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Low-Voltage Differential Amplifier

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Electrokid

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I'm looking for a little help here.
I have a CMOS class where we got assigned a project last minute...
I need to design a low-voltage differential amplifier, then using that build a comparator.

The project is only to be simulated in LTSpice.

"Low-voltage" as my prof. means it is Vdd must be between .2 - 1 Volts.
It also has to have a gain of at least 5.

Any help would be appreciated... I don't really know where to start... at all.
Been doing some Google searches but have so far come up with nothing.

I've attached the project outline.

Any help would be greatly appreciated.

Thanks!!!


photo (1).JPG
 

I guess, the problem is referring to CMOS differential amplifier toplogies that have been presented in the course. Otherwise analog CMOS design text books like Razavi should give you an idea. The low voltage requirement restricts of course the circuit choice.
 

Alrighty... so I'm going a little nutty over here.
I still can't get a low-voltage differential amp working properly...

It needs to have a gain of at least 5... and I'm shooting for using Vdd between .2 - .4 volts.
I can use more than 1 stage to achieve the gain, so as long as I get a gain of more than 1 (in 1 stage), I can cascade as many as may be needed to achieve an overall gain of 5. The highest gain I've been able to achieve is .73

The differential amp must use this model file for the MOSFETS:
**broken link removed**

Any topology is allowed.

The only design stipulation is that ONLY mosfets can be used... no resistors, caps, etc...


Can anyone help me out?

That model file again: **broken link removed**

Thanks.
 

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