Butterworth 2nd order HPF

[Alex_bam]

Hello,
Could anyone review my 2nd order Butterworth HPF design? I have mentioned design details along with schematics and initial results.

Design specifications for 2nd HPF: Cutoff frequency= 100Mhz, Design method: by considering equal component, Input signal= 10V,120MHz, sinosidal.

Design specification for OPAMP: Slew rate= 5V/usec , CL=10pF, ICMR+= 4.5V, ICMR-=1.5V , Vdd=5V, GBW>=5MHz, W/L ratio is mentioned with each transistor.

According to the calculations, it should work but I do not know where I am making mistakes...

Thanks

 

[danadak]

Something really amiss if you are doing this at 100 Mhz with 5 Mhz GBW G elements ?
Same comment applies to G element slew rate of only 5V / microsecond. That does not
jive with :

What am I missing here ?


Regards, Dana.

 

[JimB]

I do not know where I am making mistakes...

You seem to be trying to use an audio frequency filter at 100MHz.
You are trying to use an opamp with a 5MHz gain bandwidth at 100MHz.

It is usual practice to make RF filters using inductors and capacitors, not opamps and transistors.

JimB