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What kind of opamp is that ?

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wael_wael

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hi,
could some one till me what is the kind of this opamp, it used for gain boosting op amp.
regards
 

rowokii

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op amp question

Both circuits are common source amplifier. They are used at times, as the output stage of two stage amplifier.
 

    wael_wael

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wael_wael

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Re: op amp question

rowokii said:
Both circuits are common source amplifier. They are used at times, as the output stage of two stage amplifier.
but in the paper mentioned that is inverter
 

kivvzhou

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op amp question

yes,it's a common source amplifier.it's also a inverter.you must understand that inverter is also a amplifer,it's classB amplifier.note:if v2 and in tied together it is a inverter.
 

    wael_wael

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wael_wael

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Re: op amp question

thank you so much for ur help, but which way i use to design it, inverter or common source.
regards
 

pfd001

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op amp question

you can design common source
 

    wael_wael

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wael_wael

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Re: op amp question

pfd001 said:
you can design common source
thank u but i think is current source inverter which is the target now, but how ??
 

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op amp question

Hi
you mus find your challenges.
they may be bandwidth, gain and bias in gain boosting.
because of negative gain, this amplifier was named inverter too.
regards
 

    wael_wael

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analog_prodigy

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op amp question

i think, in digital signal mode it works as an inverter (input 0 => output 1; input 1 => output 0). if u want the same circuit in analog signal mode operation, it will be a common source amplifier. In digital mode u no need to worry otherthan speed (load capacitance), but in analog mode operation u should take care of somany things as explained gain, ugb etc...
 

    wael_wael

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Sadegh.j

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Re: op amp question

The gain of both circuits is gm*ro/2. The transconductance is different though.
 

    wael_wael

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pmr9

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Re: op amp question

Its the senario u r using this ckt for digital or analog application. Certnly its output bufer stage bcoz of high sizes and CS config. Csink and source txs are having high Gm s if u see it .
 

    wael_wael

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ameed

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Re: op amp question

hi,

yes,it's a common source amplifier.it's also a inverter.

you must understand that inverter is also a amplifer,

it's classB amplifier.note:if v2 and in tied together it is a inverter.


thanx.
 

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Re: op amp question

wael_wael said:
hi,
could some one till me what is the kind of this opamp, it used for gain boosting op amp.
regards


These are not OPAMPs.
They are common-cource amplifiers.

Could you provide the schematic of your gain-boosting OP?
 

rameshabng

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Re: op amp question

it is the second stage of an opamp in general used for the increasing the overall gain of opamp although it is not only the case for gainboosting
 

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