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Cascading_OPAMPs.php   6971 Bytes    08-08-2015 19:01:56


Cascading OPAMPs For Increased Bandwidth



The Bandwidth of an Operational Amplifier Circuit quickly drops when "some gain" is needed. To overcome this, opamps in series may help to increase the overall Bandwidth. This tools shows you the interrelation between number of amplifiers, GBWP, overall Bandwidth and overall Gain.


Cascading OPAMPs

A three stage design lowers the GBWP by a factor of ~ 11 compared to a single stage design.



Desired Bandwidth

   

[kHz]

Desired Gain

   

[V/V]

Number of OPAMPs

   

   

Necessary GBWP per OPAMP

[MHz]

Gain per stage

[V/V]





All stages assumed to be identical.





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t1 = 3844 d

t2 = 310 ms

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