CN114297978A - Four-channel front-end self-checking integrated circuit design method - Google Patents

Abstract

The invention discloses a design method of a four-channel front-end self-checking integrated circuit, which compresses a front-end circuit and a self-checking power dividing circuit into one circuit, wherein the working frequency band covers DC-2 GHz, microwave circuits are designed on the front and back sides of the circuit, microwave packaging devices are welded on the two sides of the circuit through SMT, the microwave circuits are designed on the front side, the self-checking power dividing circuit is designed on the back side, microwave cables between a self-checking power dividing circuit box body and the front-end channel are reduced, the assembly steps of the system are simplified, the assembly speed of the whole module is accelerated, and the size of the whole circuit is 55.6 multiplied by 10 multiplied by 1mm³The cost of the whole system is reduced, and the occupied area of the whole system is effectively reduced.

Description

Four-channel front-end self-test integrated circuit design method

technical field

The invention belongs to microwave communication technology, in particular to a design method of a four-channel front-end self-checking integrated circuit.

Background technique

In recent years, military and aerospace electronic equipment has been developing towards "light, thin and short", and the demand for high density, high function and high speed of its circuit components is becoming more and more urgent. As a part of the front-end of a certain detection equipment, the integrated design method of the four-channel front-end self-checking integrated circuit is of great significance.

At present, for the detection system, multiple channels are integrated into one circuit, the microwave channel circuit is designed on the front, and the self-checking power division circuit is designed on the reverse. The hole realizes the interconnection of the self-test source signal and the microwave signal. The four-channel front-end self-checking integrated circuit design method and other functional circuits are designed in the same box. The front-end channel box and the self-checking signal power division network box are connected by four microwave cables. Since two boxes are used to design the front-end channel and the power division network respectively, the entire system occupies a large area, and the two boxes are connected by cables, so a separate microwave cable needs to be made, which will increase the assembly time of the entire system. and assembly costs.

When the self-test power division circuit and the front-end channel are designed on the same side of the box, on the one hand, the overall area of the module will be increased, and on the other hand, the self-test signal will cross the microwave link. In order to avoid the crossover between the self-test signal and the microwave link, multi-layer board technology will be used, which will increase the cost of the circuit, increase the probability of errors in the circuit, and improve the reliability of the design.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a four-channel front-end self-checking integrated circuit design method, which compresses the front-end circuit and the self-checking power division circuit into one circuit, and reduces the microwave cable between the self-checking power division circuit box and the front-end channel. , which simplifies the assembly steps of the system and speeds up the assembly speed of the entire module. The size of the entire circuit is 55.6×10×1mm ³ , which reduces the cost of the entire system and effectively reduces the area occupied by the entire system.

The technical solution for realizing the present invention is: a four-channel front-end self-checking integrated circuit design method, which is characterized in that: the working frequency range covers DC to 2 GHz, microwave circuits are designed on both sides, and microwave packaging devices are welded by SMT on both sides of the circuit, The microwave circuit is designed on the front, and the self-checking power division circuit is designed on the reverse.

Further, based on the HFSS simulation, without reducing the performance, the interconnection between the self-test source signal and the microwave signal is realized by using vias on the printed board. The front side is designed with 4 microwave paths and 4 self-test paths, and the reverse side is designed Self-checking power division circuit, the self-checking signal is divided into four power circuits through the reverse circuit, and transmitted to the front circuit through the via hole.

Further, the printed board is designed as a four-layer board. The middle layer of the printed board is covered with copper, and the edge is metallized to increase the microwave grounding area. The metallized through holes are added to make the grounding between the circuits of each layer good; the contact with the structural parts through the metallized through holes increases the grounding area.

