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!

asked yesterday

Michael Astahov

132

New contributor

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

add a comment |

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!

asked yesterday

Michael Astahov

132

New contributor

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

add a comment |

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!

asked yesterday

Michael Astahov

132

New contributor

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

asked yesterday

Michael Astahov

132

New contributor

asked yesterday

Michael Astahov

132

New contributor

asked yesterday

Michael Astahov

132

New contributor

asked yesterday

Michael Astahov

132

asked yesterday

Michael Astahov

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.

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

add a comment |

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

add a comment |

1 Answer
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votes

up vote
4
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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.

answered yesterday

Andy aka

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

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

up vote
4
down vote

accepted

answered yesterday

Andy aka

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

add a comment |

up vote
4
down vote

accepted

answered yesterday

Andy aka

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

add a comment |

up vote
4
down vote

accepted

answered yesterday

Andy aka

237k10173405

answered yesterday

Andy aka

237k10173405

answered yesterday

Andy aka

237k10173405

answered yesterday

Andy aka

237k10173405

answered yesterday

Andy aka

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

add a comment |

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

add a comment |

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

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