Type of electronic amplifier using a bipolar junction transistor
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In electronics, a common-emitter amplifier is one of three basic single-stage bipolar-junction-transistor (BJT) amplifier topologies, typically used as a voltage amplifier. It offers high current gain (typically 200), medium input resistance and a high output resistance. The output of a common emitter amplifier is inverted; i.e. for a sine wave input signal, the output signal is 180 degrees out of phase with respect to the input.[1]
In this circuit, the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common to both (for example, it may be tied to ground reference or a power supply rail), hence its name. The analogous FET circuit is the common-source amplifier, and the analogous tube circuit is the common-cathode amplifier.
^"Common emitter configuration of BJT". Electrical Classroom. Archived from the original on 2021-06-05.
decrease in IE through RL. It is also named common-emitter amplifier because the emitter of the transistor is common to both the input circuit and output circuit...
Vin, base-to-emitter voltage (VBE) Vo, collector-to-emitter voltage (VCE) and the h-parameters are given by: hix = hie for the common-emitter configuration...
Vin − Vout is applied to the base–emitter junction. The transistor continuously monitors Vdiff and adjusts its emitter voltage to equal Vin minus the mostly...
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...
by the common-mode input voltages. The high-resistance emitter element does not play any role—it is shunted by the other low-resistance emitter follower...
between base and emitter, and the output signal taken between collector and emitter is inverted, relative to the input. The common collector arrangement...
comparator output drives the second common collector stage Q2 (an emitter follower) through the voltage divider R1-R2. The emitter-coupled transistors Q1 and Q2...
effect, the current gain is affected by the collector–emitter voltage. Both gain and base–emitter voltage depend on the temperature. The leakage current...
follower (RL ≈ 1 / gm ≈ Vov / (2ID) ; see common gate). Small RL reduces CM. The article on the common-emitter amplifier discusses other solutions to this...
amplifier variables Two-port networks Common drain Common source Common base CommonemitterCommon collector Paul R. Gray; Paul J. Hurst; Stephen H. Lewis;...
lists some common beta-emitting radionuclides of technological importance, and their properties. Strontium-90 is a commonly used beta emitter used in industrial...
low-input-impedance device. Also, as the base-emitter voltage (VBE) is increased the base-emitter current and hence the collector-emitter current (ICE) increase exponentially...
qualitatively directly from the Gummel plot: The common-emitter current gain, β {\displaystyle \beta } , and the common-base current gain, α {\displaystyle \alpha...
in a commonemitter configuration or field-effect transistors (FETs) in a common source configuration. There are some applications where the common base...
the collector is much longer than the base. The emitter–base junction is unchanged because the emitter–base voltage is the same. Base-narrowing has two...
base of Q1 and emitter resistor, R2. Voltage across R2 (VR2) is given by VZ − VBE, where VBE is the base-emitter drop of Q1. The emitter current of Q1...
the base–emitter voltage. Since there are two junctions between the base and emitter of the Darlington transistor, the equivalent base–emitter voltage...
slang for a tourist or newcomer EMIT or Enzyme multiplied immunoassay technique, a common drug test Emit (video game) Emitter (disambiguation) Emission (disambiguation)...
transistor. Base-to-collector leakage current with emitter open(ico) Short circuits from collector to emitter and base. Some service testers include a go/no-go...
consists of a commonemitter stage feeding into a common base stage when using bipolar junction transistors (BJTs) or alternatively a common source stage...
called "open collector, drives high". Open emitter output exposes the emitter as the output. For an NPN open emitter output, the collector is connected to...
amplification in commonemitter configuration. The frequency at which gain begins to drop off may be much lower, see below. The maximum collector-to-emitter voltage...
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