CN114520633A - Doherty power amplifier based on small-sized orthogonal signal generator - Google Patents

Abstract

The invention discloses a Doherty power amplifier based on a small-sized orthogonal signal generator, relates to a microelectronic circuit, and aims to solve the problem of miniaturization of the orthogonal signal generator. The orthogonal signal generator comprises four layers of metals which are sequentially stacked from top to bottom: the second metal layer forms an I-path differential signal output circuit with an annular structure, and a fracture is formed for line segments which are in cross interference in the same plane to pass through; the third metal layer forms a Q-path differential signal output circuit with an annular structure, and a fracture is formed for the crossed and interfered line segments in the same plane to pass through; the first metal layer and the fourth metal layer are provided with a plurality of cross-line segments for connecting two ends of each fracture; the annular structure of the third metal layer is superposed with the annular structure of the second metal layer in the vertical direction, and each cross line segment of the first metal layer is superposed with the cross line segment of the fourth metal layer in the vertical direction. The transformer has the advantages that the area is reduced by a half, the coupling coefficient of the transformer is increased, and the loss is reduced.

Description

A Doherty Power Amplifier Based on Small Quadrature Signal Generator

technical field

The invention relates to microelectronic circuits, in particular to a Doherty power amplifier based on a small quadrature signal generator.

Background technique

The power amplifier is usually the most power-consuming module in the wireless transceiver, and its performance basically determines the energy efficiency and linearity of the entire wireless transmitter system. With the development of wireless communication technology, people utilize abundant millimeter-wave spectrum resources to achieve high data rates of wireless systems. In order to obtain a larger data transmission rate, high-order orthogonal frequency division multiplexing and orthogonal amplitude modulation are usually used. However, the resulting high peak-to-average power ratio places stringent requirements on the power back-off efficiency of the power amplifier, as well as high linearity requirements over a wide power range of its amplitude and phase response to ensure signal-free transmission . As one of the most important modules in the front-end of a wireless communication system, the power back-off efficiency of the power amplifier greatly affects the efficiency of the system. Among various power back-off efficiency enhancement technologies, Doherty technology is considered to be one of the most promising options. It supports broadband modulation in 5G applications, through the co-design of the main and auxiliary power amplifiers, through the active load modulation to improve power back-off efficiency. In order to meet the requirements of low latency and large bandwidth required by 5G communication systems, millimeter wave and terahertz technologies will be widely used to realize the interconnection of everything.

On the premise of ensuring basic indicators such as output power, efficiency, and linearity, the area of Doherty power amplifiers has always been a difficult point in power amplifier design. In order to apply the Doherty amplifier to the system, its miniaturization is imperative. In the past decade, silicon-based millimeter-wave Doherty power amplifiers have made significant progress, and the quadrature signal generation circuit at the input usually adopts 1/4 wavelength transmission line, Lange coupler, polyphase filter and other structures, which occupy the A larger chip area is required, so that the overall Doherty power amplifier has a larger chip area. How to realize the miniaturized quadrature signal generator is of great significance to the miniaturization of Doherty power amplifier.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a Doherty power amplifier based on a small quadrature signal generator to solve the above-mentioned problems in the prior art.

In the Doherty power amplifier based on a small quadrature signal generator according to the present invention, the I-channel differential signal of the quadrature signal generator is amplified by the main circuit and then enters the I-channel input of the output power combiner, while the Q-channel differential signal passes through After the auxiliary circuit is amplified, it enters the Q-channel input, and the output power combiner synthesizes the amplified I-channel differential signal and the Q-channel differential signal and outputs it externally;

The quadrature signal generator is composed of a first metal layer, a second metal layer, a third metal layer and a fourth metal layer stacked in sequence from top to bottom, wherein the first metal layer is electrically connected to the second metal layer, The second metal layer is insulated and connected to the third metal layer, and the third metal layer is electrically connected to the fourth metal layer:

The second metal layer forms an I-channel differential signal output line of a ring structure, and is provided with a fracture for the intersecting and interfering line segments in the same plane to pass through;

The third metal layer forms a Q-channel differential signal output line of a ring structure, and is provided with a fracture for the intersecting and interfering line segments in the same plane to pass through;

The first metal layer is provided with a plurality of spanning line segments for connecting two ends of each fracture of the second metal layer in a one-to-one correspondence;

The fourth metal layer is provided with a plurality of spanning line segments for connecting two ends of each fracture of the third metal layer in a one-to-one correspondence;

The annular structure of the third metal layer overlaps with the annular structure of the second metal layer in the vertical direction, and each spanning line segment of the first metal layer overlaps the spanning line segment of the fourth metal layer in the vertical direction.

