Anisotropic Conductive Film Bonding for Flex Circuits When a flex circuit has to be joined to a rigid board, to a display, or to a glass panel, soldering is often impossible. The pitch is too fine, the substrate cannot take the temperature, or the connection has to be made over…

Load Cell Signal Conditioning and ADC Layout A load cell turns force into a very small differential voltage, typically a few millivolts at full scale, and the circuit that follows has to extract that signal from an environment full of motors, relays and switching supplies. Load cell signal conditioning is…

RF Impedance Matching: From Simulation To Measurement An RF link can look correct on paper and still disappoint on the bench. The parts are the ones the reference design used, the cables are assembled properly, and yet the gain is low, the noise is high or the waveform has developed…

Medical Impedance PCB: Tolerances, Materials And Testing Diagnostic equipment reads very small signals from a patient and turns them into an image or a waveform, and the board that carries those signals has to do it without adding distortion. That requirement drives a different set of specifications from an ordinary…

Declaration: Regulatory Requirements That Reach the PCB Every electronic product is subject to regulations that have nothing to do with whether it works, and the ones that reach the board are about materials, marking and energy. Knowing which apply early prevents a redesign at the point of certification. Restricted Substances…

Automated PCB Assembly: How a Full Line Works A fully automated pcb assembly line turns a set of design files and a bill of materials into tested boards with very little human intervention between the two. The steps are well established, but the way they interact decides yield, and understanding…

Solder Mask and Legend: Functional Not Cosmetic The mask and the legend are applied at the end of fabrication and they are the layers most often revised for cosmetic reasons, which is why they are also the layers where a change can quietly invalidate a qualification. Treating them as functional…

PCB HDMI Routing: High Speed in a Cable Buyers and engineers often focus on the finished product and forget the production line behind it. In practice, most field failures can be traced back to process decisions made during assembly. Understanding PCB HDMI routing gives you a practical advantage when you…

PCB DDR Routing Rules: Memory That Runs Fast Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB DDR routing rules from the perspective of a PCBA factory floor,…

PCB Fan Out of A BGA: Getting Out of the Grid Electronics manufacturing has become a discipline of small details. Solder paste volumes, placement accuracy, temperature profiles and inspection limits all add up to the final result. This guide looks at PCB fan out of a BGA from the perspective…