The Drain Voltage Calculator helps in determining the drain-to-source voltage (VDS) in a field-effect transistor (FET) circuit. It calculates the voltage drop across the transistor's drain and source terminals based on the given supply voltage, drain current, and resistance values. This calculation is essential for designing and analyzing electronic circuits, ensuring proper voltage levels and circuit performance.
Formula of Drain Voltage Calculator
Drain Voltage (VDS) is calculated using the following formula:
VDS = VDD - ID × (RD + RS)
Where: VDS = Drain-to-source voltage (V)
VDD = Supply voltage (V)
ID = Drain current (A)
RD = Drain resistance (Ω)
RS = Source resistance (Ω)
Pre-calculated Values Table
This table provides pre-calculated drain voltage values for commonly used parameters, allowing users to find results without manual calculations.
| VDD (V) | ID (A) | RD (Ω) | RS (Ω) | VDS (V) |
|---|---|---|---|---|
| 12 | 0.5 | 10 | 5 | 4.5 |
| 15 | 1.0 | 8 | 4 | 3 |
| 18 | 0.8 | 12 | 6 | 3.6 |
| 24 | 1.5 | 5 | 3 | 13.5 |
| 30 | 2.0 | 10 | 5 | 10 |
This table serves as a quick reference for engineers and students working on electronic circuits.
Example of Drain Voltage Calculator
Let's consider an example where:
- Supply voltage (VDD) = 18V
- Drain current (ID) = 1.2A
- Drain resistance (RD) = 6Ω
- Source resistance (RS) = 4Ω
Using the formula: VDS = 18 - 1.2 × (6 + 4) VDS = 18 - 1.2 × 10 VDS = 18 - 12 VDS = 6V
So, the drain-to-source voltage (VDS) is 6V.
Most Common FAQs
The drain voltage (VDS) determines the operating region of a transistor. It is crucial for ensuring that the transistor functions correctly in amplification or switching applications.
If the drain voltage is too low, the transistor may enter saturation, affecting its performance and leading to inefficient circuit operation.
This formula applies mainly to field-effect transistors (FETs). Different transistor types may require modified calculations based on their circuit configurations.