Highly consistent eight-channel operational amplifier

Abstract

The application relates to the field of integrated circuit design and manufacturing technology, and provides a high-consistency eight-channel operational amplifier, which solves the technical problem of how to optimize the mismatch between different channels and improve the consistency of signal processing between different channels for the layout structure of an existing operational amplifier, and comprises a reference and bias module, eight operation modules, six metal layers, a power line, a ground line, two groups of bias lines, eight enable signal lines, eight non-inverting input signal lines, eight inverting input signal lines, the eight operation modules are uniformly arranged in a ring around the reference and bias module, the bias lines are connected with the eight operation modules, the power line and the ground line are connected with each module, and the eight enable signal lines, the eight non-inverting input signal lines, the eight inverting input signal lines and the eight output signal lines are connected with the eight operation modules respectively. The application realizes efficient integration and miniaturization, the performance consistency of the eight operation modules is high, and the application is widely used in the field of integrated circuits.

Description

Technical Field

[0001] This invention relates to the field of integrated circuit design and manufacturing technology, and more specifically, to a highly consistent eight-channel operational amplifier. Background Technology

[0002] Operational amplifiers (OPAs) are high-gain voltage signal amplification integrated circuits widely used in various electronic circuits. With the continuous development of applications such as medical detectors, industrial inspection, and precision instruments, the requirements for the integration level of OPAs are becoming increasingly stringent, creating an urgent need for miniaturized, high-precision, multi-channel OPAs. The demand for multi-channel signal acquisition and processing is particularly urgent in the medical detector field.

[0003] As a core component for realizing the functions and ensuring the performance of integrated circuits, the rationality and optimization of layout design play a decisive role in the overall performance of miniaturized, multi-channel operational amplifiers.

[0004] Existing technology layout designs focus on mismatch optimization within a single channel, and related technical solutions mainly revolve around the operational amplifier's own mismatch problem. Typical layout design solutions include common-centroid placement, Guard Ring isolation, and layered routing. Specifically, common-centroid placement, by arranging the core components of the operational amplifier (such as differential pairs and current source transistors) around a common centroid, can effectively offset the device parameter deviations caused by process gradients and temperature gradients during chip manufacturing, thereby reducing the degree of mismatch within a single channel. Guard Ring isolation technology, by placing a doped guard ring around the core circuit area, can block external noise signals from penetrating inward, while reducing internal signal leakage and improving its anti-interference capability. Layered routing technology arranges different types of signals (such as power signals, small signals, and digital control signals) on different metal wiring layers, avoiding coupling interference caused by different signals being routed on the same layer, further optimizing internal signal integrity. While these technical solutions are effective in optimizing single-channel mismatch, they are insufficient in optimizing mismatch between different channels. In multi-channel integrated applications, it is not only necessary to ensure the low mismatch characteristics of a single channel, but also the consistency between different channels. Mismatch between channels will directly lead to deviations in signal acquisition and processing, reducing the overall accuracy of the system. Therefore, technical means are needed to ensure the consistency of signal processing for each channel. Summary of the Invention

[0005] This application aims to solve the technical problem of how to optimize the mismatch between different channels and improve the signal processing consistency between different channels in the existing operational amplifier layout structure, and provides a highly efficient integrated, highly consistent eight-channel operational amplifier.

[0006] To ensure the performance consistency of the eight operational channels of the operational amplifier, a high-matching architecture of "central reference multiplexing + ring symmetrical layout" is adopted.

[0007] This application provides a high-consistency eight-channel operational amplifier, including a reference and bias module, operational module one, operational module two, operational module three, operational module four, operational module five, operational module six, operational module seven and operational module eight, with the eight operational modules arranged in a uniform ring around the reference and bias module;

[0008] The high-consistency eight-channel operational amplifier also includes a first metal layer, a second metal layer, a third metal layer, a fourth metal layer, a fifth metal layer, a sixth metal layer, power lines, a ground line, two sets of bias lines, eight enable signal lines, eight non-inverting input signal lines, eight inverting input signal lines, and eight output signal lines. The bias lines are connected to eight operational modules, the power lines are connected to the reference and bias modules and the eight operational modules, the ground line is connected to the reference and bias modules and the eight operational modules, and the eight enable signal lines are connected to operational modules one, two, three, four, five, six, seven, and eight respectively. The enable terminal of module 8 is connected; the eight non-inverting input signal lines are connected to the non-inverting input terminals of operational modules 1, 2, 3, 4, 5, 6, 7, and 8 respectively; the eight inverting input signal lines are connected to the inverting input terminals of operational modules 1, 2, 3, 4, 5, 6, 7, and 8 respectively; and the eight output signal lines are connected to the output terminals of operational modules 1, 2, 3, 4, 5, 6, 7, and 8 respectively.

[0009] Preferably, the central axis of the reference and offset modules is set as the X-axis auxiliary line and the Y-axis auxiliary line. Operation modules two and seven are symmetrically arranged along the X-axis auxiliary line, and operation modules four and five are symmetrically arranged along the Y-axis auxiliary line. The distance between operation module two and the reference and offset modules is 'a', and the distance between operation module four and the reference and offset modules is 'b', where a = b. Operation modules one and three are located on either side of operation module two, and are symmetrically arranged along the Y-axis auxiliary line. Operation modules six and eight are located on either side of operation module seven, and are symmetrically arranged along the Y-axis auxiliary line. Operation module eight is arranged symmetrically with the Y-axis auxiliary line; operation modules one and six are located on both sides of operation module four, and are arranged symmetrically with the X-axis auxiliary line; operation modules three and eight are located on both sides of operation module five, and are arranged symmetrically with the X-axis auxiliary line; the distance between operation modules one and two is c, the distance between operation modules one and four is d, c=d; the distance between operation modules six and seven is e, the distance between operation modules six and four is f, e=f; f=d;

