# Questions tagged [planar-inductor]

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### Why is my inductance and resonance frequency values of my Planar pcb simulation in COMSOL varying from the TI webench calculations?

I am designing a planar pcb inductive sensor. I designed a simple planar inductive coil having 10 turns with each turn having 0.1 mm width and 0.1 mm gap between them. The coil is pretty small just 10 ...
100 views

### Self-capacitance formula for planar inductors

I'm designing a Rectangular Planar Spiral inductor with a rectangular conductor cross-section (it's not made from cylindrical wire) for use in an RLC circuit (an NFC tag), and I can not optimise the ...
43 views

### Pancake coil AWG requirements for specific voltage and dimensions

I am creating a project and I am not an expert in electrical engineering, but I want to design a pancake coil with the maximal inductance to operate in 230V-50Hz and with dimensions of 60mm outer ...
• 103
481 views

### How to add and use "scripts" in Altium

Please go easy on me as I am new to Altium and not much of a software geek - actually have no idea what a script is. Anyway - question is - how do I add a script to Altium Designer, and how do I ...
• 479
8k views

### What is Negative Inductance?

I am experimenting with a stripline square spiral inductor in Sonnet and the graph is showing both a positive and negative inductance. What does it mean to have a negative inductance? Why does it ...
• 1,912
395 views

### Understanding the thermal images of planar pcb coils

Why is only the first turn in the coil hotter compared to other two turns? In this, only the turns of the top part seem to be hotter compared to the bottom. Current through the coils is 2 A. It is ...
• 15
1 vote
1k views

### How to design planar toroidal inductors using Altium designer?

Prior to this, I did spiral inductors which was relatively easy. But I am now stuck in designing toroidal inductors. I know the distance between each turns but having trouble placing them in ...
• 15
2k views

### LM2586 - Inductor Heats Then Burns

I'm designing a step-up constant current source to drive LED strips (nominal load voltage is about 54 VDC). Requirements: Vin: 18..32 VDC Iout = 0.2 A Vout = 54 VDC (nominal) - 57 VDC (maximum) ...
• 35.3k
1 vote
269 views

### Virtuoso Monte Carlo Inductor Problem

For an LNA design, the simulations for the inductors and the simulation for the rest of the components (transistors, capacitors, resistors etc.) are done in two different software packages. The ...
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8k views

### Making planar transformers in Altium

Does anyone know of a decent (repeatable) way of making planar transformers/planar inductors in Altium? And if so, how was the experience? Drawing out the tracks and checking trace/space clearance ...
• 3,759
4k views

### PCB coil designs

In researching how to design a planar rectangular PCB coil, I've come across numerous papers describing many topologies, except for a rectangular one. Square, hexagonal, circular are common ones, but ...
• 639
703 views

### Q-factor Inductor

The Q factor of an inductor is given by: Q=(2*pifL)/R Is this only the frequency dependent Rf? Or does it also include the series DC resistance?
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