Hello!
I want to do impedance measurement on some sample using a 3 electrode configuration, DACs and ADCs. I was thinking of using a dual phase lock in amplifier to get the resistive and reactive parts of the signal. Everything will be controlled by a microcontroller (uC).
I was thinking of using a DDS (e.g. AD9850) for sine wave excitation (as it is better since the DAC on the uC has max. 1MSPS).
Does this sound like the way to go? Any suggestions on better/alternative solutions?
What I need help with if the chosen solution above stands is how to do the analog circuit design from the DDS output to the uC/uCADC.
I am currently stuck and have been searching google for many many hours so any help that can point me in the right direction or if someone wants to try draw some basic circuit/block diagram, it would be much appreciated!
Thank you in advance =)
I want to do impedance measurement on some sample using a 3 electrode configuration, DACs and ADCs. I was thinking of using a dual phase lock in amplifier to get the resistive and reactive parts of the signal. Everything will be controlled by a microcontroller (uC).
I was thinking of using a DDS (e.g. AD9850) for sine wave excitation (as it is better since the DAC on the uC has max. 1MSPS).
Does this sound like the way to go? Any suggestions on better/alternative solutions?
What I need help with if the chosen solution above stands is how to do the analog circuit design from the DDS output to the uC/uCADC.
I am currently stuck and have been searching google for many many hours so any help that can point me in the right direction or if someone wants to try draw some basic circuit/block diagram, it would be much appreciated!
Thank you in advance =)