Value of Vout in PMOS Inverter?

In summary, a PMOS inverter is a logic gate used to convert a logic signal from one level to another. Its output, Vout, is determined by the input voltage, threshold voltage of the PMOS transistor, and load resistance. The relationship between Vout and Vin is inverse, and Vout can be affected by varying the load resistance. Factors such as temperature, supply voltage, and manufacturing process variations can also impact the accuracy of Vout in a PMOS inverter.
  • #1
jean28
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0
Hey guys. I am simply trying to derive the equation for Vout in a PMOS inverter (attached). I know that in an NMOS inverter (which has the resistor in top of the transistor instead of the bottom) the equation for Vout is:

Vdd - id*rd.

But how does the resistor being in the bottom change this behavior? Is it now Vcc - ground? (which would equal Vcc).

Thanks.
 

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  • #2
It could also be Vout = id * Rd.
 
  • #3
jean28 said:
It could also be Vout = id * Rd.
If by Rd you mean that external resistor, then that looks right for output logic HIGH.
 

1. What is the purpose of a PMOS inverter?

A PMOS inverter is a type of logic gate that is used in digital circuits to convert a logic signal from one logic level to another. It is commonly used in logic circuits as an inverter, which is a gate that produces an output signal that is the opposite of the input signal.

2. How is the value of Vout determined in a PMOS inverter?

The value of Vout in a PMOS inverter is determined by the input voltage, the threshold voltage of the PMOS transistor, and the load resistance. The PMOS transistor is turned on when the input voltage is low, which pulls Vout to a high voltage level. When the input voltage is high, the PMOS transistor is turned off, allowing Vout to be pulled down to a low voltage level through the load resistance.

3. What is the relationship between Vout and Vin in a PMOS inverter?

The relationship between Vout and Vin in a PMOS inverter is inverse. This means that when Vin is low, Vout is high and when Vin is high, Vout is low. This relationship is due to the behavior of the PMOS transistor, which acts as a switch to control the output voltage based on the input voltage.

4. How does the value of Vout change when the load resistance is varied in a PMOS inverter?

The value of Vout in a PMOS inverter is affected by the load resistance. A higher load resistance will result in a slower rise and fall time of Vout, as the PMOS transistor has to work harder to overcome the resistance and change the output voltage. On the other hand, a lower load resistance will result in a faster rise and fall time of Vout.

5. What are some factors that can affect the accuracy of Vout in a PMOS inverter?

There are several factors that can affect the accuracy of Vout in a PMOS inverter, including temperature, supply voltage, and manufacturing process variations. These factors can cause variations in the threshold voltage of the PMOS transistor, which in turn can affect the output voltage of the inverter. Additionally, variations in the load resistance and input voltage can also impact the accuracy of Vout.

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