Junus2012
Advanced Member level 5
Dear friends,
Through my study for the filter design, I found nice document by texas instrument shown below
In figure 29 they give an example óf designing a low pass filter with fc = 1 MHz. The passive elements used to construct the active filters is very big like using capacitors in size of 220 PF and 100 PF.
I wonder how the op-amp is able to drive such big values with GBW that should be sufficient, The op-amp used for this design is THS4141 that has 160 MHz, but the company didn't specifiy the capacitive load for this test.
Thank you very much
Through my study for the filter design, I found nice document by texas instrument shown below
In figure 29 they give an example óf designing a low pass filter with fc = 1 MHz. The passive elements used to construct the active filters is very big like using capacitors in size of 220 PF and 100 PF.
I wonder how the op-amp is able to drive such big values with GBW that should be sufficient, The op-amp used for this design is THS4141 that has 160 MHz, but the company didn't specifiy the capacitive load for this test.
Thank you very much