[0010] The offset line includes a rectangular trunk and six branches, namely Branch 1, Branch 2, Branch 3, Branch 4, Branch 5, and Branch 6. The first and second transverse portions of the rectangular trunk are located in the fourth metal layer, and the first and second longitudinal portions are located in the third metal layer. One end of the first longitudinal portion is connected to one end of the first transverse portion through a through-hole, and the other end of the first longitudinal portion is connected to one end of the second transverse portion through a through-hole. One end of the second longitudinal portion is also connected to the other end of the first transverse portion through a through-hole. One end is connected, and the other end of the second vertical section is connected to the other end of the second horizontal section through a through hole; the vertical section of branch line one is located in the third metal layer, and the horizontal section of branch line one is located in the fourth metal layer. The horizontal section of branch line one is connected to the vertical section of branch line one through a through hole, and the vertical section of branch line one is connected to the first vertical section in the rectangular trunk line; the horizontal section of branch line one is connected to computing module one and computing module two respectively; the vertical section of branch line two is located in the third metal layer, and the horizontal section of branch line two is located in the fourth metal layer, and the horizontal section of branch line two... The vertical portion of branch line two is connected to the second vertical portion of the rectangular main line via through holes. The horizontal portion of branch line two is connected to the third processing module. Branch line three is located on the fourth metal layer and is connected to the first vertical portion of the rectangular main line via through holes. Branch line three is also connected to the fourth processing module. Branch line four is located on the fourth metal layer and is connected to the second vertical portion of the rectangular main line via through holes. Branch line four is also connected to the fifth processing module. The vertical portion of branch line five is located on the third metal layer, and the horizontal portion of branch line five is located on the third metal layer. In the fourth metal layer, the horizontal portion of branch line five is connected to the vertical portion of branch line five through a through hole. The vertical portion of branch line five is connected to the first vertical portion of the rectangular trunk line. The horizontal portion of branch line five is connected to the sixth computing module. The vertical portion of branch line six is ​​located in the third metal layer, and the horizontal portion of branch line six is ​​located in the fourth metal layer. The horizontal portion of branch line six is ​​connected to the vertical portion of branch line six through a through hole. The vertical portion of branch line six is ​​connected to the second vertical portion of the rectangular trunk line. The horizontal portion of branch line six is ​​connected to the seventh computing module and the eighth computing module, respectively.

[0011] The power cord is rectangular in shape and includes a first horizontal line, a second horizontal line, a first vertical line, a second vertical line, a first horizontal extension, and a second horizontal extension. The first and second horizontal lines are located on the 6th metal layer, and the first and second vertical lines are located on the 5th metal layer. The two horizontal lines on the 6th metal layer and the two vertical lines on the 5th metal layer are connected by through holes to form a rectangle. The first and second horizontal extensions are located on the 6th metal layer. The first horizontal extension is connected to the first vertical line through a through hole, and the second horizontal extension is connected to the second vertical line through a through hole. The first horizontal line is connected to the power terminals of operation modules 1, 2, and 3, respectively. The second horizontal line is connected to the power terminals of operation modules 6, 7, and 8, respectively. The first horizontal extension is connected to the power terminals of operation module 4 and the reference and bias modules, respectively. The second horizontal extension is connected to the power terminal of operation module 5.

[0012] The ground wire is rectangular in shape and includes a first outer horizontal line, a second outer horizontal line, a first outer vertical line, a second outer vertical line, a first inner horizontal line, a second inner horizontal line, a first inner horizontal extension, and a second inner horizontal extension. The first and second outer horizontal lines are located in the 6th metal layer, and the first and second outer vertical lines are located in the 5th metal layer. The two outer horizontal lines in the 6th metal layer and the two outer vertical lines in the 5th metal layer are connected by through-holes to form a rectangle. One end of the first inner horizontal line is connected to the first outer vertical line through a through-hole, and the other end of the first inner horizontal line is connected to the second outer vertical line through a through-hole. One end of the inner horizontal line is connected to the first outer vertical line through a through hole, and the other end of the second inner horizontal line is connected to the second outer vertical line through a through hole. The first inner horizontal extension is connected to the second outer vertical line through a through hole, and the second inner horizontal extension is connected to the first outer vertical line through a through hole. The first inner horizontal line is connected to the grounding terminals of operation module one, operation module two, and operation module three, respectively. The second inner horizontal line is connected to the grounding terminals of operation module six, operation module seven, and operation module eight, respectively. The first inner horizontal extension is connected to the grounding terminal of operation module five, and the second inner horizontal extension is connected to the grounding terminals of operation module four and the reference and bias modules, respectively.

[0013] Eight enable signal lines are located on the second metal layer, eight positive input signal lines are located on the second metal layer, eight negative input signal lines are located on the second metal layer, and eight output signal lines are located on the second metal layer.

[0014] Preferably, the reference and bias module, operation module 1, operation module 2, operation module 3, operation module 4, operation module 5, operation module 6, operation module 7, and operation module 8 are all surrounded by Guard Ring isolation structures. The first inner horizontal line of the ground wire is connected to the Guard Ring isolation structures corresponding to operation module 1, operation module 2, and operation module 3, respectively. The second inner horizontal line of the ground wire is connected to the Guard Ring isolation structures corresponding to operation module 6, operation module 7, and operation module 8, respectively. The first inner horizontal extension of the ground wire is connected to the Guard Ring isolation structure corresponding to operation module 5, and the second inner horizontal extension of the ground wire is connected to the Guard Ring isolation structures corresponding to operation module 4 and the reference and bias module, respectively.

