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Design >> Analog Design >> Noise Reductin in Gm-C Low-Pass Filter
https://designers-guide.org/forum/YaBB.pl?num=1110250188

Message started by nicole on Mar 7^th, 2005, 6:49pm

Title: Noise Reductin in Gm-C Low-Pass Filter
Post by nicole on Mar 7^th, 2005, 6:49pm

Dear all,

These days I am doing the Gm-C LPF design, the spec is as following: center frequency=133KHz, BW=233KHz(0.5dB loss), @467KHz=-72dBc, 1dB ripple in passband, NF<=35dB, Gain<=10dB.

I used 8-order ChebyshevI LPF and simulation results shows it met the above specs except NF. The NF of my circuit is about 60dB. I did not know how to reduce it.