Miller Effect in Amplifier Frequency Response: According to this effect, when viewed from the input base terminal of the CE-connected transistor the capacitance Ccb appears as (1 – Av)Ccb i.e., it is amplified by a factor of (1 – Av). In fact Miller effect takes into account the feedback from the collector to base and vice versa […]
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Effect of Internal Transistor Capacitance: As we know already that at high frequencies, the coupling and bypass capacitors act as short circuit due to their low reactance and hence the voltage gain is not affected. However, the internal Transistor capacitance play vital role. They reduce the amplifier gain and introduce unwanted phase shift with the
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Low Frequency Response of FET Amplifier: The analysis of the Low Frequency Response of FET Amplifier is quite similar to that of the BJT amplifier. Though here common-source configuration is considered but the results can be applied to most FET configurations. For the circuit given in Fig. 15.23, the capacitors Cin, Cout and CS will determine
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Low Frequency Response of BJT Amplifier: For analysis, we will consider the loaded voltage-divider BJT bias configuration. But the results can be applied to any configuration. For the network shown in Fig. 15.14 the capacitors Cin, Cout and CE will determine the low frequency response of BJT Amplifier. Now we will examine the impact of each
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Millers Theorem and its Equivalent Circuit: Millers theorem – Consider an arbitrary circuit shown in Fig. 15.13(a). As part of a larger network that is not shown, we have isolated two circuit nodes, labelled 1 and 2, between which an impedance Z is connected. Nodes 1 and 2 are also connected to other parts of
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What is Frequency Response of an Amplifier? The voltage gain of an amplifier varies with signal frequency due to the effect of variations in circuit capacitive reactance with signal frequency on the output voltage. The curve drawn between the voltage gain and signal frequency of an amplifier is known as the frequency response. If the
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