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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.
Bell Labs [b] is an American industrial research and development (R&D) company, currently operating as a subsidiary of Finnish technology company Nokia.With a long history, Bell Labs is credited with the development of radio astronomy, the transistor, the laser, the photovoltaic cell, the charge-coupled device (CCD), information theory, the Unix operating system, and the programming languages ...
5 W audio power amplifier (fixed 34 dB gain) [44] LM1875 20 W audio power amplifier (up to 90 dB gain) [45] LM1876 Dual 20 W audio power amplifier with Mute and Standby Modes (up to 90 dB gain) [46] LM386: Low voltage audio power amplifier [47] LM389 Yes Low voltage audio power amplifier (same as LM386) with 3 NPN transistors LM3875: Yes
(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 ...
FETs in the signal pre-amp were replaced with bipolar transistors (2N3391A). Revision C January 9, 1970 1079–1238 Low noise ("LN") circuitry was added in the signal preamp, reducing DS voltage on the gain reduction FET and keeping the FET within its linear range. The FET feedback circuit was revised to minimize distortion.
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