collector current การใช้

• Resistor Rc is the collector load resistor for the collector current.
• This causes a base current and much larger collector current to flow.
• It shows the collector current in the transistor " I"
• The collector current has two components : minority carriers and majority carriers.
• Collector current is approximately ? ( common-emitter current gain ) times the base current.
• The physical explanation for collector current is the concentration of minority carriers in the base region.
• That is, the collector current is approximately \ beta _ F times the base current.
• The maximum collector current I C ( max ) of the pair is that of Q 2.
• Additional matched transistors can be connected to the same base and will supply the same collector current.
• Under this condition all three transistors have nearly equal collector currents and therefore approximately equal base currents.
• Some models base the collector current correction factor on the collector base voltage " V"
• Because an increase in collector current with temperature is opposed, the operating point is kept stable.
• In contrast, the Baker clamp reduces the transistor base current rather than supplying more collector current.
• When Q2 turns on, it removes base current from Q1 thereby reducing the collector current of Q1.
• Q3 / Q4 collector currents, and accordingly the output current at the base of Q15, remain unchanged.
• The output ( collector ) conductance is determined by the Early voltage and is proportional to the collector current.
• It has usually a high resistance to limit the static collector current, so the recharging process is slow.
• Neglecting the base currents of Q1 and Q2, the collector current of Q1 is also the load current.
• Its collector current reduces; as a result, the shared emitter voltage lowers slightly and Q1 collector voltage rises significantly.
• For equal collector currents, this drawback translates to an increase in the dissipated power for the Darlington transistor over a single transistor.