Question
Download Solution PDFThe amplifier CMRR of μA741 Operational Amplifier is
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFFor practical operational amplimers, The Common Mode Rejection Ratio (CMRR) should be 85 to 105 dB.
Additional Information
CMRR:.
Common Mode Rejection Ratio (CMRR) is defined as the ratio of differential-mode gain to common-mode gain taken in magnitude
CMRR stands for Common Mode Rejection Ratio It is the ability of an operational amplifier to reject the common-mode signals at the input terminals
Mathematically, this is expressed as:
\(\rm CMRR = \dfrac{A_d}{A_c}\)
Ad = Differential gain
Ac = Common mode gain
Note:
For Ideal operational amplimers, The Common Mode Rejection Ratio (CMMR) should be infinity.
Ideal Characteristics of op-amp:
|
Characteristics Parameter |
Ideal value |
Practical value |
|
Voltage Gain (Av) |
∞ |
≈ 106 |
|
Input Resistance (Ri) |
∞ |
≈ 1 MΩ |
|
Output Resistance (R0) |
0 |
≈ 10 Ω to 100 Ω |
|
Bandwidth (B.W) |
∞ |
≈ 1 MHz |
|
Slew Rate (S.R) |
∞ |
≈ 80 V/μs |
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