Category Archive for: FREQUENCY RESPONSE

FREQUENCYRESPONSEOF FET AMPLIFIERS

Low-Frequency Response of FET AmpUfiers Figure 10-35 shows a common-source JFET amplifier biased using the combination of self-bias and a voltage divider as studied in Chapter 7 For our purposes now the PET could also be a MOSFET. The capacitors that affect the low-frequency Figure W The lowfrequency response of an FET amplifier is affected…

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High-Frequency Response of BJT Amplifiers

High-Frequency Response of BJT Amplifiers Figure 10-32 shows a common-emitter amplifier having interconnection capacitance designated and C Since we arc now considering high-frequency performance the emitter bypass capacitor effectively shorts the emitter terminal to ground so are input-to-ground and output-to-ground capacities respectively W can apply the general equations developed earlier to determine the upper cutoff frequency…

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approximately

The results show that the midland gain is approximately 132.7 (at 10 kHz, about one decade above the lower cutoff frequency the actual gain may be slightly greater at higher frequencies) Thus the gain will be approximately 0.707(132.7) = 93.8 at the lower cutoff frequency The frequency at which the output is nearest 93.81.259 kHz…

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10-6 FREQUENCY RESPONSE OF BJT AMPLIFIERS

Low-Frequency Response of BJT Amplifiers We have learned that the lower cutoff frequency of an amplifier is approximately equal to the larger of (CI) and NC), where  where B is the bandwidth, in hertz. Equation 10-39 is used when the lower cutoff.frequency is 0 (dc) or very small, so that the bandwidth is essentially the…

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TRANSIENT RESPONSE

The transient response of an electronic amplifier or system is the output waveform that results when the input is a pulse or a sudden change in level. Since the transient response is a waveform, it is presented as a plot of voltage versus time, in contrast to frequency response, which is plotted versus frequency. Figure…

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Shunt Capacitance and High Frequency Response

admittance consists of the conductance component and the capacities sustenance component we(1 – A,)Note that this input admittance is exactly the same  where Equation IO-AX shows that the input as it would be if a capacitance having value Cc(I – A) were connected between input and ground. instead of capacitance C(, connected between input and output.between…

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capacitance

Figure 10-18 shows shunt capacitance Co connected across the output of an amplifier. The output resistance R of the amplifier. the load resistance RI and the capacitance CL form a low-pass RC network that has the same effect on the high frequency response as the low-pass network at the input: the gain falls off because…

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SHUNT CAPACITANCE AND HIGH FREQUENCY RESPONSE

coil Once that provides an ac path between an amplifier’s signal flow path and ground is said to shunt the signal. The most common form 01 shunt capacitance is t which exists between the terminals of an electronic device due to its structural characterize-tics. Recall, lot example, that a PN junction has capacitance between its…

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frequency

have a lower cutoff frequency equal to the larger of INC) and  figure 10-12 shows the frequency response for the case i(CI) = 10 Hz and (C) = lollop The mid-band gain is assumed to he 20 dB. It is clear that  = 100 Hz, because the gain at that frequency is 20  3 =…

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SERIES CAPACITANCE AND LOW FREQUENCY RESPONSE

The lower cutoff frequency of an amplifier is affected by capacitance connected in series with the signal flow path. The most important example of series-connected capacitance is the amplifier’s input and output coupling capacitors. At low frequencies, the reluctance of these capacitors becomes very large, so a significant portion of tl e ac signal is…

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