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  2. Open collector - Wikipedia

    en.wikipedia.org/wiki/Open_collector

    Open emitter output exposes the emitter as the output. [2] For an NPN open emitter output, the collector is connected to the positive voltage rail, so the emitter outputs a high voltage when the transistor is on and is hi-Z when off. For a PNP open emitter output, the collector is connected to the low voltage supply, so the emitter outputs a ...

  3. Common emitter - Wikipedia

    en.wikipedia.org/wiki/Common_emitter

    Figure 2: Adding an emitter resistor decreases gain, but increases linearity and stability. Common-emitter amplifiers give the amplifier an inverted output and can have a very high gain that may vary widely from one transistor to the next. The gain is a strong function of both temperature and bias current, and so the actual gain is somewhat ...

  4. Common collector - Wikipedia

    en.wikipedia.org/wiki/Common_collector

    The transistor continuously monitors V diff and adjusts its emitter voltage to equal V in minus the mostly constant V BE (approximately one diode forward voltage drop) by passing the collector current through the emitter resistor R E. As a result, the output voltage follows the input voltage variations from V BE up to V +; hence the name ...

  5. Wired logic connection - Wikipedia

    en.wikipedia.org/wiki/Wired_logic_connection

    Open-emitter buffers connected as wired OR. See also: Diode logic § Active-high OR logic gate. The wired OR connection electrically performs the Boolean logic operation of an OR gate using open emitter or similar inputs (which can be identified by the ⎏ symbol in schematics) connected to a shared output with a pull-down resistor. This gate ...

  6. Unijunction transistor - Wikipedia

    en.wikipedia.org/wiki/Unijunction_transistor

    The emitter is of heavily-doped p-type material. The single PN junction between the emitter and the base gives the device its name. The resistance between B1 and B2 when the emitter is open-circuit is called interbase resistance. The emitter junction is usually located closer to base-2 (B2) than base-1 (B1) so that the device is not symmetrical ...

  7. Transistor–transistor logic - Wikipedia

    en.wikipedia.org/wiki/Transistor–transistor_logic

    A common variation omits the collector resistor of the output transistor, making an open-collector output. This allows the designer to fabricate wired logic by connecting the open-collector outputs of several logic gates together and providing a single external pull-up resistor. If any of the logic gates becomes logic low (transistor conducting ...

  8. Common base - Wikipedia

    en.wikipedia.org/wiki/Common_base

    In this circuit the emitter terminal of the transistor serves as the input, the collector as the output, and the base is connected to ground, or "common", hence its name. The analogous field-effect transistor circuit is the common-gate amplifier.

  9. Current source - Wikipedia

    en.wikipedia.org/wiki/Current_source

    Resistor, R1, supplies the Zener current and the base current (I B) of NPN transistor (Q1). The constant Zener voltage is applied across the base of Q1 and emitter resistor, R2. Voltage across R 2 (V R2) is given by V Z − V BE, where V BE is the base-emitter drop of Q1. The emitter current of Q1 which is also the current through R2 is given by

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