# Vss Vs Vdd

Introduction:

In the world of electronics, voltage is an important concept that is used in various applications. It is used for powering a circuit, controlling switches, or to sense any changes in a circuit. There are two types of voltage supplies that are commonly used in electronics: Vss and Vdd. In this article, we will be discussing the difference between Vss and Vdd.

Vss:

Vss stands for “Voltage Source Supply”. It is the negative power supply that is used to power up logic circuits in electronic devices. It is always less than Vdd, which is the positive power supply. The voltage of Vss varies depending on the type of device but is typically around -5V to -15V.

The main function of Vss is to provide a negative reference voltage for the internal circuitry of electronic devices. It is also used to control signal levels in some devices. In digital circuits, the Vss pin is labeled as Ground (GND), and it is connected to the ground plane of the circuit.

Vdd:

Vdd stands for “Voltage Drain Drain”. It is the positive power supply that is used to power up logic circuits in electronic devices. It is always greater than Vss. The voltage of Vdd varies depending on the type of device but is typically around 5V to 15V.

The main function of Vdd is to provide a positive reference voltage for the internal circuitry of electronic devices. In digital circuits, the Vdd pin is labeled as Vcc, and it is connected to the power supply of the circuit.

Comparison between Vss and Vdd:

1. Polarity:

The main difference between Vss and Vdd is their polarity. Vss is the negative power supply while Vdd is the positive power supply. In electronic devices, the Vss pin is labeled as Ground (GND), and the Vdd pin is labeled as Vcc.

2. Voltage level:

The voltage level of Vdd is always higher than Vss. The voltage of Vdd varies between 5V to 15V, while the voltage of Vss varies between -5V to -15V.

3. Function:

The main function of Vss is to provide a negative reference voltage for the internal circuitry of electronic devices. It is also used to control signal levels in some devices. On the other hand, the main function of Vdd is to provide a positive reference voltage for the internal circuitry of electronic devices.

FAQs:

1. Can Vss and Vdd be connected to each other?

No, Vss and Vdd cannot be connected to each other directly. If they are connected to each other, it will cause a short circuit, which can damage electronic devices.

2. What is the significance of Vss and Vdd in electronics?

Vss and Vdd are important because they provide the necessary voltage levels for powering up the internal circuitry of electronic devices. They also serve as a reference voltage for signals in the circuit.

3. Why is Vdd always greater than Vss?

The reason why Vdd is always greater than Vss is because the internal circuitry of electronic devices requires a positive voltage reference. Also, most electronic devices use a positive logic system, which means that logic 1 is represented by a positive voltage, and logic 0 is represented by a negative voltage.

Conclusion:

In conclusion, Vss and Vdd are two types of power supplies that are commonly used in electronics. Their main difference is their polarity and voltage level. Vss is the negative power supply and provides a negative voltage reference for the internal circuitry of electronic devices. On the other hand, Vdd is the positive power supply and provides a positive voltage reference for the internal circuitry of electronic devices. Both Vss and Vdd are important for the proper functioning of electronic devices.