Switching circuit for chip test carrier plate

Abstract

The invention relates to the technical field of switching circuits, in particular to a switching circuit for a chip test carrier plate, which comprises a first switch, a second switch, a third switch and a fourth switch, wherein the left end of the first switch is connected with the left end of the fourth switch, the right end of the first switch is connected with the right end of the third switch, the left end of the second switch is connected with the left end of the third switch, and the second switch is connected with the right end of the fourth switch. The problem that performance, flexibility, cost and installation of a traditional Switch circuit cannot be considered at the same time is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of switch circuit, in particular to a switch circuit for chip test carrier board. BACKGROUND

[0002] Printed circuit board (PCB) is an important part of physical support and signal transmission of electronic products; ATE board (chip test carrier board) is a kind of circuit board specially used for chip testing, which is characterized by complex design, high cost and high performance requirement.

[0003] Switch circuit allows multiple transmission paths of signals and is controlled; For example, one input corresponds to multiple outputs, or multiple inputs correspond to one output, or multiple inputs correspond to multiple outputs; Integrating switch circuit into a component is called switch component.

[0004] In chip testing, different test ports are often needed to test the functions of the same chip pin, so the chip pin needs to be switched to different test ports in a controllable way, so switch components are often used in chip test carrier boards.

[0005] Main problems of traditional switch: 1. In the chip testing environment, the service life of the switch component is limited, and the component is expensive, which will increase the testing cost; 2. The switch that can bear high frequency, high speed, high voltage and large current is expensive, and is a non-national product brand, the procurement cycle is unstable and uncontrollable; 3. The installation and maintenance of switch components require professional technical personnel to operate, which is difficult to operate.

[0006] Based on the above reasons, there is an urgent need for a circuit that can replace switch components in terms of performance, flexibility, cost and installation. SUMMARY

[0007] In order to overcome the problems in the prior art, the present application uses simple components to realize the function of multiple input and multiple output switch.

[0008] The technical scheme adopted by the present application is as follows: a switch circuit for chip test carrier board, comprising: a first switch, a second switch, a third switch and a fourth switch; wherein the left end of the first switch is connected with the left end of the fourth switch, the right end of the first switch is connected with the right end of the third switch, the left end of the second switch is connected with the left end of the third switch, and the right end of the second switch is connected with the right end of the fourth switch.

[0009] Further, the first switch, the second switch, the third switch and the fourth switch are 0Ω resistors.

[0010] Furthermore, the first switch, the second switch, the third switch, and the fourth switch are single-pole switches.

[0011] Furthermore, the first switch, the second switch, the third switch, and the fourth switch are wires.

[0012] Furthermore, the first switch, the second switch, the third switch, and the fourth switch are jumpers.

[0013] Furthermore, the first switch, the second switch, the third switch, and the fourth switch can be any two combinations of a 0Ω resistor, a single-pole switch, a wire, and a jumper.

[0014] Furthermore, the first switch, second switch, third switch, and fourth switch can be any combination of three of the following: 0Ω resistor, single-pole switch, wire, and jumper.

[0015] Furthermore, the first, second, third, and fourth switches are combinations of four types: 0Ω resistor, single-pole switch, wire, and jumper.

[0016] The beneficial effects of this invention are: 1. This invention uses a new structure and a 0Ω resistor to build a four-switch combination circuit. As an alternative to traditional switch devices, it is easy to procure, low in cost, highly flexible, meets performance standards, and is easy to install and maintain. Attached Figure Description

[0017] Figure 1 This is a logic block diagram of the switching circuit of the present invention; Figure 2 This is a schematic diagram of the resistor switch circuit of the present invention; Figure 3 It is a traditional switch circuit; Figure 4 This is a schematic diagram of the working path of the resistor switch circuit of the present invention. Figure 1 ; Figure 5 This is a schematic diagram of the working path of the resistor switch circuit of the present invention. Figure 1 Detailed explanation. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. The drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] like Figure 3Traditional switch devices, taking a common 2-input 4-output switch element as an example, have pins 1 and 8 as control terminals, and pins 2, 3, and 4 forming a switch circuit. Pin 3 is the input, and pins 2 and 4 are both outputs. By controlling the control terminals, pins 3 and 2 can be turned on, or pins 3 and 4 can be turned on. Similarly, pins 6, 7, and 8 form another switch circuit. These circuits are integrated into a single switch element. Traditional switch devices have fixed functions; pin 3 can only connect to pins 2 or 4, and pin 6 can only connect to pins 5 or 7, resulting in poor flexibility.

[0020] Taking the JQX-17 switch as an example, its switch part is a mechanical switch, which is a spring plate device to switch the circuit, but it will fail after a certain number of uses; the switch is relatively expensive, involving cross-border procurement, and the order cycle will fluctuate; the switch has 8 pins, and soldering and disassembly replacement require certain skills.

