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.