ELEC2133 Lecture Notes - Lecture 3: Gs1, Royal Aircraft Factory B.E.2, Dic Entertainment
21 Aug 2018
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3. 1. 5 small-signal analysis converting from dc to ac. For all of the analysis, the following will be assumed: the transistor is operating in the appropriate mode. Bjt this is the active mode: the biasing of the circuit has established the desired dc conditions to give the required large signal output voltage swing. Our approach to the analysis of the amplifier circuits will be the following: model the circuit in a form suitable for ac analysis, i. e. , connect all points at the same. Ac potential together: model the active devices in terms of small signal linear approximations. The frequency response of the amplifier circuits can be broken down typically into three regions: low frequency, mid band and high frequency. In general, the gain of the circuit will drop off at high and low frequencies, with a range of frequencies at which the gain remains constant.
