November 2007
Intermediate to advanced
736 pages
46h 32m
English
Content preview from Consumer Electronics
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CHAPTER 19
LOW LEVEL AMPLIFIERS
In low level amplifiers it is assumed that the signal level is small such that the signal “swing” is only over a small region of the load line around the dc operating point. The ac characteristics of the transistor can be assumed to be constant as long as bias stabilisation is used. A low level amplifier can amplify a small signal of micro volts to a level high enough to feed the driver stage of a power amplifier. Only on rare occasions will a single stage be sufficient, two or three stages being more usual. General points for consideration in the design of an amplifier are circuit configuration, number of stages, bias stabilisation, interstage coupling, gain control, frequency response and first stage signal-to-noise ...
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