Engineering Calculating Equilibrium Points in OVA-Opamp Circuit with Ideal Diodes

[Ander99]

Homework Statement

Determinate the equilibrium points of an OVA-Opamp circuit
Tell if this points are stable or not

Relevant Equations

Kirchhof's Laws

Hi everyone, I need help with this exercise becouse I don't know how to calculate the equilibrium points of a circuit. The original exersice is the following:
Assume that the open loop dynamic response of the OVA-opamp gets captured by Fig. 1(a) and
consider the circuit of Fig. 1(b).
Consider first that vs =0
Replace the opamp in Fig. 1(b) by the model of Fig. 1(a) with ideal diodes. Obtain the driving-
point characteristics seen by the capacitor . Provide justified answers to
the following questions:
• How many equilibrium points has the circuit?
• Which of these equilibrium points are stable, and which are unstable?

I have attached a file with the representation of the circuits.
Thank you very much, everyone.

 

[berkeman]

Homework Statement:: Determinate the equilibrium points of an OVA-Opamp circuit
Tell if this points are stable or not
Relevant Equations:: Kirchhof's Laws

Hi everyone, I need help with this exercise becouse I don't know how to calculate the equilibrium points of a circuit. The original exersice is the following:
Assume that the open loop dynamic response of the OVA-opamp gets captured by Fig. 1(a) and
consider the circuit of Fig. 1(b).
Consider first that vs =0
Replace the opamp in Fig. 1(b) by the model of Fig. 1(a) with ideal diodes. Obtain the driving-
point characteristics seen by the capacitor . Provide justified answers to
the following questions:
• How many equilibrium points has the circuit?
• Which of these equilibrium points are stable, and which are unstable?

I have attached a file with the representation of the circuits.
Thank you very much, everyone.

Welcome to PhysicsForums.

What's an OVA?

And it looks like the circuit is wired as a positive-feedback comparator, not a negative feedback opamp. Where is $V_s$ being generated? (the - input voltage to the comparator)

 

[Ander99]

[QUOTE = "berkeman, publicación: 6418425, miembro: 8921"]
Bienvenido a PhysicsForums. :sonrisa:

¿Qué es un OVA?

Y parece que el circuito está cableado como un comparador de retroalimentación positiva, no como un opamp de retroalimentación negativa. ¿Dónde se genera $V_s$? (el - voltaje de entrada al comparador)
[/quote]
I don't have that information about $V_s$ but I think it has a constant value which is 0, anyway.