Wideband coupling - Transformer Impedance matching (1/3)

#149 In this video I start looking at a form of impedance matching that has both a wide-band performance and is lossless, so it combines the best of resistive matching and LC network matching. Of course this method isn't ideal but once you understand the limitations it can be very useful.

Related topics:

Further reading and documentation:

Special Thanks to all my supporters on Patreon! Especially @afiskon, Ralf B., Paul Pr. Richard and Jonathan Alvarado!

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[mikemercury]

Excellent presentation: well prepared and thought out and straight to the point; If only there were more channels like this.

[terrygains]

This is a brilliant channel. The host's mastery of LT Spice makes complicated circuit theory so easy to understand. Thank you for all of your efforts.

[ahbushnell]

The leakage inductance is very important at the high end. There can be resonances between the capacitance and leakage inductance and resonance between the magnetizing inductance and capacitance.

Excellent video.

[alaricsnellpym]

Loving the detailed coverage of the practical consequences of non-ideal components and how they drive component selection!

[pfabri]

Really comprehensive! I was especially thrilled that you touched on the topic of ethernet isolation transformers and digital signals. Thank you for yet another great and informative video!

[MXYM]

This is an excellent channel - it really is. Very clearly explained. I'm hoping Professor FesZ takes us through the building of a radio receiver/transmitter together with the theory and practice - from antenna to audio!

[susceptibility_]

Telepathy works, because I was looking for transformer knowledge, and you have just made a video about it :D

[pbaemedan]

FesZ, great video. Thank you for all the hard work. LTspice is a great tool for the normal electrical engineer. Your willingness to provide examples lets one to do the what if sincero.

[hedleyfurio]

You have excellent signal to noise ratio - hopefully lt spice will sponsor your channel as you clearly show it’s value over a range of applications 👍

[therfnoob]

just found this channel! Great work! thanks

[Mike-H_UK]

Very interesting - many thanks. One addition complication that I found: you mention using 'magnetic cores' in order to maximise the 'L' for a better low frequency cutoff, yet reducing the 'C' for a better high frequency cutoff. This is 100% true, but practical cores have the disadvantages of increasing the 'core loss resistor' and this increases thermal noise - sometimes unacceptably, and also the real part of the complex permeability drops off for higher frequencies and this can in turn limit the high frequency response. Thanks again for a very educational video - you obviously spend a lot of time on these.

[rjordans]

Another nice one! Maybe one you have covered filter design you can have a look at bandpass filters with impedance conversion. Also a nice way of getting higher bandwidth matching. There are some nice tables around that give you the component values for different ratios of input and output impedance.

[RCH]

Very nicely explained! It is worth noting that it works for low frequency applications. Cannot be applied for RF signals.

[nomadr]

This channel is almost as good as w2aew!

[adam]

Impedance matching is a wizards art...ask any HAM :D So I guess after this one were building a transmitter? I wish lol.
The interlaced winding is called Bifilar wind as far I know. I used this in my SMPS transformer wind.
One problem that does arise with bifilar winding is that the interwinding cappscitance shoots trough the roof while the cappacitance of the windings each can be minimused to almost a neglegctable degree for frequencies achievable at home..and thats a lot of MHz

[curtstacy]

Thank you very much! great explanation.

[bbigboy]

Great presentation. Can you suggest how I could model a 50 ohm input impedance circuit driving two separate secondary 50 ohm windings, each connected to a 50 ohm antenna, one circuit of which has phasing control. I want to be able to electrically steer this 2 element antenna array.

[waterfuel]

Help needed! How do I match impedance of inverter16v AC output SOURCE
to 16vAC isolation transformer primary, that I have to hand WIND, for 4
ohms load of 32v AC 6 amps secondary ? Do I use the ohms of primary 16v +
12 amps division or the resistance .06 ohms of inverter output contacts
terminals at 20khz frequency? Voltage and turns ratio same as 1:2. The
online formula for inductance value of turns requires reactance value in
ohms, at the frequency of source.

[australischemediengemeinschaft]

Für diesen Fachfilmbeitrag vergeben wir von maximal erreichbaren 10 Bewertungspunkten: 10

[pfabri]

For a second I thought I was going mad when I saw your pen move from one side to the other UNDERNEATH your writing.