Voltage Divider Equation: TTL Circuit Analysis

In summary, the circuit shown is not a TTL circuit, but rather an emitter-follower circuit. To calculate the value of Vout, you need to assume a Beta for the transistor and use equations for the base and collector currents, taking into account the Vbe drop. It's important to remember that the emitter current is the sum of the collector and base currents.
  • #1
ravenprp
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http://img153.imageshack.us/img153/9007/untitledvb8.png [Broken]

That is my TTL circuit. I forgot to add +5v and a circle at the top of the diagram, so pretend it's there.

Do I have to use the voltage divider equation to get the value of Vout?

(5v)(Rl)/ (Rl + Rc) where Rl = 1kohm, Rc = 100kohm?
 
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  • #2
Not exactly. You need to assume some Beta for the transistor, then write the equations for the base and collector currents, assuming some number for the Vbe drop. Remember that the emitter current is Ic + Ib (it's easy to forget that small adjustment and assume that Ie = Ic).

BTW, this is not a TTL circuit. It is an emitter-follower circuit as you have drawn it. The emitter voltage follows the base voltage, minus the Vbe drop.
 
  • #3


Yes, you can use the voltage divider equation to calculate the value of Vout in this TTL circuit. The voltage divider equation states that the output voltage (Vout) is equal to the input voltage (Vin) multiplied by the ratio of the two resistors in the circuit (Rl and Rc). In this case, Vout = Vin * (Rl / (Rl + Rc)). Plugging in the values for Rl and Rc, we get Vout = 5V * (1kohm / (1kohm + 100kohm)) = 0.0495V. However, please note that this calculation assumes ideal conditions and may not be entirely accurate in a real circuit due to factors such as tolerances in resistor values and variations in power supply voltage. It is always best to double check your calculations and use a multimeter to measure the actual value of Vout in a real circuit.
 

1. What is the voltage divider equation?

The voltage divider equation is a mathematical formula that is used to calculate the output voltage of a circuit with resistors in series. It is typically used in TTL (transistor-transistor logic) circuits to determine the voltage at a specific point in the circuit.

2. How is the voltage divider equation derived?

The voltage divider equation is derived from Ohm's Law, which states that the current flowing through a conductor is directly proportional to the voltage and inversely proportional to the resistance. By rearranging this equation, we can calculate the output voltage of a circuit with resistors in series.

3. What is the significance of the voltage divider equation in TTL circuit analysis?

The voltage divider equation is significant in TTL circuit analysis because it allows us to predict the output voltage of a circuit, which is essential for understanding the behavior of the circuit and troubleshooting any issues that may arise. It also helps us determine the values of resistors needed to achieve a specific output voltage.

4. Can the voltage divider equation be applied to circuits with other components besides resistors?

Yes, the voltage divider equation can be applied to circuits with other components, such as capacitors and inductors, as long as they are in series with resistors. However, the equation may need to be modified slightly to account for the different characteristics of these components.

5. Are there any limitations to using the voltage divider equation in TTL circuit analysis?

While the voltage divider equation is a useful tool in TTL circuit analysis, there are some limitations to its application. It assumes that the resistors in the circuit are ideal and that there is no current leakage. In reality, there may be some deviations from these assumptions, which can affect the accuracy of the calculated output voltage.

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