lhlbluesky_lhl
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i want to design a active bandpass filter, Q>10, center frequency f0=20KHz, stop band attenuation as large as possible, and use as small as possible external components, and only one off-chip component is allowed (a R or a C), the other components to be on-chip, what type of BPF can i use? in my opinion, i want to design a two-order BPF, but as i know, f0 is usually decided by at least two R and two C, such as f0=1/(sqrt(C1*C2*R1*R2)*2*pi), so if i use only a R or a C to tune the f0, the linearity is not better. besides, the opamp non-ideal characteristics can have much influence on the BPF performance. so, how to consider this or how to design the opamp parameters (such as DC gain, GBW, PM, etc). thanks all.
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