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تقویتکننده با نویز پایین (به انگلیسی: Low-noise amplifier، LNA) تقویت کنندهای الکترونیکی برای تقویت سیگنالهای بسیار ضعیف است. این تقویت کننده معمولا بسیار نزدیک به آنتن گیرنده قرار داده میشود تا نسبت سیگنال به نویز در هنگام پردازش سیگنال دریافتی افت نکند.
A low-dropout or LDO regulator is a DC linear voltage regulator that can regulate the output voltage even when the supply voltage is very close to the output voltage. The advantages of a low dropout voltage regulator over other DC to DC regulators include the absence of switching noise (as no switching takes place), smaller device size (as neither large inductors nor transformers are needed), and greater design simplicity (usually consists of a reference, an amplifier, and a pass element). A significant disadvantage is that, unlike switching regulators, linear DC regulators must dissipate power across the regulation device in order to regulate
the output voltage
Design of a Broadband Low-Noise Amplifier
A Low-noise amplifier (LNA) is an electronic amplifier that amplifies a very low-power signal without significantly degrading its signal-to-noise ratio. An amplifier increases the power of both the signal and the noise present at its input. Low-noise amplifiers are designed to minimize the additional noise. Designers minimize the additional noise by considering tradeoffs that include impedance matching, choosing the amplifier technology and selecting low-noise biasing conditions.
Low-noise amplifiers are found in radio communications systems, medical instruments, and electronic equipment. A typical low-noise amplifier may supply a power gain of 100 (20 dB) while decreasing the signal-to-noise ratio by less than a factor of two (a 3 dB noise figure). Although low-noise amplifiers are primarily concerned with weak signals that are just above the noise floor, they must also consider the presence of larger signals that cause intermodulation distortion. Consequently, low-noise amplifiers often do not have high gains.