PCB Manufacturer & PCB Assembly

What are the ways to increase the impedance?

Posted on November 05, 2018 by G

When the impedances don't match, what are the ways to match it? First, consider using a transformer for impedance conversion, as in the example in the TV above. Second, consider using series/parallel capacitors. Or inductive methods, which are often used when debugging RF circuits. Third, consider the use of series/parallel resistors. Some drivers have lower impedance and can be connected in series with a suitable resistor to match the transmission line, such as high-speed signal lines, sometimes A series of resistors of several tens of ohms will be connected in series. The input impedance of some receivers is relatively high. The method of parallel resistors can be used to match the transmission line. For example, 485 bus receivers often have a matching resistor of 120 ohms in parallel at the data line terminal.

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Understanding of input impedance and output impedance

Posted on November 05, 2018 by G

The so-called input impedance mainly considers the power consumed by the circuit itself (can be understood as meaningless loss). For a voltage-driven circuit, the larger the impedance, the smaller the current, the smaller the P=I*I*R, and the smaller the current. In terms of the driving circuit, the smaller the impedance, the smaller the P=I*I*R, and the smaller the power consumption, so that for the latter circuit, more power can be output.

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Some basic concepts of signal integrity in high speed circuit design

Posted on November 05, 2018 by G

1. Signal Integrity: refers to the quality of the signal in the circuit system. If the signal can be transmitted from the source to the receiver without distortion in the required time, we call the signal complete.

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How to quickly solve the signal integrity problem of high speed systems

Posted on November 05, 2018 by G

As data rates continue to increase, signal integrity issues have become the most critical factor for design engineers to consider. This exponential increase in data rate can be seen in applications such as handheld mobile devices and consumer display products to high-bandwidth routers/switches. Jitter (noise) is the primary reason for reducing the level of signal integrity in a design. In addition to signal integrity enhancement techniques using layout, impedance matching, and more expensive materials, designers can simply add jitter cancellers such as equalizers to the design to solve jitter problems. This way designers don't have to focus on signal integrity issues, but focus on the core design of the system.

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Singnal Integrity terminology (12-22)

Posted on October 31, 2018 by G

12. What is the pin-to-pin delay (delay)?

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Singnal Integrity terminology (1-11)

Posted on October 31, 2018 by G

1. What is Signal Integrity?

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Two major problems in high speed PCB design

Posted on October 30, 2018 by G

1. EMC, EMI. 2. Routing skills for high-speed differential signals

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Serial RapidIO Switching Design Practice Tips for Handling Signal Integrity

Posted on October 30, 2018 by G

Signal integrity (SI) issues are becoming a growing concern for digital hardware designers. Due to the increased data rate bandwidth in wireless base stations, wireless network controllers, wired network infrastructure, and military avionics systems, board design has become increasingly complex.

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Handling Signal Integrity of High-Speed Board Designs with Serial RapidIO Switching

Posted on October 30, 2018 by G

This article focuses on signal integrity challenges involving high-speed interface design (the main features of RapidIO switching support these high-speed interface designs), and the ability to optimize RapidIO switching is designed to achieve high signal integrity in high-speed designs.

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Have to know the PCB design skills

Posted on October 26, 2018 by G

The advantage of Protel is that it is more popular in the Chinese market. As long as the PCB is Protel, any file can make a board. Southern China is more likely to accept the OrCAD format.

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Ground interference analysis and suppression method in PCB layout

Posted on October 24, 2018 by G

The main cause of electromagnetic interference caused by the ground line is the impedance of the ground line. When the current flows through the ground line, a voltage is generated on the ground line. This is the ground line noise. Driven by this voltage, ground loop current is generated, causing ground loop interference. When two circuits share a ground line, a common impedance coupling is formed. The method for solving the ground loop interference is to cut the ground loop, increase the impedance of the ground loop, and use a balanced circuit. The solution to the common impedance coupling is to reduce the impedance of the common ground portion or to use a parallel single-point grounding to completely eliminate the common impedance.

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Method of avoiding transmission line effects

Posted on October 24, 2018 by G

The ways to control the effects of transmission line effects from the following aspects.

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High-speed PCB controllability and electromagnetic compatibility design

Posted on October 24, 2018 by G

When the system is operating at 50MHz, transmission line effects and signal integrity issues will occur; when the system clock reaches 120MHz, PCBs based on traditional methods will not work unless high speed circuit design knowledge is used. Therefore, high-speed circuit design technology has become a design tool that electronic system designers must adopt. The controllability of the design process can only be achieved by using the design techniques of high-speed circuit designers.

