ahmedatef0
Junior Member level 1
I have an assignment to make a Gm-C low pass filter with a cut-off frequency of 0.8GHz. So I think as a rule of thumb the Gm-Cell should have a bandwidth of 8GHz (10*cut-off freq.)
My question is how do I make a Gm-cell? Is it like building an OTA? I've made OTAs before they never had this large bandwidth, in the OTA the output node had very large impedance thus it had a very small dominant pole so how will I get this BW, and If I decreased Rout the OTA will not act as an ideal current source.
It's also required that the filter should e DC coupled I don't know how to do this as well.
If anybody can help me understand the points that confuses me or can send me resources to understand better I would be very grateful.
My question is how do I make a Gm-cell? Is it like building an OTA? I've made OTAs before they never had this large bandwidth, in the OTA the output node had very large impedance thus it had a very small dominant pole so how will I get this BW, and If I decreased Rout the OTA will not act as an ideal current source.
It's also required that the filter should e DC coupled I don't know how to do this as well.
If anybody can help me understand the points that confuses me or can send me resources to understand better I would be very grateful.