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Unformatted text preview: Clipping can also occur in the output signal. The pnp BJT operates in the same manner as the npn, except the current directions and voltage polarities are reversed. In large signal analysis, we can solve for the operating point of the BJT by assuming operating in a certain region, solving the circuit, and then checking to see that the results are consistent with the conditions that need to be satisfied. The four resistor bias circuit is used to bias the BJT in the active region, which is necessary in order to amplify signals. An amplifier in midrange frequencies can be analyzed by the small signal equivalent circuit to determine the gains and impedances of the BJT. The common-emitter amplifier is inverting and has large voltage and current gains, while the emitter-follower amplifier is non-inverting and has near unity voltage gain and large current gain....
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This document was uploaded on 02/16/2012.
- Spring '09