rf amplifiers. The information that follows summarizes the important points of this chapter. A FREQUENCY-RESPONSE CURVE will enable you to determine the BANDWIDTH and the UPPER and LOWER FREQUENCY LIMITS of an amplifier. ">
This chapter has presented information on video and rf amplifiers. The information that follows summarizes the important points of this chapter.
THE BANDWIDTH of an amplifier is determined by the formula:
THE INTERELECTRODE CAPACITANCE of a transistor causes DEGENERATIVE FEEDBACK at high frequencies.
SERIES PEAKING is accomplished by a peaking coil in series with the output-signal path.
SHUNT PEAKING is accomplished by a peaking coil in parallel (shunt) with the output-signal path.
COMBINATION PEAKING is accomplished by using both series and shunt peaking.
LOW-FREQUENCY COMPENSATION is accomplished in a video amplifier by the use of a parallel RC circuit in series with the load resistor.
A RADIO-FREQUENCY (RF) AMPLIFIER uses FREQUENCY-DETERMINING NETWORKS to provide the required response at a given frequency.
ADEQUATE BANDPASS is accomplished by optimum coupling in the rf transformer or by the use of a SWAMPING RESISTOR.
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