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Need help in 4th-Order Source Follower Lowpass Filter design


JondorZ

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Hi there,

I have a project to design a 4th-order source follower lowpass filter for medical applications. Here are the specifications:

  1. Supply Voltage: 2.5V
  2. Filter order: 4th-Order
  3. Cutoff Frequency: 3kHz, 5kHz, 8kHz, 10kHz programmable
  4. Power Consumption: <2mW
  5. Design Tech: 0.35um CMOS


I am using Cadence Virtuoso to design and simulate the circuit. I am designing the internal circuit of the opamp using NMOS and PMOS transistors. So I use the biquad design and it doesn't seem to be working. I need help in whether the biquad design is suitable or there is other better circuit design. Thanks a lot!

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