Further, the front side of the circuit board is placed on the hollow structural member, and the screws are installed from the reverse side, so that the circuit is fastened on the structural member, and the side wall of the circuit is closely attached to the structural member, which increases the grounding of the circuit and prevents the microwave signal from the reverse side from disturbing the front side. Circuit; there is a metal partition wall between the reverse circuit and the digital circuit to reduce the crosstalk to the microwave circuit from the outside world; at the same time, there are also metal partition walls between the four channels on the front to prevent the mutual crosstalk between the channels. Leave a certain space, increase the width of the metal partition wall, and add metal through holes in the corresponding position of the metal partition wall, so that the front circuit has a good grounding.

Further, the self-test signal enters the power division of the self-test power division circuit, and the self-test signal after power division is connected back to the front circuit through the via hole and supplied to each front-end circuit for use.

Compared with the prior art, the present invention has the following significant advantages:

(1) The circuit realizes the design of microwave circuits on both sides of the front and back, which effectively utilizes the area of the printed board and greatly increases the integration.

(2) The present invention integrates the self-checking power division module and the front-end module, reduces the interconnecting cables between the modules, reduces the module volume required to realize the function, and reduces the production cost of the components.

(3) The circuit is assembled with SMT surface mount devices, and then fixed on the structural parts with screws, which reduces the difficulty of assembly, shortens the assembly time of components, and reduces the production cost of components.

(4) The self-checking signal inside the module adopts the front and back interconnection, which effectively reduces the assembly difficulty and improves the reliability of the signal interconnection.

Description of drawings

Figure 1 is the structure diagram of the four-channel front-end self-checking integrated circuit.

Figure 2 is a block diagram of the self-checking power division principle.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a 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 those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relationship between various components under a certain posture (as shown in the accompanying drawings). The relative positional relationship, motion situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In the present invention, unless otherwise expressly specified and limited, the terms "connection", "fixed" and the like should be understood in a broad sense, for example, "fixed" can be a fixed connection, a detachable connection, or an integrated; " A connection" can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions It does not exist, nor does it fall within the protection scope claimed by the present invention.

The specific implementation, as well as the technical difficulties and inventive points of the present invention will be further introduced below in conjunction with this design example.

The invention is mainly aimed at in-depth research on the design method of a four-channel front-end self-checking integrated circuit of a ground electronic investigation equipment. By designing the microwave circuit on both sides, integrating the multi-channel front-end circuit on the front, and designing the self-checking circuit on the reverse side, the electronic The size of the reconnaissance, the integration of the system is realized, the volume and weight have obvious advantages compared with the integration of parts and components, and it meets the actual engineering needs. The implementation of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Referring to Figure 1, the four-channel front-end self-checking integrated circuit design method of the present invention requires that the circuit operating frequency range covers DC to 2GHz, microwave circuits are designed on both front and back sides, microwave packaging devices are welded by SMT on both sides of the circuit, and the front side is designed with multi-channel The front-end circuit is designed with a self-checking power division circuit on the reverse side to improve integration and reduce the size of the circuit.

Based on HFSS simulation, the interconnection between the self-check source signal and the front-end signal is realized by using vias on the printed board without reducing the performance. The front side is designed with 4 front-end paths and 4-way self-check paths, and the back side is designed with the self-check function. Divide the circuit, the self-test signal is divided into four channels through the reverse circuit, and transmitted to the front circuit through the via hole.

The printed board is designed as a four-layer board. The middle layer of the printed board is covered with copper, and the edge is metallized to increase the microwave grounding area. At the same time, according to the device arrangement, the front of the printed board is placed on the hollow structural member, and the circuit board is increased by metallization. Through holes, the grounding between the circuits of each layer is good; through the metallized through holes and the structural parts, the grounding area is increased.

The front side of the circuit board is placed on the hollow structural member, and the screws are installed from the reverse side, so that the circuit is fastened on the structural member, and the side wall of the circuit is closely attached to the structural member, which increases the grounding of the circuit and prevents the reverse microwave signal from crosstalking the front circuit. There is a metal partition wall between the circuit and the digital circuit to reduce the crosstalk to the microwave circuit from the outside world; at the same time, there are also metal partition walls between the four channels on the front to prevent the mutual crosstalk between the channels, and a certain space is reserved between the channels. , Increase the width of the metal partition wall, and increase the metal through hole in the corresponding position of the metal partition wall, so that the front circuit has a good grounding.