[0021] like Figure 1 A switching circuit for a chip test carrier board, comprising: A circuit with switch functionality is built using four 0Ω resistors to replace the traditional switch device; the principle is as follows: Figure 2 As shown, the circuit board design is as follows: Figure 4 As shown; A 0Ω resistor is equivalent to a wire. Since its resistance is 0, it does not affect the performance of the original circuit. It is also easy to solder and disassemble, and is relatively stable after soldering. Other alternatives can be used, such as soldering a wire, or using a wire adjuster or a miniature single-pole switch; although other methods are simple, they are not as stable as 0Ω resistance soldering. If there are a large number of them, 0Ω resistors can be installed in batches using a pick-and-place machine; however, wires and jumpers cannot be installed in batches. In addition, 0Ω resistors are small in size and are surface-mount packaged; while wire and jumper mounting requires additional vias to be designed on the board.

[0022] Of course, they can also be used in combination according to needs, such as using a 0Ω resistor and wires together.

[0023] Working principle: A and B are signal input or output ports, and C and D are output or input ports. The input and output functions can be switched; that is, any two ports can be used as inputs and the other two ports as outputs; for example: A and B are inputs and C and D are outputs; or A and D are inputs and B and C are outputs.

[0024] It can also be implemented so that any port is the input and the rest are the outputs; for example: A is the input and B, C, and D are the outputs; or B is the input and A, C, and D are the outputs.

[0025] It can also be implemented with three ports as inputs and one port as output; for example: A, B, and C as inputs and D as output; or A, B, and D as inputs and C as output.

[0026] It can also be implemented with two ports as inputs and one port as output; for example: A and B are inputs and D is output; or A and C are inputs and D is output.

[0027] It can also be implemented that one port is an input and the other ports are outputs; for example: A is the input and B is the output; or A is the input and D is the output.

[0028] This means that any one or more ports can be used as inputs, and any one or more of the remaining ports can be used as outputs. We will not enumerate them further here.

[0029] like Figure 4 R1 to R4 serve as bridges for line switching; the green lines represent the wires already designed on the circuit board; multiple conduction path switching modes can be achieved by selectively installing four resistors. Taking A and B as signal input ports and C and D as output ports as an example: If R3 and R4 are installed, and R1 and R2 are not installed, then R3 and R4 are in a conductive state, and R1 and R2 are in an open circuit state. Therefore, port A is only connected to port D, and port B is only connected to port C. Figure 5 As shown.

[0030] If R1 and R2 are installed, but R3 and R4 are not installed, then R1 and R2 are in a conductive state, and R3 and R4 are in an open state. Therefore, port A is only connected to port C, and port B is only connected to port D.

[0031] Table 1. Component Installation and Circuit Correspondence:

[0032] As shown in Table 1, assuming A and B are the starting points and C and D are the ending points, the installation of R2 and R3 affects the path from A to C or D; therefore, the combination of R1, R2, R3, and R4 will have various conduction effects between A and B and C and D.

[0033] This invention uses a novel structure and a 0Ω resistor to build a switch circuit. As an alternative to switch devices, it features easy procurement, low cost, high flexibility, satisfactory performance, and simple installation and maintenance.

[0034] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A switching circuit for a chip test board, characterized by, Comprise: The first switch, the second switch, the third switch and the fourth switch; wherein the left end of the first switch is connected with the left end of the fourth switch, the right end of the first switch is connected with the right end of the third switch, the left end of the second switch is connected with the left end of the third switch, and the right end of the second switch is connected with the right end of the fourth switch.

2. The switching circuit for a chip test board according to claim 1, wherein: The first switch, the second switch, the third switch and the fourth switch are 0Ω resistance.

3. The switching circuit for a chip test board according to claim 1, wherein: The first switch, the second switch, the third switch and the fourth switch are single-blade switches.

4. The switching circuit for a chip test board according to claim 1, wherein: The first switch, the second switch, the third switch and the fourth switch are wires.

5. The switching circuit for a chip test board according to claim 1, wherein: The first switch, the second switch, the third switch and the fourth switch are jumpers.

6. The switching circuit for the chip test board according to any one of claims 2, 3, 4, 5, wherein: The first switch, the second switch, the third switch and the fourth switch are any two combinations of 0Ω resistance, single-blade switch, wire and jumper.

7. The switching circuit for the chip test board according to any one of claims 2, 3, 4, 5, wherein: The first switch, the second switch, the third switch and the fourth switch are any three combinations of 0Ω resistance, single-blade switch, wire and jumper.

8. The switching circuit for the chip test board according to any one of claims 2, 3, 4, 5, wherein: The first switch, the second switch, the third switch and the fourth switch are four combinations of 0Ω resistance, single-blade switch, wire and jumper.

Images