize the amplifier output DC bias, Can reduce If there is no output DC bias problem, you can not install and

[0032] Figure 4 , the first stage operational amplifier circuit is a transimpedance circuit, and Figure 3 The second stage operational amplifier circuit is an inverting amplifier. and are the feedback resistor and the feedback capacitor respectively, and the gain is adjust Minimize the amplifier output DC bias, Can reduce If there is no output DC bias problem, you can not install and

[0033] Figure 4 The first-stage operational amplifier circuit is an integrating circuit that integrates the detector output current and outputs the amplitude It is proportional to the total output charge Q of the detector. is the feedback resistor, and the time constant of the exponential decay part of the output signal of the integration circuit is and It is set to achieve circuit stability. If the circuit has no stability problem, it can be omitted. and The second stage operational amplifier circuit is a common-mode amplifier. Figure 2 The two-stage operational amplifier circuit is connected in parallel. and C pz , they are the same as the in-phase amplifier circuit Together they form a pole-zero cancellation network to adjust the attenuation speed of the output signal of the integrator circuit. Whether a pole-zero cancellation network is needed can be determined based on the specific application scenario. If not, a 0Ω resistor can be used instead of the parallel and C pz .

[0034] Figure 5 , the first stage operational amplifier circuit is an integrating circuit, and Figure 4 The second stage operational amplifier circuit is an inverting amplifier. Figure 3 The two-stage operational amplifier circuit is connected in parallel. and C pz , they are related to the inverting amplifier circuit Together they form a pole-zero cancellation network. Whether a pole-zero cancellation network is needed can be determined based on the specific application scenario. If not, a 0Ω resistor can be used to replace the parallel and C pz .

[0035] Figure 2 and Figure 3 It is a current sensitive amplifier that can maintain the shape of the detector output current pulse to the greatest extent possible. Figure 4 and Figure 5 It is a charge sensitive amplifier, suitable for scenarios where the output charge of the detector needs to be measured.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A 32-channel integrated multi-type preamplifier PCB board, characterized in that: The invention comprises 10 circuit layers, namely, component layer, ground plane 1, wiring layer 1, power plane 1, wiring layer 2, ground plane 2, wiring layer 3, power plane 2, wiring layer 4 and bottom layer in sequence; four types of preamplifiers are arranged on the component layer, and all preamplifier inputs and outputs are respectively concentrated on a row connector, the row connector has 4 rows and 8 columns, the 1st and 3rd columns are on wiring layer 1, the 2nd and 4th columns are on wiring layer 2, the 5th and 7th columns are on wiring layer 3, and the 6th and 8th columns are on wiring layer 4; all internal wiring layers except signal lines and both sides thereof are covered with copper, and the copper is grounded; ground plane 1 provides positive and negative power supply tracks for two different types and non-adjacent preamplifiers; ground plane 2 provides positive and negative power supply tracks for other two different types and non-adjacent preamplifiers; power plane 1, power plane 2, ground plane 1 and ground plane 2 provide reference layers for upper and lower adjacent signal wirings; the bottom layer is a copper-clad ground plane.

2. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: The adjacent signal pins of the row connector are separated by two pins, which are grounding pins and power pins respectively; the inner signal wiring of the circuit layer is all strip lines, the inner signal lines are all arranged in parallel, and the impedance is designed to be 50Ω.

3. The 32-channel integrated multi-type preamplifier PCB board according to claim 2, characterized in that: Set the direction parallel to the circuit board as the horizontal direction. If the adjacent signal lines in the horizontal direction are on the same layer, the minimum horizontal spacing is more than 4 times the line width; if the adjacent signal lines in the horizontal direction are separated by one layer, the minimum horizontal spacing is more than 2 times the line width; If adjacent signal lines in the horizontal direction are separated by two layers, the minimum horizontal spacing is 0 or greater.

4. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: A grounding guard ring is set around each amplifier, and necessary grounding stitching holes are set on the guard ring, the edge of the circuit board, and on both sides of each inner signal line.

5. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: Each amplifier consists of two operational amplifiers, C c is the AC coupling capacitor between the detector and c is the terminating resistor for achieving terminal impedance matching, R o It is the termination resistor to achieve source end matching.

6. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: One type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit; the first-stage operational amplifier circuit is a transimpedance circuit that realizes the conversion of the detector output current to voltage, and the gain is For the compensation capacitor, and It is also set to achieve circuit stability. If the circuit has no stability problem, or can be adjusted only To make it stable, you can not install and The second stage operational amplifier circuit is a common-phase amplifier. and are the feedback resistor and the feedback capacitor respectively, and the gain is adjust Minimize the amplifier output DC bias, Can reduce Contribution to output noise. If there is no output DC bias problem, it can be omitted. and 7. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: One type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit, wherein the first-stage operational amplifier circuit is a transimpedance circuit, and the second-stage operational amplifier circuit is an inverting amplifier. and are the feedback resistor and the feedback capacitor respectively, and the gain is adjust Minimize the amplifier output DC bias, Can reduce Contribution to output noise; If there is no output DC bias problem, do not install and 8. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: One type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit. The first-stage operational amplifier circuit is an integration circuit that integrates the detector output current and outputs an amplitude Proportional to the total output charge Q of the detector; is the feedback resistor, and the time constant of the exponential decay part of the output signal of the integration circuit is and It is set to achieve circuit stability. If the circuit has no stability problem, it can be omitted. and The second stage operational amplifier circuit is in-phase amplification, and there is a parallel connection between the two stages of operational amplifier circuits. and C pz , they are the same as the in-phase amplifier circuit Together they form a pole-zero cancellation network to adjust the attenuation speed of the output signal of the integration circuit; whether a pole-zero cancellation network is needed can be determined according to the specific application scenario. If not, a 0Ω resistor can be used instead of the parallel and C pz .

9. The 32-channel integrated multi-type preamplifier PCB board according to claim 1, characterized in that: One type of preamplifier includes a first-stage operational amplifier circuit and a second-stage operational amplifier circuit. The first-stage operational amplifier circuit is an integrating circuit, the second-stage operational amplifier circuit is an inverting amplifier, and the two-stage operational amplifier circuits are connected in parallel. and C pz , they are related to the inverting amplifier circuit Together they form a pole-zero cancellation network. Whether a pole-zero cancellation network is needed can be determined based on the specific application scenario. If not, a 0Ω resistor can be used to replace the parallel and C pz .

Images