4.71, and determine the voltage gain and input impedance. If a load resistor of 10 k is connected at the output, what will the new voltage gain? Fig. 4.71 Circuit for Question 1 Full size image 2. Draw the h-parameter equivalent circuit of a common emitter H-biased amplifier circuit,...
To understand the concept of Bipolar Junction Transistor Amplifier, we should look through the diagram of a p-n-p transistor first. Now as the input voltage is changed a little, say ΔVi of the emitter-base voltage changes the barrier height and the emitter current by ΔIE. This change in...
BJT is a current-controlled device, while MOSFET operates as a voltage-controlled device. 5 Can both BJT and MOSFET be used in power electronics? Yes, both BJT and MOSFET can be used in power electronics, but the specific choice depends on the application's requirements. 5 Can you name th...
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From this discussion, it can be concluded that there are various differences between a bipolar junction transistor (BJT) and a field effect transistor (FET). Both of these transistors are widely used in different electronic applications such as switching and amplification, etc. Thus, the knowledge...
The role of the MOSFET base in a BJT is to control the current flow through the BJT. The MOSFET base acts as a switch, turning the BJT on or off based on the voltage applied to it. When the voltage at the MOSFET base is low, the BJT is turned off and no current flows through ...
EXAMPLE 6–2 ▶ FIGURE 6–4 The ac load line operation of a certain amplifier extends 10 mA above and below the Q-point base current value of 50 mA, as shown in Figure 6–4. Determine the resulting peak-to-peak values of collector current and collector-to-emitter voltage from the ...
AC analysis of a common-emitter amplifier circuit begins by recognizing the capacitive reactance (XC) remains very low at the signal frequency. By considering XC as equal to zero, reducing the circuit to an ac equivalent circuit requires replacing the three capacitors in the circuit with effective...
As the base-emitter voltage VBE is gradually increased from 0 V, it first has to overcome the virtual cell (0.6 V for a silicon transistor) before any current will flow from base to emitter. As soon as VBE reaches about 0.6 V, current begins to flow. Looking at this in terms of the...
The chapter schematically depicts a typical common-collector circuit. As usual, capacitors couple the circuit to preceding and following stages. But these capacitors are not an essential part of the amplifier. If input or output quiescent voltage levels are suitable, the amplifier may be wired ...