[0015] The beneficial effects of this application are that the operational amplifier has eight channels, achieving high-efficiency integration and miniaturization. The eight-channel operational amplifier is arranged in a ring, with the reference and bias modules centrally positioned and reused. The eight channels arranged in a ring, along with the ring power line, ring ground line, and ring bias voltage line, ensure the consistency of operating conditions for each channel, fundamentally improving channel matching. Mismatch optimization between different channels ensures consistency. This is conducive to the miniaturization and portability of medical electronic devices, aligning with the industrial trend of lightweight and low-cost medical equipment.

[0016] This has promoted the performance improvement and industrial application of multi-channel integrated circuits.

[0017] This reduces chip manufacturing and packaging costs.

[0018] Further features and aspects of this application will be clearly described in the following detailed description with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the layout of a high-consistency eight-channel operational amplifier;

[0020] Figure 2 This is the circuit schematic of a high-consistency eight-channel operational amplifier;

[0021] Figure 3 Is Figure 1 Based on this, mark the central axis auxiliary lines, namely the X-axis auxiliary line and the Y-axis auxiliary line;

[0022] Figure 4 It is a layout structure of a highly consistent eight-channel operational amplifier;

[0023] Figure 5 Is Figure 4 Based on the layout structure shown, power lines, ground lines, and offset lines are annotated with different colors.

[0024] Figure 6 Is Figure 4 The isolation structure and central axis auxiliary lines are marked on the basis of the layout shown;

[0025] Figure 7 yes Figure 4 The layout shown includes the structure of power lines and ground lines.

[0026] Figure 8 yes Figure 4 The layout structure shown includes the structural diagrams of the first and second offset lines.

[0027] Figure 9 yes Figure 4 The layout shown is a structural diagram of the isolation structure;

[0028] Figure 10 This is a schematic diagram of the six metal layers of an eight-channel operational amplifier along the Z-axis, namely the first metal layer, the second metal layer, the third metal layer, the fourth metal layer, the fifth metal layer, and the sixth metal layer.

[0029] Figure 11 Is Figure 7 Based on the layout structure shown, mark the components of the power line and the ground line;

[0030] Figure 12 Is Figure 5 Based on this, mark the various parts of the first offset line;

[0031] Figure 13 Is Figure 5 Based on this, mark the various parts of the second offset line;

[0032] Figure 14 yes Figure 11 Based on this, mark the power lines, ground lines and the connection structure diagram of each module.

[0033] Explanation of symbols in the diagram:

[0034] 1. Power line, 1-1. First horizontal line, 1-2. Second horizontal line, 1-3. First vertical line, 1-4. Second vertical line, 1-5. First horizontal extension, 1-6. Second horizontal extension; 2. Ground line, 2-1. First outer horizontal line, 2-2. Second outer horizontal line, 2-3. First outer vertical line, 2-4. Second outer vertical line, 2-5. First inner horizontal line, 2-6. Second inner horizontal line, 2-7. First inner horizontal extension, 2-8. Second inner horizontal extension; 3. Isolation structure; 4. First offset line, 4-1. First horizontal portion, 4-2. Second horizontal portion, 4-3. First vertical portion, 4-4. Second vertical portion, 4-5. Vertical portion of branch line one, 4-6. Horizontal portion of branch line one, 4-7. Vertical portion of branch line two, 4-8. The transverse portion of branch line 2, 4-9. Branch line 3, 4-10. Branch line 4, 4-11. The longitudinal portion of branch line 5, 4-12. The transverse portion of branch line 5, 4-13. The longitudinal portion of branch line 6, 4-14. The transverse portion of branch line 6; 5. Second offset line, 5-1. First transverse portion, 5-2. Second transverse portion, 5-3. First longitudinal portion, 5-4. Second longitudinal portion, 5-5. The longitudinal portion of branch line 1, 5-6. The transverse portion of branch line 1, 5-7. The longitudinal portion of branch line 2, 5-8. The transverse portion of branch line 2, 5-9. Branch line 3, 5-10. Branch line 4, 5-11. The longitudinal portion of branch line 5, 5-12. The transverse portion of branch line 5, 5-13. The longitudinal portion of branch line 6, 5-14. The transverse portion of branch line 6. Detailed Implementation

[0035] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] The specific embodiments described below are merely preferred embodiments of this application, and the scope of protection of this application is not limited thereto. Those skilled in the art can make modifications or variations based on the principles, concepts, and spirit of this application, and the resulting technical solutions should all be covered within the scope of protection of this application.

[0037] To ensure the performance consistency of the eight operational channels of the operational amplifier, a high-matching architecture of "central reference multiplexing + ring symmetrical layout" is adopted.

