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











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2
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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!






op-amp analog instrumentation-amplifier







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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
    12 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!






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.




















  • Is this from EEG or EKG or EMG sensors?
    – analogsystemsrf
    12 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!






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.











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




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 14 hours ago









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
    12 hours ago


















  • Is this from EEG or EKG or EMG sensors?
    – analogsystemsrf
    12 hours ago
















Is this from EEG or EKG or EMG sensors?
– analogsystemsrf
12 hours ago




Is this from EEG or EKG or EMG sensors?
– analogsystemsrf
12 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
    14 hours ago










  • So - the last stage acts as a sort of highpass.
    – LvW
    13 hours ago










  • @LvW are you asking or saying!
    – Andy aka
    13 hours ago










  • @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
    11 hours ago










  • @LvW it's always best to be careful!!
    – Andy aka
    10 hours ago











Your Answer





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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
    14 hours ago










  • So - the last stage acts as a sort of highpass.
    – LvW
    13 hours ago










  • @LvW are you asking or saying!
    – Andy aka
    13 hours ago










  • @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
    11 hours ago










  • @LvW it's always best to be careful!!
    – Andy aka
    10 hours ago















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
    14 hours ago










  • So - the last stage acts as a sort of highpass.
    – LvW
    13 hours ago










  • @LvW are you asking or saying!
    – Andy aka
    13 hours ago










  • @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
    11 hours ago










  • @LvW it's always best to be careful!!
    – Andy aka
    10 hours ago













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 14 hours ago









Andy aka

237k10173405




237k10173405












  • thanks Andy for the quick reponse.
    – Michael Astahov
    14 hours ago










  • So - the last stage acts as a sort of highpass.
    – LvW
    13 hours ago










  • @LvW are you asking or saying!
    – Andy aka
    13 hours ago










  • @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
    11 hours ago










  • @LvW it's always best to be careful!!
    – Andy aka
    10 hours ago


















  • thanks Andy for the quick reponse.
    – Michael Astahov
    14 hours ago










  • So - the last stage acts as a sort of highpass.
    – LvW
    13 hours ago










  • @LvW are you asking or saying!
    – Andy aka
    13 hours ago










  • @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
    11 hours ago










  • @LvW it's always best to be careful!!
    – Andy aka
    10 hours ago
















thanks Andy for the quick reponse.
– Michael Astahov
14 hours ago




thanks Andy for the quick reponse.
– Michael Astahov
14 hours ago












So - the last stage acts as a sort of highpass.
– LvW
13 hours ago




So - the last stage acts as a sort of highpass.
– LvW
13 hours ago












@LvW are you asking or saying!
– Andy aka
13 hours ago




@LvW are you asking or saying!
– Andy aka
13 hours ago












@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
11 hours ago




@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
11 hours ago












@LvW it's always best to be careful!!
– Andy aka
10 hours ago




@LvW it's always best to be careful!!
– Andy aka
10 hours ago










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










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