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  2. Common drain - Wikipedia

    en.wikipedia.org/wiki/Common_drain

    In electronics, a common-drain amplifier, also known as a source follower, is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage buffer. In this circuit (NMOS) the gate terminal of the transistor serves as the signal input, the source is the output, and the drain is common to both ...

  3. Field-effect transistor - Wikipedia

    en.wikipedia.org/wiki/Field-effect_transistor

    The device consists of an active channel through which charge carriers, electrons or holes, flow from the source to the drain. Source and drain terminal conductors are connected to the semiconductor through ohmic contacts. The conductivity of the channel is a function of the potential applied across the gate and source terminals.

  4. Power MOSFET - Wikipedia

    en.wikipedia.org/wiki/Power_MOSFET

    Furthermore, as it is a lightly doped region, its intrinsic resistivity is non-negligible and adds to the MOSFET's ON-state Drain-to-Source Resistance (R DSon) (this is the R n resistance in figure 2). Two main parameters govern both the breakdown voltage and the R DSon of the transistor: the doping level and the thickness of the N − ...

  5. MOSFET - Wikipedia

    en.wikipedia.org/wiki/MOSFET

    The source and drain (unlike the body) are highly doped as signified by a "+" sign after the type of doping. If the MOSFET is an n-channel or nMOS FET, then the source and drain are n+ regions and the body is a p region. If the MOSFET is a p-channel or pMOS FET, then the source and drain are p+ regions and the body is a n region. The source is ...

  6. Channel length modulation - Wikipedia

    en.wikipedia.org/wiki/Channel_length_modulation

    Because resistance is proportional to length, shortening the channel decreases its resistance, causing an increase in current with increase in drain bias for a MOSFET operating in saturation. The effect is more pronounced the shorter the source-to-drain separation, the deeper the drain junction, and the thicker the oxide insulator.

  7. Common source - Wikipedia

    en.wikipedia.org/wiki/Common_source

    The easiest way to tell if a FET is common source, common drain, or common gate is to examine where the signal enters and leaves. The remaining terminal is what is known as "common". In this example, the signal enters the gate, and exits the drain. The only terminal remaining is the source. This is a common-source FET circuit.

  8. Voltage-controlled resistor - Wikipedia

    en.wikipedia.org/wiki/Voltage-controlled_resistor

    In the circuit on the figure, a non-linearized VCR design, the voltage-controlled resistor, the LSK489C JFET, is used as a programmable voltage divider. The VGS supply sets the level of the output resistance of the JFET. The drain-to-source resistance of the JFET (R DS) and the drain resistor (R 1) form the voltage-divider network. The output ...

  9. CMOS - Wikipedia

    en.wikipedia.org/wiki/CMOS

    On the other hand, the composition of an NMOS transistor creates high resistance between source and drain when a low gate voltage is applied and low resistance when a high gate voltage is applied. CMOS accomplishes current reduction by complementing every nMOSFET with a pMOSFET and connecting both gates and both drains together.

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