Party Cove 2010 Ozarks

TRANSISTORS OPERATING REGIONS

Los transistores bipolares de juntura tienen diferentes regiones operativas, definidas principalmente por la forma en que son polarizados:

• REGIÓN ACTIVA :

Cuando un transistor no está ni en su región de saturación ni en la región de corte entonces está en una región intermedia, la región activa. En esta región la corriente de colector (Ic) depende mainly from the base current (Ib) of β (current gain, is a manufacturer's specification) and resistances that are connected in the collector and emitter. This region is the most important if what you want is to use the transistor as a signal amplifier.

• REVERSE REGION:

When reverse polarity conditions of operation in active mode, the bipolar transistor starts operating in reverse. In this mode, the emitter and collector regions switch roles. Because most of the TBJ are designed to maximize the current gain in active mode, the parameter beta in reverse mode is drastically less than this in active mode.

• REGION COURT:

A transistor is off when corrientedecolector = corrientedeemisor = 0, (Ic = Ie = 0).

In this case the voltage between the collector and emitter of the transistor is the circuit supply voltage. (As there is no current flowing, there is no voltage drop, see Ohm's Law). This case usually occurs when the base current = 0 (Ib = 0)

• saturation region:

A transistor is saturated when corrientedeemisor = corrientemaxima corrientedecolector = (Ic = Ie = Imaxima).

In this case the magnitude of the current depends on the voltage supply circuit and the resistors connected in the collector or issuer or both, do Ohm's law. This case usually occurs when the base current is large enough to induce a current collector β times larger. (Remember that Ic = β * Ib)