Impedance Converter Analog Circuit Design with Op Amp (GIC and NIC)

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How to Design Analog Impedance Converter? How to convert capacitance to inductance? How to design virtual inductor? How to simulate very large inductance? How to convert inductor to capacitor? How does general impedance converter work? These questions are discussed and answered in this analog circuit design video. This impedance converter circuit is designed with two operational amplifiers and up to five impedances. This circuit is effectively a nested double NIC or negative impedance converter. The resulting GIC circuit has an input impedance Rin (or Zin) that is equal to product of odd numbered impedances divided by the product of the even numbered impedances, meaning Zin = Rin = Z1*Z3*Z5 / (Z2*Z4). With proper selection of components we can convert 1/CS capacitance to LS inductance. It is also possible to simulate or construct a new unique device that its voltage is proportional to the second derivative of its electric current. Such device has practical applications in modeling the mechanical system (mass, spring, damper) by converting it into electric analog circuit using Op Amp, resistor, capacitor or inductor. For more examples see ‪@STEMprof‬ Analog playlist • Electrical Engineering...

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2 окт 2024

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Комментарии : 11

@debrainwasher 7 месяцев назад

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introduced this kind of Opamp-curcuits as gyrators - without in-depth analysis, since he found, analog-circuits where outdated.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.

@STEMprof 7 месяцев назад

@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 I would not say Analog circuits are outdated at all.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 RU-vid playlist in my channel: Analog and Op Amp Circuit Design Videos ru-vid.com/group/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt Digital Circuits and Digital Signal Processing ru-vid.com/group/PLrwXF7N522y6cSKr0FmEPP_zQl011VvLr

@debrainwasher 7 месяцев назад

@@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.

@STEMprof 7 месяцев назад

Well said. Thanks for sharing your thoughts and observations. I hope you enjoy this channel.

@STEMprof 7 месяцев назад

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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-weIHG45G6Pg.html Negative Inductance Design Op Amp Impedance Converter ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-GF_Mun_Mkyo.html Active Inductor with Op Amps ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6IYz4iaa05c.html Analog Computer circuit that solves Differential Equation ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-HeZRtnRXpEI.html Capacitor to Inductor Converter Circuit ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-weIHG45G6Pg.html Operational Amplifier Gyrator Network Circuit ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-2KpjAytRBpc.html To see more op amp and analog circuits examples please check analog design playlist ru-vid.com/group/PLrwXF7N522y4c7c-8KBjrwd7IyaZfWxyt I hope these Circuit engineering and analysis videos are helpful.

@johnbofarullguix1499 7 месяцев назад

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.

@STEMprof 7 месяцев назад

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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-oyz6lTGd2Xo.html that focuses on Op Amp Amplifier with -25 to 55 dB Attenuation-Gain range. I hope it is useful.

@brucesmith9144 7 месяцев назад

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.

@STEMprof 7 месяцев назад

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 ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-GF_Mun_Mkyo.html And Floating Inductance with Op Amp Circulator Amplifier ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-weIHG45G6Pg.html

@LousyPainter 7 месяцев назад

Great videos. Thanks.

@STEMprof 7 месяцев назад

You're welcome. Glad that you liked my videos. Here are a few related circuit examples: Negative Inductance Design ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-GF_Mun_Mkyo.html Converting Capacitance to Inductance with Op Amp Circulator Amplifier ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-weIHG45G6Pg.html Impedance Converter Design with Op Amp (Gyrator) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-jPudh9yqDH4.html , Active Inductor with Op Amps ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-6IYz4iaa05c.html I hope these examples are interesting as well.