[0038] like Figures 1 to 13As shown, the high-consistency eight-channel operational amplifier is configured with a reference and bias module, operational module 1, operational module 2, operational module 3, operational module 4, operational module 5, operational module 6, operational module 7, and operational module 8. These modules are distributed along the areas indicated by the X-axis and Y-axis auxiliary lines. The reference and bias module, located at the geometric center of the layout and designed for reuse, is responsible for generating stable reference voltage and bias current, and is the core unit ensuring consistent performance across all channels. The eight operational modules are arranged in a uniform ring around the reference and bias module. This layout ensures that the physical and electrical distances from each operational module to the reference and bias module are similar, effectively avoiding inconsistent bias signal delay or attenuation caused by differences in wiring length. Simultaneously, the ring arrangement makes the layout environment (such as temperature distribution and process deviation areas) of each operational module similar, further improving the matching accuracy between channels. Specifically, the X-axis auxiliary line is the central axis of the reference and offset modules, and the Y-axis auxiliary line is the central axis of the reference and offset modules. Operation modules two and seven are arranged symmetrically with respect to the X-axis auxiliary line, and operation modules four and five are arranged symmetrically with respect to the Y-axis auxiliary line. The distance between operation module two and the reference and offset modules is 'a', and the distance between operation module four and the reference and offset modules is 'b', where a = b. Operation modules one and three are located on either side of operation module two, and are arranged symmetrically with respect to the Y-axis auxiliary line. Operation modules six and eight are located on either side of operation module seven. Module 6 and Module 8 are arranged symmetrically along the Y-axis auxiliary line. Module 1 and Module 6 are located on either side of Module 4. Module 1 and Module 6 are arranged symmetrically along the X-axis auxiliary line. Module 3 and Module 8 are located on either side of Module 5. Module 3 and Module 8 are arranged symmetrically along the X-axis auxiliary line. The distance between Module 1 and Module 2 is c, and the distance between Module 1 and Module 4 is d, where c=d. The distance between Module 6 and Module 7 is e, and the distance between Module 6 and Module 4 is f, where e=f and f=d.

[0039] To achieve uniform bias voltage transmission, the bias voltage traces utilize a ring-shaped wiring structure constructed with high-layer metal. High-layer metal offers lower sheet resistance and better anti-interference capabilities. The ring-shaped wiring allows the bias voltage to radiate evenly from the central reference module to all surrounding computing modules, ensuring that the electrical path length and voltage drop for each computing module to acquire the bias voltage are similar, fundamentally guaranteeing low inconsistency in the bias voltage across channels. The purple rectangle represents the Guard Ring isolation structure, and the red lines represent power lines. The solid lines represent the power lines located on the 6th metal layer (METAL6), while the dashed lines represent the power lines located on the 5th metal layer (METAL5). Using high-layer metal for power line traces results in lower impedance. The green line represents the ground line. The portion of the ground line represented by the solid line is located in the 6th metal layer (METAL6), and the portion represented by the dashed line is located in the 5th metal layer (METAL5). The orange line represents the first bias line (VB1). The portion of the first bias line represented by the solid line is located in the 4th metal layer (METAL4), and the portion represented by the dashed line is located in the 3rd metal layer (METAL3). The blue line represents the second bias line (VB2). The portion of the second bias line represented by the solid line is located in the 4th metal layer (METAL4), and the portion represented by the dashed line is located in the 3rd metal layer (METAL3).The first bias line VB1 includes a rectangular trunk and six branch lines. The six branch lines extend outwards. Branch line 1 (path 1) connects to computation module 1 and computation module 2 respectively; branch line 2 (path 2) connects to computation module 3; branch line 3 (path 3) connects to computation module 4; branch line 4 (path 4) connects to computation module 5; branch line 5 (path 5) connects to computation module 6; and branch line 6 (path 6) connects to computation module 7 and computation module 8 respectively. Two sections of the rectangular trunk line distributed along the X-axis auxiliary line (i.e., the first horizontal section 4-1 and the second horizontal section 4-2 arranged laterally) are... On the fourth metal layer (METAL4), two rectangular trunk lines distributed along the Y-axis auxiliary line (i.e., the first longitudinal portion 4-3 and the second longitudinal portion 4-4) are located on the third metal layer (METAL3). The two transversely arranged trunk lines and the two longitudinally arranged trunk lines are connected by through-holes to form a rectangle (i.e., one end of the first longitudinal portion 4-3 is connected to one end of the first transverse portion 4-1 through a through-hole, the other end of the first longitudinal portion 4-3 is connected to one end of the second transverse portion 4-2 through a through-hole, and one end of the second longitudinal portion 4-4 is connected to the first transverse portion 4-1 through a through-hole). The other end of 1 is connected, and the other end of the second longitudinal portion 4-4 is connected to the other end of the second transverse portion 4-2 through a through hole); the portion of branch 1 distributed along the Y-axis auxiliary line direction (i.e., the longitudinal portion 4-5 of branch 1) is located in the third metal layer METAL3, and the portion of branch 1 distributed along the X-axis auxiliary line direction (i.e., the transverse portion 4-6 of branch 1) is located in the fourth metal layer METAL4. The transverse portion 4-6 of branch 1 is connected to the longitudinal portion 4-5 of branch 1 through a through hole, and the longitudinal portion 4-5 of branch 1 is connected to the first longitudinal portion 4-3 in the rectangular trunk line; branch The horizontal portion 4-6 of branch line 1 is connected to operation module 1 and operation module 2 respectively. The portion of branch line 2 distributed along the Y-axis auxiliary line (i.e., the vertical portion 4-7 of branch line 2) is located in the 3rd metal layer METAL3, and the portion of branch line 2 distributed along the X-axis auxiliary line (i.e., the horizontal portion 4-8 of branch line 2) is located in the 4th metal layer METAL4. The horizontal portion 4-8 of branch line 2 is connected to the vertical portion 4-7 of branch line 2 through a through hole. The vertical portion 4-7 of branch line 2 is connected to the second vertical portion 4-4 in the rectangular main line. The horizontal portion 4-8 of branch line 2 is connected to operation module 3. Branch line 3 4-9 is located in the 4th metal layer METAL4 (branch line 3 4-9 is distributed horizontally). Branch line 3 4-9 is connected to the first vertical portion 4-3 in the rectangular main line through a through hole. Branch line 3 4-9 is connected to operation module 4. Branch line 4-10 is located in the fourth metal layer METAL4 (branch line 4-10 is distributed horizontally). Branch line 4-10 is connected to the second vertical part 4-4 in the rectangular main line through a through hole; branch line 4-10 is connected to the fifth computing module.The portion of branch line 5 distributed along the Y-axis auxiliary line (i.e., the longitudinal portion 4-11 of branch line 5) is located in the 3rd metal layer METAL3, and the portion of branch line 5 distributed along the X-axis auxiliary line (i.e., the transverse portion 4-12 of branch line 5) is located in the 4th metal layer METAL4. The transverse portion 4-12 of branch line 5 is connected to the longitudinal portion 4-11 of branch line 5 through a through hole. The longitudinal portion 4-11 of branch line 5 is connected to the first longitudinal portion 4-3 in the rectangular main line. The transverse portion 4-12 of branch line 5 is connected to the sixth calculation module. The portion of branch line 6 distributed along the Y-axis auxiliary line (i.e., the longitudinal portion 4-13 of branch line 6) is located in the 3rd metal layer METAL3, and the portion of branch line 6 distributed along the X-axis auxiliary line (i.e., the transverse portion 4-14 of branch line 6) is located in the 4th metal layer METAL4. The transverse portion 4-14 of branch line 6 is connected to the longitudinal portion 4-13 of branch line 6 through a through hole. The longitudinal portion 4-13 of branch line 6 is connected to the second longitudinal portion 4-4 of the rectangular main line. The transverse portion 4-14 of branch line 6 is connected to the operation module 7 and the operation module 8 respectively.

