Hello, good day all.
I am attempting to build an impedance meter capable of conducting a frequency sweep of up to 25MHz on a DUT ( i have no clue what the Z is, but the physical property is a liquid). I intend on injecting a sine wave, a triangle wave and a square wave into the DUT; one at a time to characterize the DUT at the range of frequencies for each waveform. I will be using the AD5930 (the waveform generator IC) which has a peak to peak output of 0.56V, can output a maximum of 4mA and able to perform a frequency sweep up to 25MHz.
The set up i am going to use is the auto-balancing bridge method. More information could be found on http://cp.literature.agilent.com/litweb/pdf/5950-3000.pdf concerning the auto-balancing bridge from page 24 onwards (picture below shows the design). I can build the circuitry and I can use a diff amp to obtain the magnitude of the voltage. This would only yield the magnitude of the impedance of the DUT. My concern is developing the circuitry to measure the phase of the impedance of the DUT at the particular frequencies. Any help? any IC reccomendations?
Thank You.
I am attempting to build an impedance meter capable of conducting a frequency sweep of up to 25MHz on a DUT ( i have no clue what the Z is, but the physical property is a liquid). I intend on injecting a sine wave, a triangle wave and a square wave into the DUT; one at a time to characterize the DUT at the range of frequencies for each waveform. I will be using the AD5930 (the waveform generator IC) which has a peak to peak output of 0.56V, can output a maximum of 4mA and able to perform a frequency sweep up to 25MHz.
The set up i am going to use is the auto-balancing bridge method. More information could be found on http://cp.literature.agilent.com/litweb/pdf/5950-3000.pdf concerning the auto-balancing bridge from page 24 onwards (picture below shows the design). I can build the circuitry and I can use a diff amp to obtain the magnitude of the voltage. This would only yield the magnitude of the impedance of the DUT. My concern is developing the circuitry to measure the phase of the impedance of the DUT at the particular frequencies. Any help? any IC reccomendations?
Thank You.