Wideband low noise amplifier

Abstract

Disclosed is a broadband low-noise amplifier which is a low noise amplifier used to amplify broadband radio frequency signals and a broadband input matching design method. The low noise amplifier comprises a differential amplifier unit(10), an output unit(20), a feedback unit(30). The amplifier adopts a differential structure and employs a parallel-parallel negative feedback structure to realize input impedance matching within the broadband so as to optimize the noise performance of the circuit, and meanwhile, the feedback circuit provides DC offset to an input transistor, thus combining the functions of feeding back the alternating current and providing DC offset, making a DC operating point more stable.

Description

technical field [0001] The invention relates to a broadband low noise amplifier in a radio frequency receiver, in particular to a negative feedback broadband matching method. Background technique [0002] In the radio frequency receiver of the wireless communication system, after the radio frequency signal is received by the antenna, passes through the frequency band gating filter, and then enters the radio frequency receiver chip. In the RF receiver chip, the low-noise amplifier is generally located at the forefront of the receiver to achieve good input impedance matching, while providing moderate gain to amplify the RF signal, and suppressing the contribution of the subsequent circuit modules to the overall system noise. The low-noise amplifier must achieve good impedance matching with the off-chip filter. Ideally, a 50Ω pure resistance is provided to avoid or reduce power loss during signal transmission. Therefore, input impedance matching is an item of the low-noise ampl...

AI Technical Summary

Problems solved by technology

But its gain and noise performance is not good

It can be overcome by increasing the feedback resistor, but it also brings the problem of high power consumption

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