Low-power-consumption bidirectional noise-reducing low-noise amplifier

Abstract

The invention provides a low-power-consumption bidirectional noise-reducing low-noise amplifier and aims to provide the low-power-consumption bidirectional noise-reducing low-noise amplifier which has advantages of low noise coefficient, high reliability and stable gain, wherein the low-power-consumption bidirectional noise-reducing low-noise amplifier can eliminate a common-gate-tube channel thermal noise and reduce a common-source-tube channel thermal noise and a common-source-end load resistor thermal noise. The low-power-consumption bidirectional noise-reducing low-noise amplifier is realized through a technical solution which is characterized in that an impedance down-conversion network is parallelly connected with a common-source-electrode amplifying circuit with a feedback resistor through a common-gate-electrode amplifying circuit, thereby forming a single-end-input double-end-output low-noise amplifying circuit, wherein a common-gate-electrode input amplifying circuit is composed of an MOS tube M1, a serially connected MOS tube M3, and a load resistor R1 which is serially connected between the drain electrode of the MOS tube M3 and a power supply VDD. A common-source-electrode input amplifier circuit is composed of a capacitor C3 which is connected with the source electrode of an MOS tube M2, an MOS tube M4 which is serially connected with the MOS tube M2, a feedback resistor R3 which is parallelly connected between the gate electrode of the MOS tube M2 and the drain electrode of the MOS tube M4, and a load resistor R2 which is serially connected between the drain electrode of the MOS tube M4 and the power supply VDD.

Description

technical field [0001] The invention relates to a radio frequency integrated low noise amplifier in a radio frequency receiver in the field of wireless communication, in particular to a low noise amplifier using bidirectional noise reduction technology. Background technique [0002] The low noise amplifier is an important part of the receiver in the wireless communication system. Its parameters such as noise and gain directly affect the performance indicators such as the noise figure and sensitivity of the receiver. In the receiving system, it is always at the front end. It mainly amplifies the weak signal received by the whole system and reduces the interference of noise, which restricts the performance of the whole receiving system. The low-noise amplifier plays a decisive role in the noise characteristics of the whole system, which requires its noise figure to be as small as possible. In order to suppress the impact of noise on the system at various levels behind, it is ...

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Problems solved by technology

2. It is difficult for wideband low noise amplifiers to meet low noise requirements

However, for the traditional common-gate-cascode noise reduction structure LNA, it is difficult to directly reduce the current of the common-gate tube, because the common-gate tube needs to provide 50 ohm input impedance matching; at the same time, the transconductance of the common-source tube The value also needs to be set to a higher value to achieve the effect of suppressing its noise, but this will cause the common source tube to consume too much current and consume too much power

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