What is the purpose of op-amp in the output of Instrumentation amplifier











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I encountered a problem while solving an analog circuit.
I just need to know the purpose of the last op-amp (K4) at this circuit:



enter image description here



while solving I understand it just amplify the output voltage from the Instrumentation Amplifier, but there is known purpose for it beside to amplify Vout3.



thanks!










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New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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  • Is this from EEG or EKG or EMG sensors?
    – analogsystemsrf
    yesterday










  • it just a problem from my homework. I know this kind of circuits very common so possibly it used in these sensors.
    – Michael Astahov
    8 hours ago















up vote
2
down vote

favorite












I encountered a problem while solving an analog circuit.
I just need to know the purpose of the last op-amp (K4) at this circuit:



enter image description here



while solving I understand it just amplify the output voltage from the Instrumentation Amplifier, but there is known purpose for it beside to amplify Vout3.



thanks!










share|improve this question







New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




















  • Is this from EEG or EKG or EMG sensors?
    – analogsystemsrf
    yesterday










  • it just a problem from my homework. I know this kind of circuits very common so possibly it used in these sensors.
    – Michael Astahov
    8 hours ago













up vote
2
down vote

favorite









up vote
2
down vote

favorite











I encountered a problem while solving an analog circuit.
I just need to know the purpose of the last op-amp (K4) at this circuit:



enter image description here



while solving I understand it just amplify the output voltage from the Instrumentation Amplifier, but there is known purpose for it beside to amplify Vout3.



thanks!










share|improve this question







New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I encountered a problem while solving an analog circuit.
I just need to know the purpose of the last op-amp (K4) at this circuit:



enter image description here



while solving I understand it just amplify the output voltage from the Instrumentation Amplifier, but there is known purpose for it beside to amplify Vout3.



thanks!







op-amp analog instrumentation-amplifier






share|improve this question







New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









share|improve this question




share|improve this question






New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.









asked yesterday









Michael Astahov

132




132




New contributor




Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





New contributor





Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.






Michael Astahov is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












  • Is this from EEG or EKG or EMG sensors?
    – analogsystemsrf
    yesterday










  • it just a problem from my homework. I know this kind of circuits very common so possibly it used in these sensors.
    – Michael Astahov
    8 hours ago


















  • Is this from EEG or EKG or EMG sensors?
    – analogsystemsrf
    yesterday










  • it just a problem from my homework. I know this kind of circuits very common so possibly it used in these sensors.
    – Michael Astahov
    8 hours ago
















Is this from EEG or EKG or EMG sensors?
– analogsystemsrf
yesterday




Is this from EEG or EKG or EMG sensors?
– analogsystemsrf
yesterday












it just a problem from my homework. I know this kind of circuits very common so possibly it used in these sensors.
– Michael Astahov
8 hours ago




it just a problem from my homework. I know this kind of circuits very common so possibly it used in these sensors.
– Michael Astahov
8 hours ago










1 Answer
1






active

oldest

votes

















up vote
4
down vote



accepted










K4 produces amplification for AC signals whilst providing a DC amplification of 1 (so that DC levels are maintained from the InAmp output to whatever stage follows K4). It might also be used to share the burden of AC signal gain between InAmp and itself thus minimizing slew rate problems in the InAmp.






share|improve this answer





















  • thanks Andy for the quick reponse.
    – Michael Astahov
    yesterday










  • So - the last stage acts as a sort of highpass.
    – LvW
    yesterday










  • @LvW are you asking or saying!
    – Andy aka
    yesterday










  • @Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
    – LvW
    yesterday










  • @LvW it's always best to be careful!!
    – Andy aka
    yesterday











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
4
down vote



accepted










K4 produces amplification for AC signals whilst providing a DC amplification of 1 (so that DC levels are maintained from the InAmp output to whatever stage follows K4). It might also be used to share the burden of AC signal gain between InAmp and itself thus minimizing slew rate problems in the InAmp.






share|improve this answer





















  • thanks Andy for the quick reponse.
    – Michael Astahov
    yesterday










  • So - the last stage acts as a sort of highpass.
    – LvW
    yesterday










  • @LvW are you asking or saying!
    – Andy aka
    yesterday










  • @Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
    – LvW
    yesterday










  • @LvW it's always best to be careful!!
    – Andy aka
    yesterday















up vote
4
down vote



accepted










K4 produces amplification for AC signals whilst providing a DC amplification of 1 (so that DC levels are maintained from the InAmp output to whatever stage follows K4). It might also be used to share the burden of AC signal gain between InAmp and itself thus minimizing slew rate problems in the InAmp.






share|improve this answer





















  • thanks Andy for the quick reponse.
    – Michael Astahov
    yesterday










  • So - the last stage acts as a sort of highpass.
    – LvW
    yesterday










  • @LvW are you asking or saying!
    – Andy aka
    yesterday










  • @Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
    – LvW
    yesterday










  • @LvW it's always best to be careful!!
    – Andy aka
    yesterday













up vote
4
down vote



accepted







up vote
4
down vote



accepted






K4 produces amplification for AC signals whilst providing a DC amplification of 1 (so that DC levels are maintained from the InAmp output to whatever stage follows K4). It might also be used to share the burden of AC signal gain between InAmp and itself thus minimizing slew rate problems in the InAmp.






share|improve this answer












K4 produces amplification for AC signals whilst providing a DC amplification of 1 (so that DC levels are maintained from the InAmp output to whatever stage follows K4). It might also be used to share the burden of AC signal gain between InAmp and itself thus minimizing slew rate problems in the InAmp.







share|improve this answer












share|improve this answer



share|improve this answer










answered yesterday









Andy aka

237k10173405




237k10173405












  • thanks Andy for the quick reponse.
    – Michael Astahov
    yesterday










  • So - the last stage acts as a sort of highpass.
    – LvW
    yesterday










  • @LvW are you asking or saying!
    – Andy aka
    yesterday










  • @Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
    – LvW
    yesterday










  • @LvW it's always best to be careful!!
    – Andy aka
    yesterday


















  • thanks Andy for the quick reponse.
    – Michael Astahov
    yesterday










  • So - the last stage acts as a sort of highpass.
    – LvW
    yesterday










  • @LvW are you asking or saying!
    – Andy aka
    yesterday










  • @Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
    – LvW
    yesterday










  • @LvW it's always best to be careful!!
    – Andy aka
    yesterday
















thanks Andy for the quick reponse.
– Michael Astahov
yesterday




thanks Andy for the quick reponse.
– Michael Astahov
yesterday












So - the last stage acts as a sort of highpass.
– LvW
yesterday




So - the last stage acts as a sort of highpass.
– LvW
yesterday












@LvW are you asking or saying!
– Andy aka
yesterday




@LvW are you asking or saying!
– Andy aka
yesterday












@Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
– LvW
yesterday




@Andy aka...there is no question mark. Hence, it is not a question. To me, the transfer function [1+sR2C/(1+sR1C)] is a highpass with a fixed gain of unity at low frequencies. Why are you asking?
– LvW
yesterday












@LvW it's always best to be careful!!
– Andy aka
yesterday




@LvW it's always best to be careful!!
– Andy aka
yesterday










Michael Astahov is a new contributor. Be nice, and check out our Code of Conduct.










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Michael Astahov is a new contributor. Be nice, and check out our Code of Conduct.













Michael Astahov is a new contributor. Be nice, and check out our Code of Conduct.












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