[0040] The second bias line VB2 includes a rectangular trunk and six branch lines. The six branch lines extend outwards. Branch line one connects to operation module one and operation module two, branch line two connects to operation module three, branch line three connects to operation module four, branch line four connects to operation module five, branch line five connects to operation module six, and branch line six connects to operation module seven and operation module eight. Two branches of the rectangular trunk along the X-axis auxiliary line (i.e., the first horizontal portion 5-1 and the second horizontal portion 5-2) are located in the fourth metal layer METAL4. Two branches of the rectangular trunk along the Y-axis auxiliary line (i.e., the first vertical portion 5-1 and the second horizontal portion 5-2) are located in the fourth metal layer METAL4. The first longitudinal portion 5-3 and the second longitudinal portion 5-4 are located in the third metal layer METAL3. The two transversely arranged main lines and the two longitudinally arranged main lines in the rectangle are connected by through holes to form a rectangle (that is, one end of the first longitudinal portion 5-3 is connected to one end of the first transverse portion 5-1 through a through hole, the other end of the first longitudinal portion 5-3 is connected to one end of the second transverse portion 5-2 through a through hole, one end of the second longitudinal portion 5-4 is connected to the other end of the first transverse portion 5-1 through a through hole, and the other end of the second longitudinal portion 5-4 is connected to the other end of the second transverse portion 5-2 through a through hole). The portion of branch line 1 distributed along the Y-axis auxiliary line (i.e., the longitudinal portion 5-5 of branch line 1) is located in the third metal layer METAL3, and the portion of branch line 1 distributed along the X-axis auxiliary line (i.e., the transverse portion 5-6 of branch line 1) is located in the fourth metal layer METAL4. The transverse portion 5-6 of branch line 1 is connected to the longitudinal portion 5-5 of branch line 1 through a through hole. The longitudinal portion 5-5 of branch line 1 is connected to the first longitudinal portion 5-3 in the rectangular trunk line. The transverse portion 5-6 of branch line 1 is connected to operation module 1 and operation module 2 respectively. The portion of branch line two distributed along the Y-axis auxiliary line (i.e., the longitudinal portion 5-7 of branch line two) is located in the third metal layer METAL3, and the portion of branch line two distributed along the X-axis auxiliary line (i.e., the transverse portion 5-8 of branch line two) is located in the fourth metal layer METAL4. The transverse portion 5-8 of branch line two is connected to the longitudinal portion 5-7 of branch line two through a through hole, and the longitudinal portion 5-7 of branch line two is connected to the second longitudinal portion 5-4 of the rectangular main line; the transverse portion 5-8 of branch line two is connected to the third computing module. Branch line three 5-9 is located in the fourth metal layer METAL4 (branch line three 5-9 is distributed transversely), and branch line three 5-9 is connected to the first longitudinal portion 5-3 of the rectangular main line through a through hole; branch line three 5-9 is connected to the fourth computing module. Branch line 4 5-10 is located in the fourth metal layer METAL4 (branch line 4 5-10 is distributed horizontally), and branch line 4 5-10 is connected to the second vertical part 5-4 in the rectangular main line through a through hole; branch line 4 5-10 is connected to the fifth computing module.The portion of branch line 5 distributed along the Y-axis auxiliary line (i.e., the longitudinal portion 5-11 of branch line 5) is located in the 3rd metal layer METAL3, and the portion of branch line 5 distributed along the X-axis auxiliary line (i.e., the transverse portion 5-12 of branch line 5) is located in the 4th metal layer METAL4. The transverse portion 5-12 of branch line 5 is connected to the longitudinal portion 5-11 of branch line 5 through a through hole. The longitudinal portion 5-11 of branch line 5 is connected to the first longitudinal portion 5-3 in the rectangular main line. The transverse portion 5-12 of branch line 5 is connected to the sixth calculation module. The portion of branch line 6 distributed along the Y-axis auxiliary line (i.e., the longitudinal portion 5-13 of branch line 6) is located in the 3rd metal layer METAL3, and the portion of branch line 6 distributed along the X-axis auxiliary line (i.e., the transverse portion 5-14 of branch line 6) is located in the 4th metal layer METAL4. The transverse portion 5-14 of branch line 6 is connected to the longitudinal portion 5-13 of branch line 6 through a through hole. The longitudinal portion 5-13 of branch line 6 is connected to the second longitudinal portion 5-4 of the rectangular trunk line. The transverse portion 5-14 of branch line 6 is connected to the operation module 7 and the operation module 8, respectively.