The self-test signal enters the power division of the self-test power division circuit, and the self-test signal after power division is connected to the front circuit through the via hole and supplied to each front-end circuit for use. Compared with traditional circuits, multi-channel front-end circuit self-checking requires multiple separate self-checking modules, saving a power division four-way component and a cable connected to a separate self-checking module, effectively reducing the area occupied by the front-end circuit. Under the condition that the whole circuit realizes the same function, the volume occupied by the whole system is effectively reduced. The size of the four-channel front-end self-test IC is 55.6×10×1mm ³ .

The circuits that traditionally use two functions are integrated into one printed board, which simplifies the assembly steps and greatly shortens the production cost and processing cycle.

Example 1

FIG. 1 is a circuit structure diagram of a design method for a four-channel front-end self-test integrated circuit according to an embodiment of the present invention. The circuit includes four front-end circuits and one self-test power division circuit.

Combined with Figure 1, both sides of the circuit are welded by SMT microwave package devices. The front side is designed with a multi-channel front-end circuit, and the reverse side is designed with a self-checking power division circuit. The two sides are interconnected through vias, which simplifies the assembly process and shortens the assembly time compared to using cables or insulators , while saving a certain cost; the circuit is copper-coated on the middle layer of the printed board, metallized and wrapped, and the way of adding vias increases the ground plane of the printed board and the box, improving the performance of the circuit; each front end The partition wall is added between the circuits to improve the isolation between the channels; meanwhile, the size of the entire circuit is 55.6×10×1 mm ³ , which reduces the volume by more than 50% compared with the traditional design method.

Claims (6)

1. a four-channel front-end self-checking integrated circuit design method, is characterized in that: the working frequency band covers DC～2GHz, the front and back sides are all designed with microwave circuits, both sides of the circuit are welded microwave packaging devices by SMT, the front side is designed with microwave circuits, and the back side is designed Self-checking power division circuit. 2. The four-channel front-end self-checking integrated circuit design method according to claim 1, characterized in that: based on HFSS simulation, the self-checking source signal and the For the interconnection of microwave signals, 4 microwave paths and 4 self-checking paths are designed on the front, and a self-checking power division circuit is designed on the reverse side. 3. according to the four-channel front-end self-checking integrated circuit design method of claim 2, it is characterized in that: the printed board is designed as a four-layer board, the middle layer of the printed board is copper-coated, metallized and wrapped, and the microwave grounding area is increased; Arrangement, the front of the printed board is placed on the hollow structural member, and the metallized through hole is added to the circuit board to make the grounding between each layer of circuits good; the metallized through hole is in contact with the structural member to increase the grounding area. 4. The four-channel front-end self-checking integrated circuit design method according to claim 3, wherein the front side of the circuit board is placed on the hollow structural member, and the screws are installed from the reverse side, so that the circuit is fastened on the structural member, and the circuit edge The wall is closely attached to the structural member, which increases the grounding of the circuit and prevents the reverse microwave signal from crosstalking the front circuit; the reverse circuit and the digital circuit are separated by a metal partition to reduce the crosstalk to the microwave circuit from the outside world; at the same time, between the four channels on the front There are also metal partition walls to prevent mutual crosstalk between channels. A certain space is reserved between channels to increase the width of the metal partition walls. Metal through holes are added to the corresponding positions of the metal partition walls, so that the front circuit has a good grounding. 5. The four-channel front-end self-checking integrated circuit design method according to claim 4, wherein the self-checking signal enters the self-checking power division circuit for power division, and the self-checking signal after the power division is connected back to the front side through the via hole The circuit is used for each front-end circuit. 6 . The four-channel front-end self-checking integrated circuit design method according to claim 1 , wherein the size of the entire circuit is 55.6×10×1 mm ³ .

Images