Notifications
Clear all
Search result for: WA 0821 1305 0400 Order Material Geoteknik Geocomposite Murah Asmat Papua [[ADEFA]]
Page 2 / 2
Prev
| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Why do ceramic capacitors have no polarity? | 5 Relevance | 12 months ago | Divyam | Theoretical questions | |
| Ceramic capacitors use a ceramic dielectric (like barium titanate or similar Materials), which has symmetric electrical properties. Internally, they are made by stacking alternating layers of metal electrodes and ceramic dielectric Material. Since both electrodes are essentially the same and the dielectric doesn’t rely on an electrochemical process, the capacitor behaves the same regardless of the direction of current or applied voltage. That’s why they don’t require a positive or negative terminal, unlike electrolytic capacitors. Electrolytic capacitors, on the other hand, rely on an electrolytic solution and a thin oxide layer formed only on the positive plate during manufacturing. Reversing the polarity can damage this oxide layer, hence the need for correct polarity. | |||||
| Answer to: How do you design a PCB for high-frequency circuits? | 5 Relevance | 1 year ago | LogicLab | Theoretical questions | |
| You're absolutely right—when moving into high-frequency PCB design (in the MHz to GHz range), layout becomes critical for ensuring signal integrity and performance. At these frequencies, traces behave like transmission lines, so maintaining controlled impedance is essential. For most RF applications, a 50-ohm microstrip or stripline trace is standard, and you’ll need to calculate trace width based on your PCB stack-up, dielectric Material, and copper thickness. Trace layout should avoid right-angle bends, use 45° angles or curves, and keep high-speed traces as short and direct as possible. Differential signals (like USB or LVDS) require matched trace lengths and consistent spacing to maintain impedance and minimize skew. The PCB stack-up plays a huge role in high-frequency performance. It's best to place signal layers adjacent to solid ground planes to provide a continuous return path and minimize loop area, which helps reduce EMI. A 4-layer or higher board with dedicated power and ground planes is generally recommended. When choosing a stack-up, consult your PCB fabricator to ensure the dielectric thicknesses and Materials support your impedance requirements. Common mistakes in high-speed PCB design include failing to provide a solid ground reference under signal traces, using excessive or poorly placed vias that introduce unwanted inductance, and improperly terminating high-speed lines, which can result in reflections and ringing. Power integrity is also crucial—decoupling capacitors should be placed close to power pins, and using a mix of values helps cover a wider frequency range. Lastly, improper grounding between analog and digital sections can lead to noise coupling, so careful partitioning or single-point grounding is advised. With proper attention to these details and the use of simulation tools, designing high-frequency PCBs becomes much more manageable and repeatable. | |||||
Page 2 / 2
Prev
