DIFFERENTIAL AMPLIFIER: A differential amplifier built using two NPN BJTs. It is powered by a dual ±20 V supply and uses matched resistors for symmetry. The circuit amplifies the difference between two input signals—one at 1 kHz and the other at 2 kHz—while rejecting any common-mode signals. The shared emitter resistor (100 Ω) provides negative feedback, improving linearity and stability. Differential amplifiers like this are commonly used in analog signal processing @and the input stages of op-

This simulation demonstrates the working of a BJT differential amplifier under dynamic signal conditions. Two matched transistors share a common emitter resistance, forming a long-tailed pair. When a sinusoidal input is applied, the tail current remains almost constant, forcing current redistribution between the two transistors. As one transistor conducts more, the other conducts less, producing equal-magnitude but opposite-phase outputs at the collectors. The waveform plot clearly shows this ph

This simulation demonstrates the working of a Differential Amplifier, a fundamental building block in analog electronics. It uses two input signals of different frequencies (1 kHz and 2 kHz) and shows how the amplifier outputs the difference between them. The waveform at the output clearly highlights the differential nature, amplifying only the difference while rejecting any common signals. This circuit is widely used in sensor interfacing, audio processing, and operational amplifier configurati