Questions tagged [cmrr]
Common-mode rejection ratio (CMRR) is the measure of rejection by the device of unwanted input signals common to both input leads, relative to the wanted difference signal.
10
questions with no upvoted or accepted answers
2
votes
0answers
71 views
First principles modeling of op amp CMRR
Introduction
I'm trying to analyze an op amp circuit from first principles (i.e. without using the two rules of ideal op amp analysis -- virtual short circuit and infinite input impedance). The ...
2
votes
1answer
146 views
ECG / EEG Amplifier design tricks
First of all, sorry, I missed the links / images where I have found the solutions mentioned below (I hope, if you are familiar with this topic, you know them):
I have to design an ECG / EEG analog ...
2
votes
2answers
244 views
Why does CMRR degrade in an instrumenation amplifier when the feedback resistor is increased?
Why does CMRR degrade in an instrumenation amplifier when the feedback resistor is increased, keeping all other resistances constant at a fixed value? What mathematical relationship links the feedback ...
1
vote
0answers
33 views
What are the IEC standards/certifications to look for in a DSO while making measurements pertaining analog parameters like CMRR, SNR, THD etc
I am in the process of measuring CMRR for our mixed signal system that deals with bio-signal acquisition. I am using DSOX2014A keysight entry-level oscilloscope to make measurement to derive CMRR, SNR ...
1
vote
1answer
152 views
How can I calculate CM and DM gains for this model?
Regarding the second page of this document, at the first example it calculates the DC CMR due to line imbalance Rs and explanation is given in the first paragraph below(ignore the second example):
...
1
vote
0answers
149 views
Common mode choke to boost cmrr of transformer input
I was wondering, can a common mode choke be used to enhance the CMRR of a transformer coupled amplifier Even further?
What are the drawbacks?
0
votes
1answer
67 views
Can someone help me understand why exactly high CMRR is so important, particularly in medical instrumentation like ECG?
So I have spent days reading about specifics of op-amps, instrumentation amps, and ECG circuitry and it just isn't clicking for me.
As I understand it, the common mode signal gets amplified and added ...
0
votes
0answers
32 views
Capacitor Array Tolerance of Caps in Same Package
Consider an MLCC capacitor array like CA064X471J5GACTU. Its tolerance is 5% but does this apply to capacitors within the same package?
More specifically, I am wondering if the tolerance of caps within ...
0
votes
1answer
41 views
How calculate the error offset or the noise threshold for MyoWare and FSR sensors?
I am working on EMG and FMG signals to extract time domine features and i need a threshold value for some features. I must calculate it from the characteristics of MyoWare and FSR sensors.For the ...
0
votes
1answer
74 views
How do I find CMRR?
How do I find the common-mode rejection ratio, CMRR for this circuit? I know I have to find differential gain and common-mode gain as 'differential mode gain/commonmode gain' but with current mirrors ...
