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A low-noise amplifier (LNA) is an electronic component that amplifies a very low-power signal without significantly degrading its signal-to-noise ratio (SNR). Any electronic amplifier will increase the power of both the signal and the noise present at its input, but the amplifier will also introduce some additional noise.
The design of the distributed amplifiers was first formulated by William S. Percival in 1936. [1] In that year Percival proposed a design by which the transconductances of individual vacuum tubes could be added linearly without lumping their element capacitances at the input and output, thus arriving at a circuit that achieved a gain-bandwidth product greater than that of an individual tube.
This allows the TWT to have a very low noise output, a major advantage of the design. More usefully, this process is much less sensitive to the physical arrangement of the tube, which allows the TWT to operate over a wider variety of frequencies. TWT's are generally at an advantage when low noise and frequency variability are useful. [6] [7]
FBARs can also be integrated with power amplifiers (PA) or low noise amplifiers (LNA) to form a module solution with the related electronic circuitry. Although monolithic integrated of FBARs on the same substrate with the electronic circuitry like CMOS has been demonstrated it requires several additional process steps and mask layers on top of ...
Power op-amp with a maximal current output of 3 amperes [23] LM709 Yes General-purpose op-amp [24] LM741 LM709 General-purpose op-amp. [25] Widely used. LM747: Yes General-purpose dual op-amp. [26] LM748 General-purpose op-amp with external compensation [27] LM833 Dual high-speed audio operational amplifiers [28] LM837 Low-noise quadruple op ...
(This is the reason for the relatively high noise resistance of the EF86 in the above example.) Thus, tubes with low noise at high frequency do not necessarily have low noise in the audio frequency range. For special low-noise audio tubes, the frequency at which 1/f noise takes over is reduced as far as possible, maybe to approximately a ...
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