I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB.

The circuit is this. The input dc level is 0.6 V, which is the problem. DC level of Vout is 0.1 V. When I change the input DC level, the graph becomes more reasonable.

What to say about the phase margin in this situation?

UPDATE

I am allowed to change input DC level now, and changed it to 0.55 V. Output DC level is 0.15 V. I measured the phase margin as ~171°.

I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB.

The circuit is this. The input DC level is 0.6 V, which is the problem. When I change the input DC level, the graph becomes more reasonable. But I need it to be 0.6 V.

What to say about the phase margin in this situation?

UPDATE

I am allowed to change input DC level now, and changed it to 0.55 V. Output DC level is 0.15 V. I measured the phase margin as ~171°.

Update 2: Further investigation of the circuit

Circuit with an inductor connected between Vin and Vout:

Its bode plot:

Circuit with a capacitor before the input:

Its bode plot:

I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB.

The circuit is this. The input dc level is 0.6 V, which is the problem. DC level of Vout is 0.1 V. When I change the input DC level, the graph becomes more reasonable.

What to say about the phase margin in this situation?

UPDATE

I am allowed to change input DC level now, and changed it to 0.55 V. Output DC level is 0.15 V. I measured the phase margin as ~171°.

I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB.

The circuit is this. The input dc level is 0.6 V, which is the problem. DC level of Vout is 0.1 V. When I change the input DC level, the graph becomes more reasonable.

What to say about the phase margin in this situation?

UPDATE

I am allowed to change input DC level now, and changed it to 0.55 V. Output DC level is 0.15 V. I measured the phase margin as ~171°.

I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB!

The circuit is this. The input dc level is 0.6V, which is the problem. DC level of Vout is 0.1V. When I change the input dc level, graph becomes more reasonable.

What to say about phase margin in this situation? Thanks in advance!

UPDATE

I am allowed to change input DC level now, and changed it to 0.55V. Output DC level is 0.15V. I measured the phase margin as ~171 degrees.

I have a graph that looks like this. I am tasked to measure the phase margin, but the graph doesn't exceed 0 dB.

The circuit is this. The input dc level is 0.6 V, which is the problem. DC level of Vout is 0.1 V. When I change the input DC level, the graph becomes more reasonable.

What to say about the phase margin in this situation?

UPDATE

I am allowed to change input DC level now, and changed it to 0.55 V. Output DC level is 0.15 V. I measured the phase margin as ~171°.