I have the following bode plot and nyquist plot result of an unknown DUT (it is a filter I asume!).
I wonder what kind of arrangement it has in terms of being a series or parallel RC or RLC network.
Since the top left plot starts at 500 and to the middle of the frequency it reaches the minimum, I assume there is a resistor involved.
Also because there is no so called half-circle in the nyquist diagram I assume there is no capacitor in the circuit.
The phase shift from -90 to +90 in the lower left graph makes my head scratchy!
What could be the circuit for this graph?