The I-channel differential signal lines are partially overlapped in the middle of the quadrature signal generator.

The I-channel differential signal line is a 1.5-turn ring-shaped structure.

The second metal layer includes a first I route segment located in the outer circle of the first quadrant, a second I route segment extending from the fourth quadrant middle circle to the second quadrant inner circle through the third quadrant inner circle, and from the first The third I route segment extending from the middle quadrant circle to the fourth quadrant outer circle, the fourth I route segment extending from the second quadrant outer circle to the third quadrant middle circle, and extending from the second quadrant middle circle through the first quadrant inner circle to the fifth I route segment in the inner circle of the fourth quadrant, and the sixth I route segment located in the outer circle of the third quadrant; wherein the first I route segment extends away from the end of the first input lead out of the first I route output lead, A first top layer fracture is formed between the end of the output lead far away from the first I route and the end of the second I route segment located in the fourth quadrant; the fifth I route segment is located at the end of the fourth quadrant and the fourth I route segment is located in the fourth quadrant. A second top layer fracture is formed between the ends of the third quadrant, the fourth I route segment is located at the end of the first quadrant and extends out the second I-way output lead; the sixth I route segment is far from the end of the second I-way output lead The second input lead is extended, and a third top layer fracture is formed between the end of the second input lead and the end of the fifth I route segment located in the second quadrant; the third I route segment is far away from the end of the first I route output lead The first input lead is extended from the first input lead, and a fourth top layer fracture is formed between the end away from the first input lead and the end of the second I route segment located in the second quadrant;

The first metal layer includes a first top layer jumper segment for connecting to the first top layer fracture, a second top layer jumper segment for connecting to the second top layer fracture, and a second top layer jumper for connecting to the third top layer. a third top-level spanning line segment of the top-level fracture, and a fourth top-level spanning line segment for connecting the fourth top-level fracture;

The third metal layer includes a first Q route segment located in the outer circle of the first quadrant, a second Q route segment extending from the middle circle of the fourth quadrant to the inner circle of the second quadrant through the inner circle of the third quadrant, and a second Q route segment extending from the middle circle of the fourth quadrant to the inner circle of the second quadrant. The third Q route segment extending from the middle quadrant circle to the outer circle of the fourth quadrant, the fourth Q route segment extending from the outer circle of the second quadrant to the middle circle of the third quadrant, and extending from the middle circle of the second quadrant through the inner circle of the first quadrant to the fifth Q route segment in the inner circle of the fourth quadrant, and the sixth Q route segment located in the outer circle of the third quadrant; wherein the first Q route segment extends away from the end of the first Q route output lead out of the first isolation lead, A first bottom layer fracture is formed between the end away from the first isolation lead and the end of the second Q route segment located in the fourth quadrant; the fifth Q route segment is located at the end of the fourth quadrant and the fourth Q route segment is located in the third A second bottom layer fracture is formed between the ends of the quadrants, the fourth Q route segment is located at the end of the first quadrant and a second isolation lead is extended; the end of the sixth Q route segment away from the end of the second isolation lead extends out of the second Q route The output lead, the end of the output lead away from the second Q route and the end of the fifth Q route segment located in the second quadrant form a third bottom layer fracture; the end of the third Q route segment away from the first isolation lead extends out of the first A Q-way output lead, a fourth bottom layer fracture is formed between the end of the first Q-way output lead and the end of the second Q-way segment located in the second quadrant;

The fourth metal layer includes a first bottom layer jumper segment for connecting to the first bottom layer fracture, a second bottom layer jumper segment for connecting to the second bottom layer fracture, and for connecting the third bottom layer. A third bottom layer spanning line segment of the bottom layer fracture, and a fourth bottom layer spanning line segment for connecting the fourth bottom layer fracture.

The Doherty power amplifier based on a small quadrature signal generator according to the present invention has the advantages of using the top four layers of metal for layout, and rationally arranging the two transformers into the area of one transformer, reducing the area by half, and at the same time The coupling coefficient of the transformer is increased and the loss is reduced. The signal is transferred through magnetic coupling and the output phase is quadrature.

