# Question 7.6: To gain more insight into the operation of transistor amplif...

To gain more insight into the operation of transistor amplifiers, we wish to consider the waveforms at various points in the circuit analyzed in the previous example. For this purpose assume that vi has a triangular waveform. First determine the maximum amplitude that vi is allowed to have. Then, with the amplitude of vi set to this value, give the waveforms of the total quantities iB(t), vBE(t), iC(t), and vC(t).

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Question: 7.3

## Figure 7.15(a) shows a discrete MOSFET amplifier utilizing a drain-to-gate resistance RG for biasing purposes. Such a biasing arrangement will be studied in Section 7.4. The input signal vi is coupled to the gate via a large capacitor, and the output signal at the drain is coupled to the load ...

We first determine the dc operating point. For thi...
Question: 7.9

## For the CE amplifier specified in Example 7.8, what value of Re is needed to raise Rin to a value four times that of Rsig? With Re included, find Avo, Ro, Av , and Gv. Also, if vπ is limited to 5 mV, what are the corresponding values of vsig and vo? ...

To obtain Rin = 4 Rsig = 4 × 5 = 20 kΩ, the requir...
Question: 7.12

## We wish to design the bias network of the amplifier in Fig. 7.52 to establish a current IE = 1 mA using a power supply VCC = +12 V. The transistor is specified to have a nominal β value of 100. ...

We shall follow the rule of thumb mentioned above ...
Question: 7.11

## It is required to design the circuit of Fig. 7.48(c) to establish a dc drain current ID = 0.5 mA. The MOSFET is specified to have Vt = 1 V and k′n W/L =1 mA/V². For simplicity, neglect the channel-length modulation effect (i.e., assume λ = 0). Use a power-supply VDD = 15 V. Calculate the percentage ...

As a rule of thumb for designing this classical bi...
Question: 7.10

## It is required to design an emitter follower to implement the buffer amplifier of Fig. 7.46(a). Specify the required bias current IE and the minimum value the transistor β must have. Determine the maximum allowed value of vsig if vπ is to be limited to 5 mV in order to obtain reasonably linear ...

The emitter-follower circuit is shown in Fig. 7.46...
Question: 7.8

## A CE amplifier utilizes a BJT with β = 100 is biased at IC = 1 mA and has a collector resistance RC = 5 kΩ. Find Rin, Ro, and Avo. If the amplifier is fed with a signal source having a resistance of 5 kΩ, and a load resistance RL =5 kΩ is connected to the output terminal, find the resulting Av and ...

At IC = 1 mA, g_{m} = \frac{I_{C}}{V_{T}} =...
Question: 7.7

## We need to analyze the circuit of Fig. 7.30(a) to determine the voltage gain and the signal waveforms at various points. The capacitor CC1 is a coupling capacitor whose purpose is to couple the signal vi to the emitter while blocking dc. In this way the dc bias established by V^+ and V^− together ...

Here again we shall follow a five-step process: 1....
Question: 7.5

## We wish to analyze the transistor amplifier shown in Fig. 7.28(a) to determine its voltage gain vo/vi. Assume β = 100 and neglect the Early effect. ...

We shall follow a five-step process: 1. The first ...
Question: 7.4

## Figure 7.18(a) shows a MOSFET amplifier biased by a constant-current source I. Assume that the values of I and RD are such that the MOSFET operates in the saturation region. The input signal vi is coupled to the source terminal by utilizing a large capacitor CC1. Similarly, the output signal at the ...

(a) I_{C} = \frac{V_{CC}  -  V_{CE}}{R_{C}}...