Question
Download Solution PDFThe Common Mode Rejection Ratio (CMRR) of an ideal OP-Amp is ________.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCMRR (Common mode rejection ratio) is defined as the ratio of differential-mode voltage gain (Ad) and the common-mode voltage gain (Ac).
Mathematically, this is expressed as:
Ad = Differential gain
Ac = Common mode gain
Ideally, the common-mode gain of the Op--Amp should be zero., i.e. it must give a zero output for common input at both the inverting and non-inverting terminal. ∴ The CMRR of an ideal Op-Amp is 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 |
|
Common mode rejection ratio (CMRR) |
∞ |
≈ 106 or 120 dB |
|
Slew Rate (S.R) |
∞ |
≈ 80 V/μs |
Last updated on Jul 5, 2025
-> RRB ALP CBT 2 Result 2025 has been released on 1st July at rrb.digialm.com.
-> RRB ALP Exam Date OUT. Railway Recruitment Board has scheduled the RRB ALP Computer-based exam for 15th July 2025. Candidates can check out the Exam schedule PDF in the article.
-> Railway Recruitment Board activated the RRB ALP application form 2025 correction link, candidates can make the correction in the application form till 31st May 2025.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> Bihar Home Guard Result 2025 has been released on the official website.
-> The Railway Recruitment Board (RRB) has released the official RRB ALP Notification 2025 to fill 9,970 Assistant Loco Pilot posts.
-> The official RRB ALP Recruitment 2025 provides an overview of the vacancy, exam date, selection process, eligibility criteria and many more.
->The candidates must have passed 10th with ITI or Diploma to be eligible for this post.
->The RRB Assistant Loco Pilot selection process comprises CBT I, CBT II, Computer Based Aptitude Test (CBAT), Document Verification, and Medical Examination.
-> This year, lakhs of aspiring candidates will take part in the recruitment process for this opportunity in Indian Railways.
-> Serious aspirants should prepare for the exam with RRB ALP Previous Year Papers.
-> Attempt RRB ALP GK & Reasoning Free Mock Tests and RRB ALP Current Affairs Free Mock Tests here