Description of drawings

Fig. 1 is the structural representation of the Doherty power amplifier of the present invention;

Fig. 2 is the structural perspective view of the quadrature signal generator of the present invention;

Fig. 3 is the structural front view of the quadrature signal generator of the present invention;

4 is a schematic structural diagram of the first metal layer of the quadrature signal generator according to the present invention;

5 is a schematic structural diagram of the second metal layer of the quadrature signal generator according to the present invention;

6 is a schematic structural diagram of the third metal layer of the quadrature signal generator according to the present invention;

7 is a schematic structural diagram of the fourth metal layer of the quadrature signal generator according to the present invention;

8 is an equivalent circuit diagram of the quadrature signal generator of the present invention;

Fig. 9 is the gain characteristic diagram of the quadrature signal generator of the present invention;

10 is a phase characteristic diagram of the quadrature signal generator of the present invention;

11 is a small-signal S-parameter simulation graph of the quadrature signal generator according to the present invention;

12 is a large-signal simulation graph of the quadrature signal generator of the present invention;

Fig. 13 is the output power backoff simulation curve diagram of the quadrature signal generator of the present invention;

Fig. 14 is the Monte Carlo simulation curve diagram 1 of the quadrature signal generator of the present invention;

Fig. 15 is the Monte Carlo simulation curve diagram 2 of the quadrature signal generator of the present invention;

FIG. 16 is the third Monte Carlo simulation curve diagram of the quadrature signal generator according to the present invention.

Reference number:

100-the first metal layer: 110-the first top layer spanning line segment, 120-the second top layer spanning line segment, 130-the third top layer spanning line segment, 140-the fourth top layer spanning line segment;

200-second metal layer: 210-first I route segment, 211-first I route output lead, 220-second I route segment, 230-third I route segment, 231-first input lead, 240-first I route segment Four I route sections, 241 - the second I route output lead, 250 - the fifth I route section, 260 - the sixth I route section, 261 - the second input lead;

300-Third metal layer: 310-First Q route segment, 311-First isolation lead, 320-Second Q route segment, 330-Third Q route segment, 331-First Q route output lead, 340-First Q route segment Four-Q line segment, 341-second isolation lead, 350-fifth Q-line segment, 360-sixth Q-line segment, 361-second Q-way output lead;

400 - the fourth metal layer: 410 - the first bottom layer spanning line segment, 420 - the second bottom layer spanning line segment, 430 - the third bottom layer spanning line segment, 140 - the fourth bottom layer spanning line segment;

IN- is the first input terminal, IN+ is the second input terminal, THU- is the first I-channel output terminal, THU+ is the second I-channel output terminal, CPL- is the first Q-channel output terminal, and CPL+ is the second Q-channel output terminal Output terminal, ISO- is the first isolation terminal, ISO+ is the second isolation terminal;

Cp is the parasitic capacitance, K is the coupling coefficient, and R is the isolation resistance.

Detailed ways

As shown in Figures 1-7, a Doherty power amplifier based on a small quadrature signal generator according to the present invention, the I channel differential signal of the quadrature signal generator is amplified by the main circuit and then enters the I channel of the output power combiner The Q channel differential signal is amplified by the auxiliary circuit and then enters the Q channel input. The output power combiner synthesizes the amplified I channel differential signal and the Q channel differential signal and outputs it to the outside.

The quadrature signal generator is composed of a first metal layer 100 , a second metal layer 200 , a third metal layer 300 and a fourth metal layer 400 stacked in sequence from top to bottom, wherein the first metal layer 100 and the second metal layer 100 The layer 200 is electrically connected, the second metal layer 200 is electrically connected to the third metal layer 300, and the third metal layer 300 is electrically connected to the fourth metal layer 400:

The second metal layer 200 forms an I-channel differential signal output circuit of a ring structure, and is provided with a fracture for the intersecting and interfering line segments in the same plane to pass through.

The third metal layer 300 forms a Q-channel differential signal output line of a ring structure, and is provided with a fracture for the intersecting and interfering line segments in the same plane to pass through.

The first metal layer 100 is provided with a plurality of spanning line segments for connecting two ends of each fracture of the second metal layer 200 in a one-to-one correspondence.

The fourth metal layer 400 is provided with a plurality of spanning line segments for connecting two ends of each fracture of the third metal layer 300 in a one-to-one correspondence.

