Another design goal for the circuit is the unconditional stability of the low-noise amp. Internal feedback of the transistor and excessive gain at the out-of-band frequencies are the primary causes of ...

If you know or can estimate a low-noise amplifier’s gain or noise bandwidth, you can measure the other spec using only a handful of resistors and an ac voltmeter (Reference 1). The method in this ...

[Limpkin] therefore designed an amplifier and signal buffer to crank up the noise signal by a factor of 100, using ultra-low noise op amps running off a pair of nine-volt batteries.

[Will] recently tipped us about a 400MHz Low Noise Amplifier (LNA) module he made. His detailed write-up starts by explaining the theory behind an amplifying chain. Assuming a 50 Ohm antenna system… ...

The topic remains “out of sight” until you are working with a low-noise, low-gain circuit that seems to have excessive amounts of noise. The amplifier is set up as a unity gain buffer (Fig. 1).

The output-noise spectral density of the amplifier is shown in Figure 2. At high frequencies, it is limited by the Johnson noise of the feedback network (chosen to be as low as 10 kΩ).

All parts of the design such as semiconductor layers, components, process and circuit design have been optimised for the lowest noise performance. 0.5-13GHz integrated amplifier with ultra-low-noise ...

A fundamental property for the first microwave amplifier in the radio receiver is its noise figure, which is normally given in decibels (dB). A typical noise figure for low-noise amplifiers in mobile ...