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A load line diagram, illustrating an operating point in the transistor's active region.. Biasing is the setting of the DC operating point of an electronic component. For bipolar junction transistors (BJTs), the operating point is defined as the steady-state DC collector-emitter voltage and the collector current with no input signal applied.
The operating point of a device, also known as bias point, quiescent point, or Q-point, is the DC voltage or current at a specified terminal of an active device (a transistor or vacuum tube) with no input signal applied. A bias circuit is a portion of the device's circuit that supplies this steady current or voltage.
Figure 1: Basic NPN common collector circuit (neglecting biasing details). In electronics , a common collector amplifier (also known as an emitter follower ) is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies , typically used as a voltage buffer .
Figure 1: Basic NPN common base circuit (neglecting biasing details). In electronics, a common-base (also known as grounded-base) amplifier is one of three basic single-stage bipolar junction transistor (BJT) amplifier topologies, typically used as a current buffer or voltage amplifier.
3D model of a TO-92 package, commonly used for small bipolar transistors. A bipolar junction transistor (BJT) is a type of transistor that uses both electrons and electron holes as charge carriers. In contrast, a unipolar transistor, such as a field-effect transistor (FET), uses only one kind of charge carrier.
Figure 1: Basic N-channel JFET common-source circuit (neglecting biasing details). Figure 2: Basic N-channel JFET common-source circuit with source degeneration. In electronics, a common-source amplifier is one of three basic single-stage field-effect transistor (FET) amplifier topologies, typically used as a voltage or transconductance amplifier.
In this circuit, the source terminal of the transistor serves as the input, the drain is the output, and the gate is connected to some DC biasing voltage (i.e. an AC ground), or "common," hence its name. The analogous bipolar junction transistor circuit is the common-base amplifier.
Cascode circuits were employed in early television sets for the 'front-end' or tuner because of their low noise and wider bandwidth. Bipolar Junction Transistors have collector-base parasitic capacitance in the low picofarad to fractional picofarad range. The Miller Effect means that when this capacitance is in the feedback path, it results in ...