RC High Pass Filter Explained

In this video, passive RC High Pass Filter has been discussed.

What is electronic filter:

The electronic filter is the circuit, which passes some range of frequencies of the input signal and rejects or attenuates the unwanted frequencies in the signal.

Based on the range of frequencies which is being passed by the filter, there are 4 different types of filter.

1) Low Pass Filter

2) High Pass Filter

3) Band pass Filter

4) Band Reject Filter

What is High Pass Filter:

A high-pass filter is an electric circuit, which passes the high-frequency components in the signal and rejects or attenuates low-frequency components. So, the ideal high pass filter passes all high frequencies starting from the cut-off frequency (fc) up to the infinite frequency, and it rejects all low frequencies which are less than the cut-off frequency (fc).

But the actual high pass filter does not support all high frequencies up to infinity. The actual response depends upon the electrical components used in the circuit. So, the maximum frequency supported by the high pass filter depends upon the electrical characteristic of the circuit.

Now, based on the components used for the design, this high pass filters further can be classified into 2 categories.

1) Active High Pass Filter:
If the filter is designed using the active components like Op-Amp and transistors then such filters are known as active high pass filter.

2) Passive high Pass Filter:
If the high pass filter is designed using the passive components like R, L and C then such filters are known as passive high pass filters.

These are the most common types of Passive Low Pass Filters.

1) RC High Pass filter
2) RL High Pass Filter
3) RLC High pass filter

So, in this video first order RC High pass filter has been discussed and at the later part of the video, it is shown that how by cascading first order high-pass filters, we can design higher order filters.

The order of the filter can be defined by the number of poles in the transfer function of the filter.
(One simple way to find the order of the filter is to calculate the number of reactive components in the circuit, i.e capacitor, and inductor, but always it is not true. There might be some exceptions)
But in general, this procedure can be followed.

The time-stamped link for the different topics in the video is given below:

0:30 RC High Pass Filter

2:27 Frequency Response of first order high pass filter.

3:11 Derivation of cut-off frequency expression

5:03 Derivation of Phase expression for high pass filter

7:10 Phase vs Frequency curve for first order high pass filter

7:56 Example on High Pass Filter

12:05 Higher order filter design by cascading first order filters

This video will be helpful to all students of science and engineering in understanding the RC High pass filter.

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Music Credit:

[albertargilagaclaramunt]

Amazing video, thanks!!! I saw 20 videos of audio people talking about crossovers and hi-low pass filters, yours is the only one that really explains it well.

[srivatsaa.r.]

sir,
yr video on pASSIVE HIGH PASS FILTER AND AN EXAMPLE OF DESIGNING A CIRCUIT IS VERY GOOD AND CLEAR. GOOD EXPLANATION.
THANKS
S.VATSA, BANGALORE

[rvndom]

you got me through my ee degree and here you are getting me through interviews

[tusharjamwal]

I was thinking about getting into some basic analog signal processing for radio signals as well as things like designing cross overs for custom speakers. This helped a lot. Thank you 🙏

[arsalansyed]

bro you are actually a legend at teaching

[srivatsaa.r.]

sir
yr video on BAND PASS FILTER AND YR EXPLANATION IS EXCELLENTLY BROUGHT OUT. IT HELPED ME TO UNDERSTAND BETTER.
THANKS
S.VATSA. BANGALORE

[ganeshdilli]

I'm glad to see this video, it solve my doubts about hpf thank

[kimjong-un]

Your intro sounds like your making makeup tutorials :D

[deanmichaelk]

Thanks for the video. What did you mean when you mentioned the next stage will get loaded if you choose the value of R in Ohms? I just don't understand the concept!!

[sledge]

all about electronics is nothing but life saver

[sumanapain]

Very nicely described... Thank you so much

[deanmichaelk]

Also at 11:39 of this video, you said, " So, now suppose, in your design if you want that at 1 KHz..." I'm not quite sure what we want at 1 KHz. "that" refers to what? Thanks!!

[indianlad]

Thanks.. Would be helpful if you could also solve some questions..

[abhijithanilkumar]

Oh sir so in Rx phase shift oscillator we are using a 3 stage cascaded RC high pass filter in feedback path right
So is it like they pass all frequency components of the noise above this cut off frequency of 1/2πRC but only this 1/2πRC frequency makes transfer function of feedback network Beta=1/29 and with A=29 we can satisfy Barkhausen criteria and they sustain
And for all the ones above this frequency that has passed this feedback filter network do not satisfy Barkhausen criteria thus won't be sustained???
Sorry for such a long question

[rashedriju]

please make videos on transfer function

[rashedriju]

when you took the magnitude how come the denominator Xc and R became summation of square of it at 4:01 ?
Please explain it kindly

[SomaSaiKarthikDuvvuri]

Sir why didn't we place the Buffer in Second Order Low Pass Filter as we have placed for the Second order High Pass Filter

[onythebst]

So would just the positive terminal coming off an amplifier go into this circuit and the resistor gets its own ground or does the positive and negative terminals from the amplifier go into this circuit?

[xXmayank.kumarXx]

10:29
do you mean 20kΩ "rheostat"?

[aryamehta]

why you sometime use sometime Xc = 1/(jwC) sometimes Xc = 1/(wC) ? i am confused.