A brilliant explanation of these Impedance converters! Our Prof introduced this kind of Opamp-curcuits as gyrators - without in-depth analysis, since he found, analog-circuits where outdated. Of course, this is true, if you have a fast DSP-capable Microcontroller, that can handle convolution- and/or FFT-operations. In this case, FIR-, or IIR-filters are just the right thing to create any impedance.
@debrainwasher Thanks for the comment and sharing your thoughts. Glad that you liked this Impedance Converter Analog Circuit Design with Op Amp video. I would not say Analog circuits are outdated at all. While digital circuits are everywhere, there are still considerable applications that require analog circuit design including mixed signal design, sensor interfacing, data converters, extremely low power circuits, Neuromorphic computing that aims to mimic the structure and operation of the human brain, using artificial neurons and synapses to process information (for example neural processors used for artificial intelligence). For more example see the following two UA-cam playlist in my channel: Analog and Op Amp Circuit Design Videos ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html Digital Circuits and Digital Signal Processing ua-cam.com/play/PLrwXF7N522y6cSKr0FmEPP_zQl011VvLr.html
@@STEMprof I agree, there are applications, where Opamp-Circuits are still useful - particularly in signal-preprocessing. I did and still do many analog-designs. In many cases, particularly, when enough ressources are present, DSP is simply the better choice, since there are no component tolerances, temperature-problems, power losses, or even RFI-, or high voltage issues. A couple of years ago, I designed an adaptive, active RFI mains-power filter (230VAC) with power factor correction for a customer. I used two class-D H-Bridges with power-FETs and a large electrolytic capacitor as a reactance - controllable as a capacitance, inductance - or both. The transfer function was created in real time by Hanning-windowed FFT and IFFT. It worked quite well, but above ca. 170kHz, the bandwidth of the power-circuit was exhausted, while targeted switching noise went a magnitude higher. Therefore, the project has been abandoned. Today, contemporary GaN-FET and fast FPGA could probably do the job.
How to Design Analog Impedance Converter? How to convert capacitance to inductance? How to design virtual inductor? How to simulate very large inductance? How does general impedance converter work? These questions are discussed in this analog design video. For more Circuit examples see: Converting Capacitance to Inductance ua-cam.com/video/weIHG45G6Pg/v-deo.html Negative Inductance Design Op Amp Impedance Converter ua-cam.com/video/GF_Mun_Mkyo/v-deo.html Active Inductor with Op Amps ua-cam.com/video/6IYz4iaa05c/v-deo.html Analog Computer circuit that solves Differential Equation ua-cam.com/video/HeZRtnRXpEI/v-deo.html Capacitor to Inductor Converter Circuit ua-cam.com/video/weIHG45G6Pg/v-deo.html Operational Amplifier Gyrator Network Circuit ua-cam.com/video/2KpjAytRBpc/v-deo.html To see more op amp and analog circuits examples please check analog design playlist ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html I hope these Circuit engineering and analysis videos are helpful.
You're welcome. Glad that you liked my videos. Here are a few related circuit examples: Negative Inductance Design ua-cam.com/video/GF_Mun_Mkyo/v-deo.html Converting Capacitance to Inductance with Op Amp Circulator Amplifier ua-cam.com/video/weIHG45G6Pg/v-deo.html Impedance Converter Design with Op Amp (Gyrator) ua-cam.com/video/jPudh9yqDH4/v-deo.html , Active Inductor with Op Amps ua-cam.com/video/6IYz4iaa05c/v-deo.html I hope these examples are interesting as well.
Very nice and concise explanation, thanks. An additional closing comment of Rin(f) would also be useful to readers as L=R^2*C only holds as long as both OpAmps in their pass band. OpAmps show low pass behaviour. Above certain frequency OpAmps may need additional components to hold or simply Rin no longer holds as expected. Have you built one? When you do I suggest you use the old yet reliable LM741, and then replace with the faster LM358, you will see the difference. There are better OpAmps than 741 or 358, but then cost goes up.
You're welcome. Glad that you liked this video and Thanks for sharing your thoughts. The LM741 Op Amp is a legend among operational amplifiers. It has been taught in circuit design courses since early 90s. With that said, I have listed a few more recent well-designed op amps for gain-bandwidth product up to 8 GHz (from Texas Instruments and Analog Devices) in the video ua-cam.com/video/oyz6lTGd2Xo/v-deo.html that focuses on Op Amp Amplifier with -25 to 55 dB Attenuation-Gain range. I hope it is useful.
Remember working on an 8 H simulated inductor sub-circuit in an IC years ago. As part of verifying the performance, I found a 6 H physical inductor (large) to use in a reference circuit to compare the performance of the simulated inductor.
Thanks for sharing your interesting experience 👍. What was the result of performance comparison? And I hope you also like the following two related videos: Negative Inductance Design ua-cam.com/video/GF_Mun_Mkyo/v-deo.html And Floating Inductance with Op Amp Circulator Amplifier ua-cam.com/video/weIHG45G6Pg/v-deo.html
A brilliant explanation of these Impedance converters! Our Prof introduced this kind of Opamp-curcuits as gyrators - without in-depth analysis, since he found, analog-circuits where outdated. Of course, this is true, if you have a fast DSP-capable Microcontroller, that can handle convolution- and/or FFT-operations. In this case, FIR-, or IIR-filters are just the right thing to create any impedance.