The ring structure of the third metal layer 300 and the ring structure of the second metal layer 200 overlap in the vertical direction, and the cross-line segments of the first metal layer 100 and the cross-line segments of the fourth metal layer 400 are vertically overlapped.

The I-channel differential signal lines are partially overlapped in the middle of the quadrature signal generator.

The I-channel differential signal line is a 1.5-turn ring-shaped structure.

The second metal layer 200 includes a first I route segment 210 located in the outer circle of the first quadrant, a second I route segment 220 extending from the middle circle of the fourth quadrant to the inner circle of the second quadrant through the inner circle of the third quadrant, The third I route segment 230 extending from the middle circle of the first quadrant to the outer circle of the fourth quadrant, the fourth I route segment 240 extending from the outer circle of the second quadrant to the middle circle of the third quadrant, from the middle circle of the second quadrant through the A fifth I-route segment 250 in the inner quadrant extends to the fourth inner quadrant, and a sixth I-route segment 260 in the outer third quadrant. The end of the first I route segment 210 away from the first input lead 231 extends out of the first I route output lead 211 , the end away from the first I route output lead 211 and the end of the second I route segment 220 located in the fourth quadrant A first top layer fracture is formed between the parts. A second top layer fracture is formed between the end of the fifth I route segment 250 located in the fourth quadrant and the end of the fourth I route segment 240 located in the third quadrant, and the fourth I route segment 240 located at the end of the first quadrant extends out The second I-channel output lead 241 . The end of the sixth I route segment 260 away from the second I route output lead 241 extends out of the second input lead 261, and the end away from the second input lead 261 and the end of the fifth I route segment 250 located in the second quadrant A third top layer fracture is formed. The end of the third I route segment 230 away from the first I route output lead 211 extends out of the first input lead 231 , and between the end away from the first input lead 231 and the end of the second I route segment 220 located in the second quadrant A fourth top layer fracture is formed.

The first metal layer 100 includes a first top layer jumper 110 for connecting the first top layer fracture, and a second top layer jumper 120 for connecting the second top layer fracture, for connecting all the wires. The third top layer spanning line segment 130 of the third top layer fracture, and the fourth top layer spanning line segment 140 for connecting the fourth top layer break.

The third metal layer 300 includes a first Q route segment 310 located in the outer circle of the first quadrant, a second Q route segment 320 extending from the middle circle of the fourth quadrant to the inner circle of the second quadrant through the inner circle of the third quadrant, The third Q route segment 330 extending from the middle circle of the first quadrant to the outer circle of the fourth quadrant, the fourth Q route segment 340 extending from the outer circle of the second quadrant to the middle circle of the third quadrant, from the middle circle of the second quadrant through the An inner quadrant extends to a fifth Q-route segment 350 in the fourth quadrant inner circle, and a sixth Q-route segment 360 located in the third quadrant outer circle. The first isolation lead 311 extends from the end of the first Q route segment 310 away from the first Q route output lead 331 , and the end away from the first isolation lead 311 and the end of the second Q route segment 320 located in the fourth quadrant A first bottom layer fracture is formed between them. A second bottom layer fracture is formed between the end of the fifth Q-route segment 350 located in the fourth quadrant and the end of the fourth Q-route segment 340 located in the third quadrant, and the fourth Q-route segment 340 located at the end of the first quadrant extends out The second isolation lead 341 . The end of the sixth Q route segment 360 away from the second isolation lead 341 extends out of the second Q route output lead 361 , the end away from the second Q route output lead 361 and the end of the fifth Q route segment 350 located in the second quadrant A third bottom layer fracture is formed between them. The end of the third Q route segment 330 away from the first isolation lead 311 extends out of the first Q route output lead 331 , the end away from the first Q route output lead 331 and the end of the second Q route segment 320 located in the second quadrant A fourth bottom layer fracture is formed between them.

The fourth metal layer 400 includes a first bottom layer jumper segment 410 for connecting the first bottom layer fracture, and a second bottom layer jumper line 420 for connecting the second bottom layer fracture, for connecting all the wires. The third bottom layer spanning line segment 430 of the third bottom layer fracture, and the fourth bottom layer spanning line segment 440 for connecting the fourth bottom layer fracture.

