Difference between revisions of "Test"
From Mech
Jump to navigationJump to search| Line 3: | Line 3: | ||
voltages; pnp transistor for negative voltages), we get a push-pull |
voltages; pnp transistor for negative voltages), we get a push-pull |
||
follower. |
follower. |
||
Revision as of 17:39, 18 August 2009
Push-Pull Follower
If we put two emitter followers together (npn transistor for positive voltages; pnp transistor for negative voltages), we get a push-pull follower.
If > 0.7V, then the current is amplified by the npn transistor.
If < -0.7V, then the current is amplified by the pnp transistor.
Beware that there is a “dead band” when Vin is between 0.7V and -0.7V, because the voltage has not pass the cutoff voltage for either transistor. This is known as crossover distortion. ~
