What is Gm and how does it relate to op-amps?

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SUMMARY

The discussion centers on the concept of Gm, or transconductance, in relation to operational amplifiers (op-amps). Gm is defined as a gain multiplier with units of A/V, functioning as a voltage-controlled current source that converts input voltage into output current. The inquiry emphasizes the need for a clear understanding of Gm to utilize these values quantitatively in op-amp applications. The reference material cited is "Microelectronic Circuits" by Sedra and Smith, 6th Edition.

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  • Understanding of operational amplifier fundamentals
  • Familiarity with transconductance and its applications
  • Knowledge of voltage-controlled current sources
  • Basic concepts of gain in electronic circuits
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  • Research the role of transconductance in op-amp design
  • Study the characteristics and applications of voltage-controlled current sources
  • Explore gain calculations in operational amplifiers
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Electrical engineers, students studying electronics, and professionals working with operational amplifiers will benefit from this discussion, particularly those seeking to deepen their understanding of transconductance and its implications in circuit design.

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I have been given a question regarding op-amps. In the figure however, there are elements which have not been introduced nor explained in the chapter. Please refer to the attached image.

(Image taken from "Microelectronic Circuits",by Sedra and Smith, 6th Ed., page 58.)

In the figure there are statements beside each internal independent current source. What is "G_m"? Are these current sources supplying power needed by the op-amp? Perhaps it is a part of gain? Can it be related to A?

I do not know. Any detailed conceptual explanation would be greatly appreciated, as I need to be able to use these values quantitatively and confidently!

Thanks for your time and patience.
 

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LickMyEyeball said:
I have been given a question regarding op-amps. In the figure however, there are elements which have not been introduced nor explained in the chapter. Please refer to the attached image.

(Image taken from "Microelectronic Circuits",by Sedra and Smith, 6th Ed., page 58.)

In the figure there are statements beside each internal independent current source. What is "G_m"? Are these current sources supplying power needed by the op-amp? Perhaps it is a part of gain? Can it be related to A?

I do not know. Any detailed conceptual explanation would be greatly appreciated, as I need to be able to use these values quantitatively and confidently!

Thanks for your time and patience.

The G_m are gain multiplier values. They have units of A/V, so they take a voltage as an input, and give you current as an output. Those are "voltage controlled current sources".
 

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