The lumped model of the quadrature signal generator is shown in Fig. 8, wherein the second I output lead 241 is equivalent to THU+, the first I output lead 211 is equivalent to THU-, and the second input lead 261 is equivalent to IN+ , the first input lead 231 is equivalent to IN-, the second isolation lead 341 is equivalent to ISO+, the first isolation lead 311 is equivalent to ISO-, the second Q output lead 361 is equivalent to CPL+, and the first Q output Lead 331 is equivalent to CPL-. An equivalent parasitic capacitance Cp is formed between the second metal layer 200 , the third metal layer 300 and the ground. Two transformers with a coupling coefficient of K are formed between the second metal layer 200 and the third metal layer 300 , respectively corresponding to the differential Q-channel coupling. The differential input signal is transformed and coupled to the third metal layer 300 in the second metal layer 200 to realize the external output of the differential Q channel. On the other hand, the second metal layer 200 implements the differential output of the I-channel externally. The parasitic capacitance Cp of the metal trace and the actual transformer are used for resonance, so that the resonance can be achieved without adding additional capacitance, and the power loss is reduced. Aiming at the shortcomings of the large area and large loss of the quadrature signal generator in the traditional Doherty power amplifier structure, the present invention uses the method of combining the upper and lower magnetic coupling between the metals and the side magnetic coupling by making a reasonable layout of the IQ two-way transformer. , so that it only occupies the area of one transformer and realizes its miniaturization goal.

It can be seen in Figure 9 that the gain characteristic is only 0.6dB insertion loss at 28GHz, of which 3dB is the power separation. As can be seen in Figure 10, within 20GHz-40GHz, the phase quadrature characteristics are good, which is conducive to the realization of broadband applications. Therefore, the quadrature signal generator achieves good phase quadrature.

FIG. 11 is the small signal S-parameter simulation result of the Doherty power amplifier according to the present invention, which is displayed at about 28 GHz, the small signal gain S21 is 18.7 dB, and its 3 dB bandwidth is 26.02-29.05 GHz. Input matching S11 is -20.61dB at 28GHz. The isolation S12 is less than -84.31dB at 28GHz.

12 is the large signal simulation result of the Doherty power amplifier according to the present invention, the power gain is 22.1dB, the power gain jitter is 0.86dB, the saturated output power is 23.3dBm, and the output 1dB compression point is 22.92dBm.

Figure 13 is the simulation result of the large-signal output power backoff of the Doherty power amplifier according to the present invention, the peak power added efficiency is 37.38%, and the 6dB output power backoff efficiency is 24.5%. Compared with the ideal class B amplifier, the 6dB power backoff is The efficiency is increased by 1.54 times.

The effects of process angle variations and mismatches can be further verified through Monte Carlo simulations. The results of 100 simulations are shown in Figure 14-16, which shows the error distribution, which is in good agreement with the post-simulation results. It is proved that the quadrature signal generator of the present invention has the characteristics of small area and low loss, while the overall performance of the Doherty power amplifier remains unchanged.

For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims (4)

