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How to increase the unity gain bandwidth of a single stage differential opamp?

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analog_adam

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Hi Guys;

I am designing a single stage differential opamp with no cascodes. I currently obtained a unity gain bandwith of 1.25 GHz with 0.18 CMOS process. However, I need to increase this value up to 6-7 GHz. Do you guys know how to increase the unity gain bandwidth of a single stage differential opamp? Thanks for help.
 

Re: Unity Gain Bandwidth

increase gm
 

Re: Unity Gain Bandwidth

Generally with higher current you can achieve better GBW until you come to some limit.
 

Unity Gain Bandwidth

GBW equal gm/C so increasing gm and decreasing the o/p cap.

note gm icrease by increasing current and keeping the Veff minimum but keeping it minimum comes by increasing W/L which increase area and hence cap. so optimize.

Added after 56 seconds:

note i considered active loads to neglect the o/p resistance (i.e. ro of th load euqal ro of the diff. pair)
 

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