Difference between revisions of "Test"

From Mech
Jump to navigationJump to search
Line 13: Line 13:
pnp transistor.
pnp transistor.


Beware that there is a “dead band” when V<sub>in</sub> is between 0.7V
Beware that there is a "dead band" when V<sub>in</sub> is between 0.7V
and -0.7V, because the voltage has not pass the cutoff voltage for
and -0.7V, because the voltage has not pass the cutoff voltage for
either transistor. This is known as '''crossover distortion'''.
either transistor. This is known as '''crossover distortion'''.

Revision as of 17:34, 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.

Transistor push pull follower.gif

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.