Second order butterworth high pass filter design.

Thread Starter

Alex_Khan

Joined May 27, 2020
60
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
 

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Papabravo

Joined Feb 24, 2006
19,608
IMHO a Sisyphean task. You need a better amplifier and a tutorial on why lumped components are inappropriate for VHF designs. In this part of the RF spectrum, it is not uncommon for inductors to behave like capacitors and capacitors to behave like inductors. You should familiarize yourself with microstripline techniques.
 
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