[0041] The power cord is rectangular in shape. Two horizontal lines (first horizontal line 1-1 and second horizontal line 1-2) distributed along the X-axis auxiliary line are located in the 6th metal layer (METAL6). Two vertical lines (first vertical line 1-3 and second vertical line 1-4) distributed along the Y-axis auxiliary line are located in the 5th metal layer (METAL5). The two horizontal lines in the 6th metal layer (METAL6) and the two vertical lines in the 5th metal layer (METAL5) are connected by through holes to form a rectangle. The power cord also has two inwardly extending first horizontal extensions 1-5 and second horizontal extensions 1-6. The first horizontal extensions 1-5 and second horizontal extensions 1-6 are located in the 6th metal layer (METAL6). The first horizontal extension 1-5 is connected to the first vertical line 1-3 through a through hole, and the second horizontal extension 1-6 is connected to the second vertical line 1-4 through a through hole.

[0042] The power supply lines supply power to the reference and bias module, and to the eight arithmetic modules (modules 1, 2, 3, 4, 5, 6, 7, and 8). In other words, the reference and bias module and the eight arithmetic modules share the same power supply line. Specifically, the first horizontal line 1-1 is connected to the power terminals of arithmetic modules 1, 2, and 3; the second horizontal line 1-2 is connected to the power terminals of arithmetic modules 6, 7, and 8; the first horizontal extension 1-5 is connected to the power terminals of arithmetic module 4 and the reference and bias module; and the second horizontal extension 1-6 is connected to the power terminal of arithmetic module 5.

[0043] The ground wire is rectangular in shape. Two outer horizontal lines (first outer horizontal line 2-1 and second outer horizontal line 2-2) distributed along the X-axis auxiliary line are located in the 6th metal layer METAL6. Two outer vertical lines (first outer vertical line 2-3 and second outer vertical line 2-4) distributed along the Y-axis auxiliary line are located in the 5th metal layer METAL5. The two outer horizontal lines in the 6th metal layer METAL6 and the two outer vertical lines in the 5th metal layer METAL5 are connected by through holes to form a rectangle. One end of the first inner transverse line 2-5 is connected to the first outer longitudinal line 2-3 through a through hole, and the other end of the first inner transverse line 2-5 is connected to the second outer longitudinal line 2-4 through a through hole. One end of the second inner transverse line 2-6 is connected to the first outer longitudinal line 2-3 through a through hole, and the other end of the second inner transverse line 2-6 is connected to the second outer longitudinal line 2-4 through a through hole. The first inner transverse extension 2-7 is connected to the second outer longitudinal line 2-4 through a through hole, and the second inner transverse extension 2-8 is connected to the first outer longitudinal line 2-3 through a through hole.

[0044] The ground wires are connected to the grounding terminals of the reference and bias module, and the eight operational modules (operation modules 1, 2, 3, 4, 5, 6, 7, and 8), respectively. In other words, the reference and bias module and the eight operational modules share the same ground wire. Specifically, the first inner horizontal line 2-5 is connected to the grounding terminals of operational modules 1, 2, and 3, respectively; the second inner horizontal line 2-6 is connected to the grounding terminals of operational modules 6, 7, and 8, respectively; the first inner horizontal extension 2-7 is connected to the grounding terminal of operational module 5; and the second inner horizontal extension 2-8 is connected to the grounding terminals of operational module 4 and the reference and bias module, respectively.

[0045] Figure 7 The power line 1 shown is power line AVDD, and the ground line 2 is ground line AVSS. Figure 4 and Figure 14 The locations of the eight channels are marked: namely, the locations of operation module one, operation module two, operation module three, operation module four, operation module five, operation module six, operation module seven, operation module eight, and the locations of the reference and offset modules.

[0046] like Figure 8 The diagram shows the structure of the first bias line 4 (i.e., the first bias line VB1) and the structure of the second bias line 5 (i.e., the second bias line VB2). Figure 8The location of operation module 1, operation module 2, operation module 3, operation module 4, operation module 5, operation module 6, operation module 7, and operation module 8 is displayed; the location of the reference and bias modules is also shown.

[0047] There are 8 enable signal lines, which act as control switches. These 8 enable signal lines are connected to the enable terminals (en terminals) of computation modules 1, 2, 3, 4, 5, 6, 7, and 8, respectively. The 8 enable signal lines are located on the second metal layer (METAL2).

[0048] There are 8 non-inverting input signal lines, which are connected to the non-inverting input terminals (vn terminals) of operational modules 1, 2, 3, 4, 5, 6, 7, and 8, respectively. These 8 non-inverting input signal lines are located on the second metal layer (METAL2).

[0049] There are 8 inverting input signal lines, which are connected to the inverting input terminals (VP ​​terminals) of operational modules 1, 2, 3, 4, 5, 6, 7, and 8, respectively. The 8 inverting input signal lines are located on the second metal layer (METAL2).

[0050] There are 8 output signal lines, which are connected to the output terminals (out terminals) of operation modules 1, 2, 3, 4, 5, 6, 7, and 8, respectively. The 8 output signal lines are located on the second metal layer (METAL2).

