Lily's Column

Active Crystal Oscillator VS Passive Crystal Oscillator

by Lily Zhang

Active Crystal Oscillator VS Passive Crystal Oscillator

Crystal oscillators are usually divided into passive crystal oscillators and active crystal oscillators. Passive crystal oscillators are generally ...

Difference between VCC, VEE, VDD, and VSS

by Lily Zhang

Difference between VCC, VEE, VDD, and VSS

The meanings and differences of VCC, VEE, VDD, and VSS used in the supply voltage are shown below. VCC VCC is used as the positive supply voltag...

How to Hand Solder an LCD FPC/FFC Connector?

by Lily Zhang

How to Hand Solder an LCD FPC/FFC Connector?

Let’s face it, full-colour TFT displays are cool and adding one to your project is going to instantly endow your project with coolness. The problem...

Why the AMOLED has different display effect?

by Lily Zhang

Why the AMOLED has different display effect?

The P array of AMOLED: the struggle between display effects and lifespan. When it comes to the downsides of AMOLED, the first thing that comes to m...

What are the main differences between LCD and OLED?

by Lily Zhang

What are the main differences between LCD and OLED?

Here, we will not specifically introduce the technical principle of LCD and OLED. You just need to remember that LCD (Liquid Crystal Display) is ac...

DDR 3 PCB

by Lily Zhang

DDR 3 PCB

The DDR 3 PCB is a third generation memory chip of the synchronous dynamic RAM PCB. The DDR 3 PCB offers you superior performance advantages over i...

DFM and DFA

by Lily Zhang

DFM and DFA

DFM and DFA The two concepts that summarize the above requirements are DFM and DFA. DFM, acronym for Design for Manufacturing, ensures that the PCB...

How to Use the Multimeter

by Lily Zhang

How to Use the Multimeter

A multimeter is a portable instrument that measures electrical quantities like voltage, current, and resistance. It is also known as a multitester,...

6 Layers impedance design

by Lily Zhang

6 Layers impedance design

The impedance design of the outer trace is the same as that of the 4 layers board. The inner trace is generally more plane layer than the surface t...

4 Layers impedance design

by Lily Zhang

4 Layers impedance design

100 ohm differential impedance recommended design line width, spacing 5/7/5mil differential pair and the distance between the pair ≥ 14mil (3W crit...

2 Layers Impedance Design

by Lily Zhang

2 Layers Impedance Design

100 ohm differential impedance recommended design Ground package design: line width/spacing 7/5/7mil ground wire width ≥20mil signal and ground wi...
Posted in Impedance, Impedance Control PCB, PCB design, PCB Impedance Matching

What affect PCB impedance and how to calculate impedance

by Lily Zhang

What affect PCB impedance and how to calculate impedance

The impedance of the circuit board is determined by the physical dimensions (line wide/space) and materials of the circuit and is measured in Ohms ...