Measure of the opposition to current flow by an external electrical load
In electrical engineering, the input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into a load network that is external to the electrical source network. The input admittance (the reciprocal of impedance) is a measure of the load network's propensity to draw current. The source network is the portion of the network that transmits power, and the load network is the portion of the network that consumes power.
The circuit to the left of the central set of open circles models the source circuit, while the circuit to the right models the connected circuit. ZS is the output impedance seen by the load, and ZL is the input impedance seen by the source.
electrical engineering, the inputimpedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance)...
feedback, an op amp circuit's characteristics (e.g. its gain, input and output impedance, bandwidth, and functionality) can be determined by external components...
Equivalently, it can be defined as the inputimpedance of a transmission line when its length is infinite. Characteristic impedance is determined by the geometry...
Nominal impedance, approximate designed impedanceImpedance matching, the adjustment of inputimpedance and output impedance Mechanical impedance, a measure...
operational amplifier's equivalent circuit has a finite inputimpedance, a non-zero output impedance, and a finite gain. A real op-amp has a number of non-ideal...
electrical engineering, impedance matching is the practice of designing or adjusting the inputimpedance or output impedance of an electrical device for...
to capacitance, any impedance connected between the input and another node exhibiting gain can modify the amplifier inputimpedance via this effect. These...
raises inputimpedance, and reduces distortion, it predates the invention of the negative feedback amplifier and does not reduce output impedance or increase...
the above formula can be rearranged to express the inputimpedance in terms of the load impedance rather than the load voltage reflection coefficient:...
000 tubes or more), high gain, gain stability, high inputimpedance, medium/low output impedance, good clipper (with a not-too-long tail), non-inverting...
The antenna is resonant at this length, so its inputimpedance is purely resistive. The inputimpedance has capacitive reactance below 1/ 4 λ and inductive...
high inputimpedance was necessary. The VTVM had a fixed inputimpedance of typically 1 MΩ or more, usually through use of a cathode follower input circuit...
second circuit is influenced by output impedance of the first circuit (as it is larger than the inputimpedance of the second circuit). In the ideal voltage...
{(1-K)}{Z}}{V_{1}}={(1-K)}{I_{in0}}} and the inputimpedance of the circuit seen from the side of the input source accordingly increases/decreases Z i n...
the inputimpedance of a network with the addition of an element designated as "extra". In this case, Zd is the same as the impedance of the input test...
systems to connect a high output impedance unbalanced output signal to a low-impedance, microphone level, balanced input, usually via an XLR connector and...
the characteristic impedance of a cable or other form of transmission line. The nominal value of the input, output or image impedance of a port of a network...
systems, a high-impedanceinput may be required for use with devices such as crystal microphones or other devices with high internal impedance. In analog circuits...
it is usually employed for amplifiers that require an unusually low inputimpedance, for example to act as a preamplifier for moving-coil microphones....
The probe connects to any input on the instrument and typically has a resistor of ten times the oscilloscope's inputimpedance. This results in a 0.1 (‑10×)...
output impedance ZS in illustration) is connected to the input of another device (the load impedance ZL in the illustration), these two impedances form...
digital input signal and isolate it from any output load. For the typical case of using voltages as logic signals, a logic buffer's inputimpedance is high...
discontinuity in the characteristic impedance of the line, or if the far end of the line is not terminated in its characteristic impedance. This can happen, for instance...
in 1923. The distinguishing feature of Zobel networks is that the inputimpedance is fixed in the design independently of the transfer function. This...
the impedance bridging principle, in which a low impedance output drives a high impedanceinput. A typical line out connection has an output impedance from...
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