JondorZ Posted February 10, 2011 Report Share Posted February 10, 2011 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 CMOSI 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! Quote Link to comment Share on other sites More sharing options...
audioguru Posted February 10, 2011 Report Share Posted February 10, 2011 I have always used Sallen and Key for lowpass and highpass filters. Quote Link to comment Share on other sites More sharing options...
kbyrne Posted April 10, 2012 Report Share Posted April 10, 2012 From a newbi to this post there is a freeware and paid program called FilterWiz. It has what is mentioned here plus all opamp choices ect with necessary parameters. Quote Link to comment Share on other sites More sharing options...
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