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Dear LvW,
Thank you very much, for your good explanation!
And yes, I forgot the auto-oscillations, a very critical point for stability.
About the plane gain or frequency response in AC (less than 3dB) I think it is very important because if you need an unit gain amplifier and it does not...
Dear Jester,
I am going to explain how an Opamp works in an easy way, I know some users could criticize my way, I need to say I will glad if someone could explain us a better way. I hope you can solve your doubt and learn of our experience.
An Operational Amplifier (OA in next) has 2...
Dear mr_byte31,
The circuit you posted in my opinion works as a impedance matching and as band pass filter too, however, it does not have a very good rejection to other frecuencies. I think you could try with a low pass filter. An easy filter to do which has good rejection for upper...
Dear israel_Y,
I was thinking in your question and I thought in a pasive adder, If you connect a resistor to +3V and you signal source give voltage values between -3 to 0V, then, in resistors' midle point, you will have values from 0 to +1.5V.
I hope it cal help you.
Have a nice day,
Best...
Dear Jester,
If you want to make an 100% stable amplifier, you must set Opamp's gain to 1, how you can do it? It is easy, only connect the output to inv input directly.
About you say of R9 to 150K, yes you can do it without problem, R9 and R11 are a voltage divisor, if you increase r9's...
Re: NEED HELP ,how to calaculate the gate resistance of Igbt (fg25n120) /Mosfet
Dear FvM,
Here you have the FGA25N120AN datasheet: http://pdf.datasheetcatalog.com/datasheet2/3/06q3wuijwx6gu4q3rth95c2z96wy.pdf
I hope it can be helpful.
Dear mobin,
I was checking your last...
Dear israel_Y,
The easiest way to do it is using another Opamp and inverting it again, I draw it for you in the attached file, check please and tell me if that is helpful for you.
Have a nice day,
Best regards,
Juan
Re: NEED HELP ,how to calaculate the gate resistance of Igbt (fg25n120) /Mosfet
Dear Mobin,
Yes, you are right about d1, d2 (they discharge faster Cgs and Cgd to source) and R1, R2 limit corrent and.
About UF5408 between Collector and Emitter, please, check the code after 120 (generally...
Re: NEED HELP ,how to calaculate the gate resistance of Igbt (fg25n120) /Mosfet
You are welcome Mobin!
About you questions:
1,2) Your transistor you have to Calculated impedance of 1304 ohms , but the Rg needs to charge and discharge the Cgd Cge and fast , to limit generator 's current and to...
Re: NEED HELP ,how to calaculate the gate resistance of Igbt (fg25n120) /Mosfet
Hello mobinmk,
You could have the worst capacitance value, in this case Cies = 2700pF.
Then you can calculate the "Gate impedance" with the capacitive reactance formula:
In it case: 1 / (2.Pi.Freq.C) => 1 /...
Hello victoryrez,
For 10GHz, Time= 100pS.[/B] 50% duty cycle: 50pS rise time and, 50% 50pS fall time.
5GHz, Time= 200pS. 50% duty cycle: 100pS rise time and, 50% 100pS fall time.
Then as you say: For 5GHz, Time= 200pS. 10% duty cycle: 20pS rise time, and 90% 180pS fall...
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