# Differential Amplifier - Differential Mode

Discussion in 'Electronics Homework Help' started by EEM, Jun 25, 2016.

1. ### EEM

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Jun 25, 2016
Hello, I am hoping someone could help me with part B of this problem. I am not sure of the effects the resistor would have on the differential output gain.
Also I have attached my solution to part A but I am uncertain if I derived it correctly.

Any help would be appreciated !

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2. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
is there a minimum and maximum current through Rc?

3. ### EEM

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Jun 25, 2016
No, there was none specified

4. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
look at the circuit with that question in mind.

perhaps you could consider the minimum current through either Rc and the output voltage in that case.

As the current through Rc increases what happens to the output voltage? What effect would a low vs high value resistor have?

the answer to this question should be pretty intuitive

5. ### EEM

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Jun 25, 2016
To me it would make sense that the higher value the added resistor is, then the smaller the differential output gain.
I've attached a proof for my understanding of part b. Does this look OK ?

6. ### (*steve*)¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥdModerator

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Jan 21, 2010
Does that mean that if the resistors were a minimum (i.e. both outputs tied to Vcc) that the gain would be at a maximum?

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Apr 12, 2014