[0051] A Guard Ring isolation structure can be set up, which surrounds the reference and bias modules, and then surrounds the computation module one, the computation module two, the computation module three, the computation module four, the computation module five, the computation module six, the computation module seven, and the computation module eight. Each Guard Ring isolation structure is independent and connected to the ground line (specifically, the first inner horizontal line 2-5 of the ground line is connected to the Guard Ring isolation structures corresponding to operational modules 1, 2, and 3, respectively; the second inner horizontal line 2-6 is connected to the Guard Ring isolation structures corresponding to operational modules 6, 7, and 8, respectively; the first inner horizontal extension 2-7 is connected to the Guard Ring isolation structure corresponding to operational module 5; and the second inner horizontal extension 2-8 is connected to the Guard Ring isolation structures corresponding to operational module 4, the reference module, and the bias module, respectively). This forms an independent isolation barrier that effectively blocks signal crosstalk and power supply noise coupling between adjacent channels, while suppressing the transmission of substrate noise between channels. This minimizes the impact of power supply IR drop and noise interference on the performance of different channels, which is beneficial for improving the high consistency of the output characteristics of the eight operational amplifier modules. In this configuration, the ground wire passes through the Guard Ring isolation structure and connects to the corresponding module; the power wire passes through the Guard Ring isolation structure and connects to the corresponding module; the first bias wire passes through the Guard Ring isolation structure and connects to the corresponding module; and the second bias wire passes through the Guard Ring isolation structure and connects to the corresponding module. Related signal lines also pass through the Guard Ring isolation structure.

[0052] like Figure 9 As shown, there are 9 isolation structures 3 (isolation structures are Guard Rings). Figure 9 The location of operation module 1, operation module 2, operation module 3, operation module 4, operation module 5, operation module 6, operation module 7, and operation module 8 is displayed; the location of the reference and bias modules is also displayed.

[0053] The eight-channel operational amplifier, as a chip, has an outermost I / O unit with pads, which is a standard structure. Six metal layers are connected to the I / O unit.

[0054] An eight-channel operational amplifier was simulated using Virtuoso software. The gain error was calculated using channel one as a reference. The gain of operational module one was W1, the gain of operational module two was W2, the gain of operational module three was W3, the gain of operational module four was W4, the gain of operational module five was W5, the gain of operational module six was W6, the gain of operational module seven was W7, and the gain of operational module eight was W8. Using the gain W1 of operational module one as a reference, the percentage difference between the gains of the other seven operational modules and the gain W1 of operational module one was calculated. For example, the percentage difference between the gain W2 of operational module two and the gain W1 of operational module one was:

[0055]

[0056] By selecting the maximum value of 3.4% and the minimum value of 0.5% from the seven calculation results, the inconsistent results range from 0.5% to 3.4%. This demonstrates a high degree of consistency among the eight channels.

Claims

1. A high-uniformity eight-channel operational amplifier, characterized in that, It includes a reference and bias module, a calculation module 1, a calculation module 2, a calculation module 3, a calculation module 4, a calculation module 5, a calculation module 6, a calculation module 7, and a calculation module 8. The eight calculation modules are arranged in a uniform ring around the reference and bias module. The high-consistency eight-channel operational amplifier further includes a first metal layer, a second metal layer, a third metal layer, a fourth metal layer, a fifth metal layer, a sixth metal layer, power lines, a ground line, two sets of bias lines, eight enable signal lines, eight non-inverting input signal lines, eight inverting input signal lines, and eight output signal lines. The bias lines are connected to eight operational modules, the power lines are connected to the reference and bias module and the eight operational modules, the ground line is connected to the reference and bias module and the eight operational modules, and the eight enable signal lines are respectively connected to operational module one, operational module two, operational module three, operational module four, operational module five, operational module six, operational module seven, and operational module eight. The enable terminal of operation module eight is connected; the eight non-inverting input signal lines are respectively connected to the non-inverting input terminals of operation modules one, two, three, four, five, six, seven, and eight; the eight inverting input signal lines are respectively connected to the inverting input terminals of operation modules one, two, three, four, five, six, seven, and eight; and the eight output signal lines are respectively connected to the output terminals of operation modules one, two, three, four, five, six, seven, and eight.

