Magnitude of power supplies VCC and –VEE will be same. Collectors are connected to main supply VCC through collector resistor Rc. Dual Input Balanced Output Differential Amplifier using Transistor – Dual Input Balanced OutputĪbove circuit consists of two identical transistors Q1 and Q2 with its emitters coupled together. The voltage gain is half the gain of the dual input, balanced output differential amplifier. Unbalanced output will contain unnecessary dc content as it is a dc coupled amplifier therefore this configuration should follow by a level translator circuit. Differential Amplifier using Transistor – Dual Input Unbalanced OutputĪmplified version of difference in both signals will be available at the output. There won’t be any unnecessary dc content in balanced output as the dc contents in both outputs gets canceled each other.īoth inputs are given in this case ie, differential input but the output is taken from only one of the two collectors with respect to ground as shown below. This will give us more amplified version of output as it is combining the effect of both transistors. Differential Amplifier using Transistor – Single Input Balanced Output Single Input Balanced OutputĪs above only one input signal is given even though the output is taken from both collectors. The effect of input voltage V in1 is coupled to the transistor Q2 via the common emitter resistor R E. You can see the proof of this in the AC Analysis section. How the transistor Q2 also producing output voltage even though the input is provided only to transistor Q1 ?

Unbalanced output will contain unnecessary dc content as it is a dc coupled amplifier therefore this configuration should follow by a level translator circuit. At the same time it’s amplified and non-inverted voltage gets generated at the collector of the transistor Q2 as shown in the above diagram.

When input signal V in1 is applied to the transistor Q1, it’s amplified and inverted voltage gets generated at the collector of the transistor Q1. Differential Amplifier using Transistor – Single Input Unbalanced Output In this case, only one input signal is given and the output is taken from only one of the two collectors with respect to ground as shown below.

Bjt diagram