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  2. Common collector - Wikipedia

    en.wikipedia.org/wiki/Common_collector

    The common collector amplifier's low output impedance allows a source with a large output impedance to drive a small load impedance without changing its voltage. Thus this circuit finds applications as a voltage buffer. In other words, the circuit has current gain (which depends largely on the h FE of the transistor) instead of voltage gain. A ...

  3. Proper zero-signal collector current - Wikipedia

    en.wikipedia.org/wiki/Proper_zero-signal...

    Consider an NPN transistor circuit. During the positive half-cycle of the signal, the base is positive with respect to the emitter and hence the base-emitter junction is forward biased. This causes a base current and much larger collector current to flow. The positive half-cycle of the signal is amplified in the collector.

  4. Widlar current source - Wikipedia

    en.wikipedia.org/wiki/Widlar_current_source

    The inverse of the design problem is finding the current when the resistor values are known. An iterative method is described next. Assume the current source is biased so the collector-base voltage of the output transistor Q 2 is zero. The current through R 1 is the input or reference current given as,

  5. Current mirror - Wikipedia

    en.wikipedia.org/wiki/Current_mirror

    In other words, the right half of the circuit can be duplicated several times. Note, however, that each additional right-half transistor "steals" a bit of collector current from Q 1 due to the non-zero base currents of the right-half transistors. This will result in a small reduction in the programmed current.

  6. Safe operating area - Wikipedia

    en.wikipedia.org/wiki/Safe_operating_area

    Illustration of safe operating area of a bipolar power transistor. Any combination of collector current and voltage below the line can be tolerated by the transistor. Often, in addition to the continuous rating, separate SOA curves are also plotted for short duration pulse conditions (1 ms pulse, 10 ms pulse, etc.).

  7. Bipolar junction transistor - Wikipedia

    en.wikipedia.org/wiki/Bipolar_junction_transistor

    Bipolar transistors can be considered voltage-controlled devices (fundamentally the collector current is controlled by the base–emitter voltage; the base current could be considered a defect and is controlled by the characteristics of the base–emitter junction and recombination in the base).

  8. Current source - Wikipedia

    en.wikipedia.org/wiki/Current_source

    The transistor, Q1, adjusts the output (collector) current so as to keep the voltage drop across the constant emitter resistor, R2, almost equal to the relatively constant voltage drop across the Zener diode, DZ1. As a result, the output current is almost constant even if the load resistance and/or voltage vary.

  9. Load line (electronics) - Wikipedia

    en.wikipedia.org/wiki/Load_line_(electronics)

    In a circuit with a three terminal device, such as a transistor, the current–voltage curve of the collector-emitter current depends on the base current. This is depicted on graphs by a series of (I C –V CE) curves at different base currents. A load line drawn on this graph shows how the base current will affect the operating point of the ...