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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
 

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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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
 

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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Re: op amp question

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

op amp question

you can design common source
 

    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 ??
 

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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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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Re: op amp question

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

    wael_wael

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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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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.
 

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?
 

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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