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Transimpedance amplifier or transconductance amplifier for filter design for low freq

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simplsoft

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Hello

I want to know for continuous time filters mostly OTA-C filters are used but why not OTRA (Operational transresistance amplifier) ? especially for low frequency applications(biomedical) OTRA are not used why?Is there some complexity issue? similarly op-amps are also not preferred.

Can some one help me in this matter.
 

simplsoft said:
especially for low frequency applications(biomedical) OTRA are not used why?Is there some complexity issue?
Click to expand...

Instead of wondering why OTA are not used in biometric applications, you oppositely should ask yourself why Operational Amplifiers are used. In general, measured signals from the human body are extremely weak, having a very low voltage, and obviously due to the high "resistivity" of the human body, there is associated to it a very high "output" impedance. In such cases, any amplifier with very high input impedance would be the suited option.
 

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