@debrainwasher Thanks for the comment and sharing your thoughts. Glad that you liked this Impedance Converter Analog Circuit Design with Op Amp video. I would not say Analog circuits are outdated at all. While digital circuits are everywhere, there are still considerable applications that require analog circuit design including mixed signal design, sensor interfacing, data converters, extremely low power circuits, Neuromorphic computing that aims to mimic the structure and operation of the human brain, using artificial neurons and synapses to process information (for example neural processors used for artificial intelligence). For more example see the following two UA-cam playlist in my channel:
Analog and Op Amp Circuit Design Videos ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html
Digital Circuits and Digital Signal Processing ua-cam.com/play/PLrwXF7N522y6cSKr0FmEPP_zQl011VvLr.html
@@STEMprof I agree, there are applications, where Opamp-Circuits are still useful - particularly in signal-preprocessing. I did and still do many analog-designs. In many cases, particularly, when enough ressources are present, DSP is simply the better choice, since there are no component tolerances, temperature-problems, power losses, or even RFI-, or high voltage issues. A couple of years ago, I designed an adaptive, active RFI mains-power filter (230VAC) with power factor correction for a customer. I used two class-D H-Bridges with power-FETs and a large electrolytic capacitor as a reactance - controllable as a capacitance, inductance - or both. The transfer function was created in real time by Hanning-windowed FFT and IFFT. It worked quite well, but above ca. 170kHz, the bandwidth of the power-circuit was exhausted, while targeted switching noise went a magnitude higher. Therefore, the project has been abandoned. Today, contemporary GaN-FET and fast FPGA could probably do the job.
Well said. Thanks for sharing your thoughts and observations. I hope you enjoy this channel.
How to Design Analog Impedance Converter? How to convert capacitance to inductance? How to design virtual inductor? How to simulate very large inductance? How does general impedance converter work? These questions are discussed in this analog design video. For more Circuit examples see: Converting Capacitance to Inductance ua-cam.com/video/weIHG45G6Pg/v-deo.html
Negative Inductance Design Op Amp Impedance Converter ua-cam.com/video/GF_Mun_Mkyo/v-deo.html
Active Inductor with Op Amps ua-cam.com/video/6IYz4iaa05c/v-deo.html
Analog Computer circuit that solves Differential Equation ua-cam.com/video/HeZRtnRXpEI/v-deo.html
Capacitor to Inductor Converter Circuit ua-cam.com/video/weIHG45G6Pg/v-deo.html
Operational Amplifier Gyrator Network Circuit ua-cam.com/video/2KpjAytRBpc/v-deo.html
To see more op amp and analog circuits examples please check analog design playlist ua-cam.com/play/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt.html
I hope these Circuit engineering and analysis videos are helpful.
Great videos. Thanks.
You're welcome. Glad that you liked my videos. Here are a few related circuit examples:
Negative Inductance Design ua-cam.com/video/GF_Mun_Mkyo/v-deo.html
Converting Capacitance to Inductance with Op Amp Circulator Amplifier ua-cam.com/video/weIHG45G6Pg/v-deo.html
Impedance Converter Design with Op Amp (Gyrator) ua-cam.com/video/jPudh9yqDH4/v-deo.html ,
Active Inductor with Op Amps ua-cam.com/video/6IYz4iaa05c/v-deo.html
I hope these examples are interesting as well.
Very nice and concise explanation, thanks.
An additional closing comment of Rin(f) would also be useful to readers as L=R^2*C only holds as long as both OpAmps in their pass band.
OpAmps show low pass behaviour.
Above certain frequency OpAmps may need additional components to hold or simply Rin no longer holds as expected.
Have you built one? When you do I suggest you use the old yet reliable LM741, and then replace with the faster LM358, you will see the difference. There are better OpAmps than 741 or 358, but then cost goes up.
You're welcome. Glad that you liked this video and Thanks for sharing your thoughts. The LM741 Op Amp is a legend among operational amplifiers. It has been taught in circuit design courses since early 90s. With that said, I have listed a few more recent well-designed op amps for gain-bandwidth product up to 8 GHz (from Texas Instruments and Analog Devices) in the video ua-cam.com/video/oyz6lTGd2Xo/v-deo.html that focuses on Op Amp Amplifier with -25 to 55 dB Attenuation-Gain range. I hope it is useful.
Remember working on an 8 H simulated inductor sub-circuit in an IC years ago. As part of verifying the performance, I found a 6 H physical inductor (large) to use in a reference circuit to compare the performance of the simulated inductor.
Thanks for sharing your interesting experience 👍. What was the result of performance comparison? And I hope you also like the following two related videos: Negative Inductance Design ua-cam.com/video/GF_Mun_Mkyo/v-deo.html
And Floating Inductance with Op Amp Circulator Amplifier ua-cam.com/video/weIHG45G6Pg/v-deo.html