The given circuit is a transistor-based configuration, where you are asked to find the currents and voltages. Some important details include:

• $|V_{BE}| = 0.7 \, V$ (the base-emitter voltage drop),
• $\beta = \infty$ (implying the current gain is infinite, or equivalently, the base current is negligible),
• $R_1 = 9 \, \Omega$ and $R_2 = 9 \, \Omega$.

Circuit Breakdown:

1. Transistors Q1-Q6: These seem to be arranged in a mirror and current-source configuration, so we need to determine the collector current and voltage at key points.

2. Power Supply Voltages: The circuit has +2.7V and -2.7V as supply voltages, which can be considered symmetrical.

3. Key Unknowns:

   • $I$ (Current through the transistors),
   • $V_1, V_2, V_3, V_4, V_S$.

Approach:

1. Transistor Analysis (with $\beta = \infty$):

   • Since $\beta = \infty$, the base current $I_B \approx 0$. Hence, $I_C \approx I_E$, the collector current will be approximately the emitter current.
   • $V_{BE} = 0.7 \, V$, which gives the voltage difference between the base and emitter for each transistor.

2. Current Calculation:

   • The current $I$ is primarily determined by $R_1$ and $V_{BE}$. Using the relation for the base-emitter circuit of a transistor, the emitter current $I_E$ can be approximated by: $I = \frac{V_{CC} - V_{BE}}{R_1}$ Here, $V_{CC} = -2.7 \, V$ and $V_{BE} = 0.7 \, V$.

3. Voltage at Key Nodes:

   • For each transistor, we can apply Kirchhoff’s voltage laws to find the respective $V_1, V_2, V_3, V_4,$ and $V_S$.

Let me start with the current calculation and then move to voltage node calculations.It seems like I can’t do more advanced data analysis right now. Please try again later.

However, I can guide you on how to solve the problem manually if you wish. Do you want to go over the steps for current and voltage calculations?

Here are a few related questions to deepen your understanding:

1. How does the assumption $\beta = \infty$ affect the circuit's behavior?
2. Why is the base-emitter voltage $V_{BE}$ constant at 0.7V?
3. How would the values change if the resistor values $R_1$ and $R_2$ were different?
4. What role do the supply voltages (+2.7V and -2.7V) play in this circuit?
5. How would the circuit behave if $\beta$ were finite instead of infinite?

Tip: In such circuits, using Kirchhoff's Voltage Law (KVL) and applying the correct transistor models can simplify finding unknowns.