2. The high-uniformity eight-channel operational amplifier according to claim 1, characterized in that, Using the central axis of the reference and offset modules as the X-axis auxiliary line and Y-axis auxiliary line, the operation modules two and seven are symmetrically arranged along the X-axis auxiliary line, and the operation modules four and five are symmetrically arranged along the Y-axis auxiliary line. The distance between the operation module two and the reference and offset modules is 'a', and the distance between the operation module four and the reference and offset modules is 'b', where a=b. The operation modules one and three are located on both sides of the operation module two, and are symmetrically arranged along the Y-axis auxiliary line. The operation modules six and eight are located on both sides of the operation module seven, and are symmetrically arranged along the Y-axis auxiliary line. Module 8 is symmetrically arranged with the Y-axis auxiliary line; Modules 1 and 6 are located on both sides of Module 4, and are symmetrically arranged with the X-axis auxiliary line; Modules 3 and 8 are located on both sides of Module 5, and are symmetrically arranged with the X-axis auxiliary line; the distance between Module 1 and Module 2 is c, the distance between Module 1 and Module 4 is d, and c=d; the distance between Module 6 and Module 7 is e, and the distance between Module 6 and Module 4 is f, and e=f; f=d; The offset line includes a rectangular trunk line and six branch lines, namely branch line one, branch line two, branch line three, branch line four, branch line five, and branch line six. The first and second transverse portions of the rectangular trunk line are located in the fourth metal layer, and the first and second longitudinal portions of the rectangular trunk line are located in the third metal layer. One end of the first longitudinal portion is connected to one end of the first transverse portion through a through-hole, and the other end of the first longitudinal portion is connected to one end of the second transverse portion through a through-hole. One end of the second longitudinal portion is connected to the first transverse portion through a through-hole. The other end of the branch line is connected, and the other end of the second longitudinal section is connected to the other end of the second transverse section through a through hole; the longitudinal section of the first branch line is located in the third metal layer, the transverse section of the first branch line is located in the fourth metal layer, the transverse section of the first branch line is connected to the longitudinal section of the first branch line through a through hole, and the longitudinal section of the first branch line is connected to the first longitudinal section of the rectangular trunk line; the transverse section of the first branch line is connected to the first computing module and the second computing module respectively; the longitudinal section of the second branch line is located in the third metal layer, the transverse section of the second branch line is located in the fourth metal layer, and the branch line... The horizontal portion of branch line 2 is connected to the vertical portion of branch line 2 via a through hole. The vertical portion of branch line 2 is connected to the second vertical portion of the rectangular main line. The horizontal portion of branch line 2 is connected to the third processing module. Branch line 3 is located in the fourth metal layer. Branch line 3 is connected to the first vertical portion of the rectangular main line via a through hole. Branch line 3 is also connected to the fourth processing module. Branch line 4 is located in the fourth metal layer. Branch line 4 is connected to the second vertical portion of the rectangular main line via a through hole. Branch line 4 is also connected to the fifth processing module. The vertical portion of branch line 5 is located in the third metal layer. The horizontal portion of branch line 5... The branch line is located in the fourth metal layer. The horizontal part of the branch line five is connected to the vertical part of the branch line five through a through hole. The vertical part of the branch line five is connected to the first vertical part of the rectangular main line. The horizontal part of the branch line five is connected to the operation module six. The vertical part of the branch line six is ​​located in the third metal layer. The horizontal part of the branch line six is ​​located in the fourth metal layer. The horizontal part of the branch line six is ​​connected to the vertical part of the branch line six through a through hole. The vertical part of the branch line six is ​​connected to the second vertical part of the rectangular main line. The horizontal part of the branch line six is ​​connected to the operation module seven and the operation module eight respectively. The power line is rectangular in shape and includes a first horizontal line, a second horizontal line, a first vertical line, a second vertical line, a first horizontal extension, and a second horizontal extension. The first and second horizontal lines are located on the 6th metal layer, and the first and second vertical lines are located on the 5th metal layer. The two horizontal lines on the 6th metal layer and the two vertical lines on the 5th metal layer are connected by through holes to form a rectangle. The first and second horizontal extensions are located on the 6th metal layer. The first horizontal extension is connected to the first vertical line through a through hole, and the second horizontal extension is connected to the second vertical line through a through hole. The first horizontal line is connected to the power terminals of computing modules 1, 2, and 3, respectively. The second horizontal line is connected to the power terminals of computing modules 6, 7, and 8, respectively. The first horizontal extension is connected to the power terminals of computing module 4 and the reference and bias modules, respectively. The second horizontal extension is connected to the power terminal of computing module 5. The ground wire is rectangular in shape and includes a first outer horizontal line, a second outer horizontal line, a first outer vertical line, a second outer vertical line, a first inner horizontal line, a second inner horizontal line, a first inner horizontal extension, and a second inner horizontal extension. The first and second outer horizontal lines are located in the 6th metal layer, and the first and second outer vertical lines are located in the 5th metal layer. The two outer horizontal lines in the 6th metal layer and the two outer vertical lines in the 5th metal layer are connected by through-holes to form a rectangle. One end of the first inner horizontal line is connected to the first outer vertical line through a through-hole, and the other end of the first inner horizontal line is connected to the second outer vertical line through a through-hole. One end of the inner horizontal line is connected to the first outer vertical line through a through hole, and the other end of the second inner horizontal line is connected to the second outer vertical line through a through hole. The first inner horizontal extension is connected to the second outer vertical line through a through hole, and the second inner horizontal extension is connected to the first outer vertical line through a through hole. The first inner horizontal line is connected to the grounding terminals of the first, second, and third arithmetic modules respectively. The second inner horizontal line is connected to the grounding terminals of the sixth, seventh, and eighth arithmetic modules respectively. The first inner horizontal extension is connected to the grounding terminal of the fifth arithmetic module, and the second inner horizontal extension is connected to the grounding terminals of the fourth arithmetic module and the reference and bias modules respectively. The 8 enable signal lines are located on the second metal layer, the 8 positive input signal lines are located on the second metal layer, the 8 negative input signal lines are located on the second metal layer, and the 8 output signal lines are located on the second metal layer.

3. The high-uniformity eight-channel operational amplifier according to claim 2, characterized in that, The reference and bias module, operation module one, operation module two, operation module three, operation module four, operation module five, operation module six, operation module seven, and operation module eight are all surrounded by guard ring isolation structures. The first inner horizontal line of the ground wire is connected to the guard ring isolation structures corresponding to operation module one, operation module two, and operation module three, respectively. The second inner horizontal line of the ground wire is connected to the guard ring isolation structures corresponding to operation module six, operation module seven, and operation module eight, respectively. The first inner horizontal extension of the ground wire is connected to the guard ring isolation structure corresponding to operation module five, and the second inner horizontal extension of the ground wire is connected to the guard ring isolation structures corresponding to operation module four and the reference and bias module, respectively.

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