Sequential (131) Differential pair

https://chihaukam.blogspot.com/2023/10/1-daniel-should-tell-chinese-spy-that.html

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Ref.https://chihaukam.blogspot.com/2024/11/blog-post.html?m=1.

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John : See the 1st Picture above.  The current mirror is used to amplify the signal. The differential pair is used to calculate the difference between (+) and (-).

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Me: If (+) and (-) are also 2Voltage, the Output is 0 Voltage. 

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John : Yes, now see the 2nd picture.  It's an operational amplifier.  However,  it has 2 output.  

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Me: At the same time  it has 2 output.

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John: We call that double in/out Operational amplifier.