Small Signal Amplifiers

Differential Amplifier Circuit using Transistors

Differential Amplifier Circuit using Transistors: The Differential Amplifier Circuit using Transistors is widely applied in integrated circuitry, because it has both good bias stability and good voltage gain without the use of large bypass capacitors. Differential amplifiers can also be constructed as discrete component circuits.   Figure 12-31(a) shows that a basic Differential Amplifier Circuit …

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DC Feedback Pair with Two Amplification Stages

DC Feedback Pair with Two Amplification Stages: The DC Feedback Pair with Two Amplification Stages circuit shown in Fig. 12-25(a). The base of transistor Q2 is directly connected to the collector of Q1, and the base of Q1 is biased from the emitter of Q2 via resistor R2. Comparing this circuit to the capacitor-coupled circuit of Fig. …

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Two Stage Direct Coupled Common Emitter Amplifier

Two Stage Direct Coupled Common Emitter Amplifier: Figure 12-23 shows Two Stage Direct Coupled Common Emitter Amplifier. This time the second stage is a common collector circuit, or emitter follower. Stage 2 gives the circuit a very low output impedance, but has unity voltage gain Stage 1 still has substantial voltage gain.   The design …

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Single Stage Common Source Amplifier

Single Stage Common Source Amplifier: Bias circuit design for the Single Stage Common Source Amplifier in shown in Fig. 12-10. As with the common-emitter BJT circuit, design commences with specification of the supply voltage, amplification, frequency response, load impedance, etc. Selection of ID,RD, and Rs The circuit shown in Fig. 12-10 has no provision for …

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Single Stage Common Emitter Amplifier Circuit

Single Stage Common Emitter Amplifier Circuit: Specification – Bias circuit design for the Single Stage Common Emitter Amplifier Circuit in shown in Fig. 12-1 and ac analysis of the circuit is already explained. Design of this circuit (or any other circuit) normally commences with a specification which might list: the supply voltage, minimum voltage gain, …

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