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2. RF power amplifier - Wikipedia

   en.wikipedia.org/wiki/RF_power_amplifier

   A radio-frequency power amplifier ( RF power amplifier) is a type of electronic amplifier that converts a low-power radio-frequency (RF) signal into a higher-power signal. [1] Typically, RF power amplifiers are used in the final stage of a radio transmitter, their output driving the antenna. Design goals often include gain, power output ...

3. Johnson–Nyquist noise - Wikipedia

   en.wikipedia.org/wiki/Johnson–Nyquist_noise

   Ideal capacitors, as lossless devices, do not have thermal noise. However, the combination of a resistor and a capacitor (an RC circuit , a common low-pass filter ) has what is called kTC noise. The noise bandwidth of an RC circuit is Δ f = 1 4 R C . {\displaystyle \Delta f{=}{\tfrac {1}{4RC}}.}

4. Microwave auditory effect - Wikipedia

   en.wikipedia.org/wiki/Microwave_auditory_effect

   The microwave auditory effect, also known as the microwave hearing effect or the Frey effect, consists of the human perception of sounds induced by pulsed or modulated radio frequencies. The perceived sounds are generated directly inside the human head without the need of any receiving electronic device. The effect was first reported by persons ...

5. Low-noise amplifier - Wikipedia

   en.wikipedia.org/wiki/Low-noise_amplifier

   Low-noise amplifier. 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.

6. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise -cancelling headphones alongside a carry case. Noise-cancelling headphones are headphones which suppress unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing . Noise cancellation makes it possible to listen to audio ...

7. Personal sound amplification product - Wikipedia

   en.wikipedia.org/wiki/Personal_sound...

   PSAP amplifiers are usually small simple devices. They amplify sounds and deliver the result to the ear (s) of the user. The main components are a microphone, amplifier, speaker, volume controller and power source. The microphone captures the sound (pressure) waves and converts them to an electric signal. The amplifier (an electronic circuit ...