Op-Amp: Current to Voltage Converter (Transimpedance Amplifier) and it's applications
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- Опубліковано 17 тра 2018
- In this video, the current to voltage circuit (using op-amp) and its applications have been discussed.
Why current to voltage conversion?
Many times the sensor or the circuit component (e.g photodiode) gives the output in form of current and it needs to be converted into the voltage to process it or use with the data acquisition systems. So, in such cases, I-V converter can be used to convert the current into the voltage.
Current Controlled Voltage source:
The current to Voltage Converter is an example of Current Controlled Voltage Source because here the input current controls the output voltage.
Passive Current to Voltage Converter and it's limitation:
The passive current to voltage converter can be designed by connecting the resistor R across the current source. But when the load is connected to this converter then the output voltage will change according to the load resistance. So, instead of being independent of the load resistance, here the output voltage will change according to the load resistance. And this problem can be solved by using the active current to voltage converter.
Application of Current to Voltage Converter:
The Current to Voltage Converter is mainly used in photodiode circuits and in Digital to Analog converters.
The timestamps for the different topics covered in the video is given below:
0:28 Why Current to Voltage Conversion is required in the circuits
1:34 Passive Current to Voltage Converter circuit and it's limitations
2:55 Active Current to Voltage Converter using the op-amp
4:43 Application : Current to Voltage Converter in photodiode circuits
5:49 Application: Current to Voltage Converter in Digital to Analog Converter (DAC)
This video will be helpful to all the students of science and engineering in understanding how to design the current to voltage converter using the op-amp.
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The timestamps for the different topics covered in the video is given below:
0:28 Why Current to Voltage Conversion is required in the circuits
1:34 Passive Current to Voltage Converter circuit and it's limitations
2:55 Active Current to Voltage Converter using the op-amp
4:43 Application : Current to Voltage Converter in photodiode circuits
5:49 Application: Current to Voltage Converter in Digital to Analog Converter (DAC)
Tu na thik se video banay ker jo dekhe sab ko samje sab ko
Hawaaa me baat mat kiya ker samja
Myaplifairmekingbacic
Does this type of converter can work well with the piezoelectric based sensor with the charge output??
Its quite funny how he accentuates always the last word in a sentence :D
Sir, In photo resistor application, why we are giving voltage source as input?
I got a little bit confusion in passive I to V convertor .. anyone can explain it?
Thanks you! i am very gratefull for your videos! Greetings from Argentina. Keep uploading videos please!
Great...good explanation....can be undestand smoothly.....keep going.... subscribed👍
What is the max current for this setup
Best xplaination.....I like this channel...thanks for your work
Can I do an orden-n filter with this OA?
Wonderful explanation, great channel, subscribed!
Isn't the DAC the same as summer circuit ?
Can u please post the video with any particular ic.... Plz
very help full tutorials , thank you very much sir
In which tool you make these videos
Sir , please make a video on how we can design signal conditioning module for thermocouple
waaah bahot achha smjhaya..
thanku
Thanks a lot for these nice and useful video
Amazing explanation
Sir.. .what happened if I'm using single power supply (+5v only for op amp) and how to get +ve voltage (+Vout)?
Just reverse the direction of the current. You will get a positive output voltage.
hello, wich circuit can help me to amplified nanoampere from a photoresistor?
This circuit will work. But you need to select the op-amp which has very low noise and very low offset current.
Very nice explanation
Hello Sir I am confused how to take current direction 3:02 T direction towards Vout and 4:51 current direction away form Vout? Could you elaborate on this?
At 3:00, there is a current source at the inverting input terminal. Here, the op-amp is considered as an ideal op-amp. So, no current is flowing into the op-amp terminal. i.e the current has to go away from the inverting node.
At 4:50, you might be aware that photodiode is operated in the reverse biased mode and only photocurrent used to flow in reverse direction. Cathode to Anode. That's why photocurrent direction is shown downward. Once again no current is going into the op-amp terminals. And to satisfy the KCL, the current should enter at the inverting node.
I hope it will clear your confusion.
Respected Sir...At 3:37 by virtual ground concept V- =0 then how come Iin will be there as potential are same(0v) across current source Iin
For ideal op-amp, the voltage is zero. But actually there will be some voltage (in uV) across the current source.
Will this setup work on a single supply AO? Or is it +/- Vcc powered?
Dual supply
Distracting that you use a voice clip of you saying voltage but otherwise thank you for the explanation
Very nice video
Hi sir, very nice video
Please make video on transistor at high frequency
Can i get 10V o/p from circuit giving 20 mA current
Yes, you can. But the biasing voltage of the op-amp should be more than that. (Around 12 to 15V ). And second thing, op-amp should be able to work at that operating voltage.
As you explained at end the 8:34 Vout is -4.5 Volt can we convert it to +4.5Volt by using another opamp by taking (-4.5Volt) input to the inverting pin (i.e it will convert -4.5 to +4.5 with 1 gain)
Yes, definitely
@@ALLABOUTELECTRONICS and what will be output if op-Amp operating voltage +1V, and -1V (just assumed)
will output will be -4.5V or -1V ???
??
please i want a reference on op amp?
A good reference op amp is the ua741
In last application how could you take vo=-i*rf
Considering the ideal op-amp, the concept of the virtual ground is applied.
wow i searched for this topic in only all about electronics on15 may 2018 but now i found it and exited a lot thank u veryrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrryyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy much sir
What about the amplification... Wont the output voltage be amplified
Here, we have a current to voltage conversion. Because here the input is current and the output is voltage. The conversion factor depends on the feedback resistor.
This man needs an op amp on his mic
Why photodiode in reverse biased?
The Photo diode is meant to be used to in the reverse bias mode.
For more info , please check this video on Photo diode:
ua-cam.com/video/kry1aGCU2Go/v-deo.html
Where s load?
Sir what input impedence and output impedence in this case
Because of the virtual ground, the voltage across the current source is ideally zero. So, input impedance will be ideally zero. The output impedance is same as the output impedance of the op-amp.
@@ALLABOUTELECTRONICS thnku so much
Superb!!!!
5:50
Sir can you please start marking videos on Power System Subject
How to design current to voltage converter input 4mA to 20mA and output 1 to 5 V dc
Just use 250 ohm resistor for the conversion. You will get the desired output. Its a standard way to convert it into 1 to 5V DC.
@@ALLABOUTELECTRONICS How would I do a conversion from 4-20mA to 0-5V?
Love these videos. Slowly getting use the heavily accented robotic voice.
Sir please send pdf form
please make videos about BJT and MOSFET
In a time of a week or so I am going start a new series of videos on analog electronics. So, it will get covered in that series.
Sanders was in an ad on your video and that makes me suspicious about you
Thank you for this video. Very informative but hard to understand. Fortunately there are sub-titles available. It could be even clearer with a native English speaker narrating as many people do not fully understand the accent of the Indian sub continent. The structure is unfamiliar and multiple rolling R's are challenging. The math is explanatory, though really it is secondary to the actual physical characteristics of the circuit.
nice but not much explanatory🙂🙂🙂
Generally good videos but very hard to understand the accent. Subtitles do help somewhat.
Our teacher is using SS of these lectures n made his own ppt out of it which is being taught in our class
If u want to sue him I can help …also we have an exam coming
I don't care what the hell you do to it lol....god damn both rails getting there and very close....it will not work right lol
4:48
your pronunciation has removed all my English skill