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Talking about impedance control of PCB

Posted on October 18, 2018 by G

As circuit design becomes more complex and high-speed, how to ensure the integrity of various signals (especially high-speed signals), that is, to ensure signal quality, becomes a problem. At this time, it is necessary to analyze by means of the transmission line theory, and the characteristic impedance matching of the control signal line becomes the key. The non-strict impedance control will cause considerable signal reflection and signal distortion, resulting in design failure. Common signals, such as PCI bus, PCI-E bus, USB, Ethernet, DDR memory, LVDS signals, etc., require impedance control. Impedance control ultimately needs to be realized through PCB design, and higher requirements are also imposed on the PCB board process.

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Analysis of problems in PCB design (26-40)

Posted on October 18, 2018 by G

26. When there are multiple digital/analog function blocks in a PCB board, the conventional practice is to separate the digital/analog grounds. What are the reasons?

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Tag: pcb problems pcb PCB design

Analysis of problems in PCB design (16-25)

Posted on October 18, 2018 by G

Can you introduce some foreign technical books and materials on high-speed PCB design?

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Tag: high-speed digital circuits PCB design

Analysis of problems in PCB design (1-15)

Posted on October 18, 2018 by G

1. How to choose PCB board?

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Module function circuit PCB board design

Posted on October 08, 2018 by G

Each VXI bus device has a set of “configuration registers”. The system main controller reads some of the basic configuration information of the VXI bus device by reading the contents of these registers, such as device type, model, manufacturer, and address space (A16, A24). , A32) and the required storage space.

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Test technology Based on high speed PCB interconnect design

Posted on October 08, 2018 by G

PCB interconnect design techniques include testing, simulation, and various related standards, where testing is the method and means to verify the results of various simulation analyses. Excellent test methods and means are necessary to ensure the analysis of PCB interconnection design. For traditional signal waveform testing, the main focus should be on the length of the probe leads to avoid unnecessary noise introduced by Pigtail. This article focuses on new applications and development of interconnect testing techniques.

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PCB interconnection design skills and methods

Posted on September 26, 2018 by G

The interconnection of the board system includes: chip-to-board, interconnection within the PCB, and three types of interconnections between the PCB and external devices. In the RF design, one of the main problems facing the electromagnetic characteristics engineering design at the interconnection point, this paper introduces the various techniques of the above three types of interconnection design, including the device installation method, wiring isolation and measures to reduce lead inductance.

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What are the ways to increase the impedance?

Understanding of input impedance and output impedance

Some basic concepts of signal integrity in high speed circuit design

How to quickly solve the signal integrity problem of high speed systems

Singnal Integrity terminology (12-22)

Singnal Integrity terminology (1-11)

Two major problems in high speed PCB design

Serial RapidIO Switching Design Practice Tips for Handling Signal Integrity

Handling Signal Integrity of High-Speed Board Designs with Serial RapidIO Switching

Have to know the PCB design skills

Ground interference analysis and suppression method in PCB layout

Method of avoiding transmission line effects

High-speed PCB controllability and electromagnetic compatibility design

Talking about impedance control of PCB

Analysis of problems in PCB design (26-40)

Analysis of problems in PCB design (16-25)

Analysis of problems in PCB design (1-15)

Module function circuit PCB board design

Test technology Based on high speed PCB interconnect design

PCB interconnection design skills and methods

Categories

Recommended Article:

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What are the ways to increase the impedance?

Understanding of input impedance and output impedance

Some basic concepts of signal integrity in high speed circuit design

How to quickly solve the signal integrity problem of high speed systems

Singnal Integrity terminology (12-22)

Singnal Integrity terminology (1-11)

Two major problems in high speed PCB design

Serial RapidIO Switching Design Practice Tips for Handling Signal Integrity

Handling Signal Integrity of High-Speed ​​Board Designs with Serial RapidIO Switching

Have to know the PCB design skills

Ground interference analysis and suppression method in PCB layout

Method of avoiding transmission line effects

High-speed PCB controllability and electromagnetic compatibility design

Talking about impedance control of PCB

Analysis of problems in PCB design (26-40)

Analysis of problems in PCB design (16-25)

Analysis of problems in PCB design (1-15)

Module function circuit PCB board design

Test technology Based on high speed PCB interconnect design

PCB interconnection design skills and methods

Categories

Recommended Article:

Handling Signal Integrity of High-Speed Board Designs with Serial RapidIO Switching