The link for the notes: www.allaboutelectronics.org/cascode-amplifier-using-mosfet-explained/ Timestamps : 0:00 What is Cascode Amplifier? 1:22 Why Cascode Amplifier is used in integrated circuits? 2:36 Output Impedance of Cascode Amplifier (Small signal analysis) 8:00 Intrinsic Gain of Cascode Amplifier (Small signal analysis) 16:02 Effect of various load on the voltage gain of the cascode amplifier 19:49 Cascode amplifier with Cascode current source as a load
At time 6:11 in the video, I thought the equation should be Vx=[ i_x - g_m2 * (-i_x * r_o1 ) ]* r_o2 + i_x * r_o1 it seems to me that in your top most equation at timestamp 6:11 you have a plus sign instead of a minus sign before g_m2. Is this an error?
at 11:56 ,sir while doing nodal analysis ,why we have written vds2/ro2 it should be (vds2-vgs1)/ro2, because source of 2nd mosfet is not at ground at all.
I think you are talking about small-signal analysis right ?? If vgs2 = 0 then the second MOSFET can be replaced by its output impedance. Ro2 and Ro1 will be in parallel.
Just consider the entire circuit as a two-port network. The transconductance Gm is the ratio of output current to the input voltage. If you recall the two-port network lectures then it is Y-parameter. I2/V1 when V2 = 0. That's why while finding Gm, output was grounded. I hope, it will clear your doubt.
Yes, there will be a minus sign. But in the video if you observe, then only magnitude of intrinsic gain |Ao| is represented. That's why there is no negative sign.
The link for the notes: www.allaboutelectronics.org/cascode-amplifier-using-mosfet-explained/
Timestamps :
0:00 What is Cascode Amplifier?
1:22 Why Cascode Amplifier is used in integrated circuits?
2:36 Output Impedance of Cascode Amplifier (Small signal analysis)
8:00 Intrinsic Gain of Cascode Amplifier (Small signal analysis)
16:02 Effect of various load on the voltage gain of the cascode amplifier
19:49 Cascode amplifier with Cascode current source as a load
Very nicely explained easy to understand 👌👍👋
Best👍🏻 thank you for sharing 👌🏻👌🏻
At time 6:11 in the video, I thought the equation should be Vx=[ i_x - g_m2 * (-i_x * r_o1 ) ]* r_o2 + i_x * r_o1 it seems to me that in your top most equation at timestamp 6:11 you have a plus sign instead of a minus sign before g_m2. Is this an error?
at 11:56 ,sir while doing nodal analysis ,why we have written vds2/ro2 it should be (vds2-vgs1)/ro2, because source of 2nd mosfet is not at ground at all.
Excellent as usual 👍👍
well explained! Kindly make more videos on practice questions also!
Very good explaination 🔥🔥
Very thankful.
When performing small signal analysis, shouldnt Vgs2 = 0 so Id2 is zero (because Vgs2 is a DC voltage source)?
Very good explanation
very nice explaination
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If ac source is at the bottom transistor, what will happen if you keep Vgs2=0 and do the small-signal analysis?
I think you are talking about small-signal analysis right ??
If vgs2 = 0 then the second MOSFET can be replaced by its output impedance. Ro2 and Ro1 will be in parallel.
Great!
Hi great content, What video should I watch for the higher bandwidth discussion?
I haven't discussed about yet. I am going to cover it soon. (The high frequency response).
@@ALLABOUTELECTRONICS great thanks! really good channel BTW.
Nice 👍👍👍👍
Why we have to ground the output voltage to find eqivalent Gm?
Just consider the entire circuit as a two-port network. The transconductance Gm is the ratio of output current to the input voltage. If you recall the two-port network lectures then it is Y-parameter. I2/V1 when V2 = 0. That's why while finding Gm, output was grounded. I hope, it will clear your doubt.
❤️❤️love you bro
Shouldn't there be minus sign in the intrinsic gain of the cascode amplifier ?
Yes, there will be a minus sign. But in the video if you observe, then only magnitude of intrinsic gain |Ao| is represented. That's why there is no negative sign.
@@ALLABOUTELECTRONICS excellent, thanks for the fast and analytic reply
love it ❤❤
Please provide the notes in pdf form .so that easy to revise these topic..
The notes for the same is already updated on the website. Check this link : www.allaboutelectronics.org/cascode-amplifier-using-mosfet-explained/
12:11
i need subtitle :(
Yeah but how does it work in a few sentences without all the math?