Lily's Column

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 ...

Impedance Matching in PCB Design

by Lily Zhang

Impedance Matching in PCB Design

Impedance Matching in PCB Design It is fair to consider a PCB itself as a component in which multiple traces are connected. Each trace is different...
Posted in Impedance, Impedance Control PCB, PCB design, PCB Impedance Matching

What is Reflow Soldering?

by Lily Zhang

What is Reflow Soldering?

Scheme of a reflow soldering process: Step 1 Solder paste printing:After mixing and acclimating the solder paste, it is manually/automatically app...
Posted in PCB, pcba, smt

What is Wave Soldering?

by Lily Zhang

What is Wave Soldering?

Wave soldering machines are mainly used for THT (Through-Hole Technology), components that (manually or fully automatically) are inserted through t...
Posted in pcba, smt, soldering

What is a HDI PCB ?

by Lily Zhang

What is a HDI PCB ?

HDI stands for High-Density Interconnector. Thus, HDI PCB is a special type of PCB that has the capability of high-density interconnections. In sim...
Posted in HDI PCB, PCB, PCB fabrication

How to Reverse Engineer a Schematic From a Circuit Board

by Lily Zhang

How to Reverse Engineer a Schematic From a Circuit Board

This project is a result of needing to service a domestic electronic item without being able to obtain a circuit diagram.The process proved to be v...
Posted in PCB, PCB design, PCB fabrication, reverse engineer, Reverse Engineering

What is a capped via hole?

by Lily Zhang

What is a capped via hole?

A capped via is when plating is added over the via hole so that the surface is fully metalized with a minimum copper / cap plating thickness of 5um...
Posted in PCB, PCB design, PCB fabrication, PCB layout, PCB manufacturing

Integrated Circuit Manufacturing Process

by Lily Zhang

Integrated Circuit Manufacturing Process

Wafer manufacturing and chip manufacturing are two steps to make integrated circuits. Wafer manufacturing includes two major steps, ingot manufactu...