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Constant Current Source in Differential Amplifier

Constant Current Source in Differential Amplifier: An ideal current source provides a constant current regardless of the load connected to it. There are many applications in electronics for a circuit that provides a constant current with a very high impedance. Constant Current Source in Differential Amplifier can be built using FET devices, bipolar devices, and …

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Single Input Unbalanced Output Differential Amplifier

Single Input Unbalanced Output Differential Amplifier: Single input unbalanced output differential amplifier configu­rations are rarely used. The reasons for this are as follows: This configuration is identical to the CE amplifier but it needs comparatively more components and yields less voltage gain than that of CE amplifier. A dc output voltage exists even in absence …

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Single Input Balanced Output Differential Amplifier

Single Input Balanced Output Differential Amplifier: In a single input balanced output differential amplifier an input signal is applied to either input, with the other input connected to ground. However, due to the common-emitter connection the input signal operates both transistors, resulting in output from both collectors. Single input balanced output differential amplifier is depicted …

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Feedback Pair Connection – Operation and its Equivalent Circuit

Feedback Pair Connection – Operation and its Equivalent Circuit: The feedback pair connection (Fig. 19.58) is a two-transistor circuit that operates like the Darlington amplifier. It makes use of a PNP transistor driving an NPN transistor, the two devices acting much like one PNP transistor. Like Darlington amplifier the feedback pair connection also provides a …

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Bootstrapped Darlington Circuit Operation and its Equivalent Circuit

Bootstrapped Darlington Circuit Operation and its Equivalent Circuit: The maximum input resistance of a Darlington circuit is limited to 1/hob ≡ 2 MΩ, as 1/hob is the resistance between base and collector. However, the input resistance can be largely increased by bootstrapped darlington circuit through the addition of capacitor C’ between the first collector terminal …

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Darlington Pair Transistor – Circuit Diagram and its Workings

Darlington Pair Transistor – Circuit Diagram and its Workings: A very popular connection of two BJTs for operation as one “superbeta” transistor is the Darlington connection. In practice, the two transistors are put inside a single package and three terminals E, B and C are brought out, as de­picted in Fig. 19.52. The main fea­ture …

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Darlington Amplifier – Circuit Diagram, Characteristics, Merits and Applications

Darlington Amplifier – Circuit Diagram, Characteristics, Merits and Applications: Darlington amplifier with voltage divider bias is shown in Fig. 19.50. In this circuit the output of one amplifier is coupled into the input of the next one by directly joining emitter of one transistor to the base of the other one, as shown in the …

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