In this video, What is Common mode rejection ratio (CMRR) of op-amp,
What is differential mode of op-amp,
How much noise in single-ended amplifier and Noise in differential amplifier,
How to configure op-amp in differential mode,
How to configure op-amp in common mode,
What is the voltage gain of op-amp,
What is the CMRR formula of op-amp,
How to convert CMRR in dB,
Why CMRR of op-amp is important,
All these topics are explained with examples and derivations.
CMRR: It is the Ratio of Differential gain (ADM) and Common-mode gain (ACM)
CMRR(dB) = 20 log 10 ADM/ACM,
If both input signals of OP-Amp are Exactly in phase and Exactly equal in amplitude they are called Common mode signals, Generally the common mode signals are 50Hz or 60Hz Noise signals generated by adjacent current carrying conductor by building and collapsing of magnetic fields,
OP-Amp rejects or Not amplifies the common mode signals
CMRR of OP-Amp is its ability to reject Common Mode signals, The larger the CMRR, better at eliminating Common Mode signals,
Ideal op-amp has the value of common mode gian = 0 (zero),
But practical op-amp has some value (lesser than 1) of common mode gain.
As the frequency increases, CMRR will reduce,
CMRR is generally specified at 60Hz, which is the line frequency,
If input frequency is lesser than Noise frequency, We use low pass filter to get Input signal.
The timestamps for different topics covered in this video are as follows,
0:40 - Common mode signals Vs Differential mode signals,
2:31 - OP-Amp Differential mode configuration,
3:23 - OP-Amp Common mode configuration,
4:03 - Voltage gains of OP-Amp,
5:48 - CMRR formula Explanation,
7:00 - Importance of CMRR,
8:35 - Examples and Solutions
11:49 - CMRR Vs Frequency.
Links for related videos on OP-Amp,
1) Op-Amp Basic concepts:
www.youtube.com/watch?v=aV_ll...
2)Op-Amp Basic parameters:
www.youtube.com/watch?v=jhtPW...
3) OP- Amp - 3 Gain Bandwidth product :
www.youtube.com/watch?v=A1A1g...
4) OP - Amp - 4 Slew Rate :
• OP-Amp Slew Rate With ...
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