The 3STL2540 is a -40V/-5A PNP transistor
capable of full saturation with maximum voltage drop of 200mV at only 10mA base current.
In addition, spiral inductors, nitride capacitors, three types of poly resistors, a lateral pnp transistor
, RF- and DC-electrostatic discharge protection, and varactor diodes are incorporated in the present technology.
It is possible to use a silicon pnp transistor
with low saturation voltage such as type BCP69 or BCP72 devices to switch the drain current off during the receive mode and nonactive time slots.
Figure 2A shows the current booster with an NPN transistor and Figure 2B with a PNP transistor
2] The internal Schottky diode reduces both size and assembly requirements, while the internal PNP transistor
disconnects the output load from the input during shutdown and provides output short-circuit protection.
For these reasons the designer must ensure that the gain of the PNP transistor
be reduced by bypassing the collector and the emitter side of the PNP, and possibly the base.
p] is the current gain of the PNP transistors