Input Voltage of MOS Differential Amplifier on Small-Signal Operation Calculator

Formula Used:

\[ V_{in} = V_{cm} + \frac{1}{2} \times V_{is} \]

Input Voltage (Vin):

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1. What is Input Voltage of MOS Differential Amplifier on Small-Signal Operation?

The Input Voltage of a MOS Differential Amplifier in small-signal operation represents the total input voltage, which consists of the common-mode DC voltage plus half of the differential input signal. This calculation is essential for analyzing the behavior of differential amplifiers in electronic circuits.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ V_{in} = V_{cm} + \frac{1}{2} \times V_{is} \]

Where:

\( V_{in} \) — Input Voltage (Volt)
\( V_{cm} \) — Common-Mode DC Voltage (Volt)
\( V_{is} \) — Differential Input Signal (Volt)

Explanation: The formula calculates the total input voltage by adding the common-mode voltage to half of the differential input signal, which is fundamental in differential amplifier analysis.

3. Importance of Input Voltage Calculation

Details: Accurate input voltage calculation is crucial for designing and analyzing differential amplifiers, ensuring proper circuit operation, and predicting amplifier behavior in small-signal conditions.

4. Using the Calculator

Tips: Enter common-mode DC voltage and differential input signal in volts. Both values must be non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the 1/2 factor in the formula?
A: The 1/2 factor accounts for the equal division of the differential input signal between the two input terminals of the differential amplifier.

Q2: How does common-mode voltage affect amplifier performance?
A: Common-mode voltage determines the DC operating point of the amplifier and affects its linearity and common-mode rejection ratio.

Q3: What are typical values for differential input signals?
A: Differential input signals are typically small (millivolt range) in small-signal operation to maintain linear amplifier behavior.

Q4: Can this formula be used for large-signal analysis?
A: No, this formula is specifically derived for small-signal operation where the amplifier behaves linearly.

Q5: How does temperature affect the input voltage calculation?
A: Temperature primarily affects transistor parameters, but the basic relationship between input voltage components remains valid in small-signal analysis.