1. A Doherty power amplifier based on a small quadrature signal generator, the I-channel differential signal of the quadrature signal generator enters the I-channel input of the output power combiner after being amplified by the main circuit, and the Q-channel differential signal is amplified by the auxiliary circuit. After entering into the Q channel input, the output power combiner synthesizes the amplified I channel differential signal and the Q channel differential signal and outputs it externally; It is characterized in that, The quadrature signal generator is composed of a first metal layer (100), a second metal layer (200), a third metal layer (300) and a fourth metal layer (400) stacked in sequence from top to bottom, wherein the first metal layer (100) A metal layer (100) is electrically connected to the second metal layer (200), the second metal layer (200) is insulated and connected to the third metal layer (300), and the third metal layer (300) is connected to the fourth metal layer (400). ) electrical connection: The second metal layer (200) forms an I-channel differential signal output line of a ring structure, and is provided with a fracture for the intersecting and interfering line segments in the same plane to pass through; The third metal layer (300) forms a Q-channel differential signal output line of a ring structure, and is provided with a fracture for the intersecting and interfering line segments in the same plane to pass through; The first metal layer (100) is provided with a plurality of spanning line segments for connecting two ends of each fracture of the second metal layer (200) in a one-to-one correspondence; The fourth metal layer (400) is provided with a plurality of spanning line segments for connecting two ends of each fracture of the third metal layer (300) in a one-to-one correspondence; The annular structure of the third metal layer (300) and the annular structure of the second metal layer (200) overlap in the vertical direction, and each cross-line segment of the first metal layer (100) and the cross-line segment of the fourth metal layer (400) coincide in the vertical direction. 2 . The Doherty power amplifier based on a small quadrature signal generator according to claim 1 , wherein the I-channel differential signal lines form a partial overlap in the middle of the quadrature signal generator. 3 . 3 . The Doherty power amplifier based on a small quadrature signal generator according to claim 2 , wherein the I-channel differential signal line is a 1.5-turn ring-shaped structure. 4 . 4. The Doherty power amplifier based on a small quadrature signal generator according to claim 3, wherein the second metal layer (200) comprises a first I line segment ( 210), a second I route segment (220) extending from the middle circle of the fourth quadrant to the inner circle of the second quadrant through the inner circle of the third quadrant, and the third I route extending from the middle circle of the first quadrant to the outer circle of the fourth quadrant segment (230), a fourth I route segment (240) extending from the outer circle of the second quadrant to the middle circle of the third quadrant, and a fifth route segment (240) extending from the middle circle of the second quadrant to the inner circle of the fourth quadrant through the inner circle of the first quadrant I route segment (250), and a sixth I route segment (260) located in the outer circle of the third quadrant; wherein the end of the first I route segment (210) away from the first input lead (231) extends out of the first I route The output lead (211) forms a first top layer fracture between the end of the output lead (211) away from the first I route and the end of the second I route segment (220) located in the fourth quadrant; the fifth I route segment (250) ) between the end of the fourth quadrant and the end of the fourth I route segment (240) located in the third quadrant to form a second top layer fracture, and the end of the fourth I route segment (240) located in the first quadrant extends out of the first Two I-channel output leads (241); the end of the sixth I-route segment (260) away from the second I-channel output lead (241) extends out of the second input lead (261), away from the end of the second input lead (261) A third top layer fracture is formed between the end of the fifth I route segment (250) located in the second quadrant; the third I route segment (230) extends away from the end of the first I route output lead (211) out of the first an input lead (231), a fourth top layer fracture is formed between the end away from the first input lead (231) and the end of the second I route segment (220) located in the second quadrant; The first metal layer (100) includes a first top layer spanning line segment (110) for connecting to the first top layer fracture, and a second top layer spanning line segment (120) for connecting the second top layer crack , a third top-level spanning line segment (130) for connecting the third top-level fracture, and a fourth top-level spanning line segment (140) for connecting the fourth top-level fracture; The third metal layer (300) includes a first Q route segment (310) located in the outer circle of the first quadrant, and a second Q line segment (310) extending from the middle circle of the fourth quadrant to the inner circle of the second quadrant through the inner circle of the third quadrant A route segment (320), a third Q route segment (330) extending from the first quadrant middle circle to the fourth quadrant outer circle, and a fourth Q route segment (340) extending from the second quadrant outer circle to the third quadrant middle circle ), a fifth Q route segment (350) extending from the middle circle of the second quadrant to the inner circle of the fourth quadrant through the inner circle of the first quadrant, and a sixth Q route segment (360) located in the outer circle of the third quadrant; A first isolation lead (311) extends from the end of a Q route segment (310) away from the first Q route output lead (331), and the end away from the first isolation lead (311) and the second Q route segment (320) The first bottom layer fracture is formed between the ends of the fourth quadrant; the fifth Q route segment (350) is located between the end of the fourth quadrant and the fourth Q route segment (340) is located between the ends of the third quadrant to form the first fracture. The second bottom layer is fractured, and the end of the fourth Q route segment (340) located in the first quadrant extends out of the second isolation lead (341); the sixth Q route segment (360) extends away from the end of the second isolation lead (341) A third bottom layer fracture is formed between the end of the second Q output lead (361) away from the second Q output lead (361) and the end of the fifth Q line segment (350) located in the second quadrant; the third Q The end of the route segment (330) away from the first isolation lead (311) extends out of the first Q output lead (331), and the end away from the first Q output lead (331) and the second Q route segment (320) A fourth bottom layer fracture is formed between the ends of the second quadrant; The fourth metal layer (400) includes a first bottom layer spanning line segment (410) for connecting to the first bottom layer fracture, and a second bottom layer spanning line segment (420) for connecting the second bottom layer fracture , a third bottom layer spanning line segment (430) for connecting the third bottom layer fracture, and a fourth bottom layer spanning line segment (440) for connecting the fourth bottom layer fracture.

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