Low-power consumption and low-noise amplifier adopting noise cancellation technology

Abstract

The invention provides a low-power consumption and low-noise amplifier adopting a noise cancellation technology. The amplifier comprises a balanced-unbalanced transformer (1), a capacitance cross coupling common-gate amplification stage (2), a feedforward noise cancellation stage (3), a main common-gate amplification stage (4) and a load impedance (5). A mode of cascading the capacitance cross coupling common-gate amplification stage with the main common-gate amplification stage is adopted to enhance transconductance twice, and the higher equivalent transconductance is realized through low power consumption; the noise contribution of the capacitance cross coupling common-gate amplification stage can be reduced through the feedforward noise cancellation stage; and the noise contribution of the main common-gate amplification stage can be inhibited through the gains provided by the capacitance cross coupling common-gate amplification stage and the feedforward noise cancellation stage. The twice transconductance enhancement and a feedforward noise cancellation technology are combined together so as to realize low noise factor and low power consumption.

Description

technical field [0001] The invention relates to a low-power low-noise amplifier using noise canceling technology, which has the characteristics of low noise figure and low power consumption, and belongs to the technical field of radio frequency integrated circuits. Background technique [0002] The low noise amplifier is the key module of the receiver in the wireless transmission system. It is generally connected to the antenna to amplify the received weak signal and minimize the deterioration of the signal. Port matching, gain, noise figure, power consumption and linearity are the main technical parameters of LNAs. [0003] Traditional low-noise amplifiers use source-level inductive feedback technology, which can provide narrow-band input matching and low noise figure, but this structure requires on-chip inductors and is not suitable for broadband systems. Low-noise amplifiers using noise-cancelling techniques can achieve lower noise figures in wideband, but consume more p...

AI Technical Summary

Problems solved by technology

[0007] The technical problem of the present invention is to overcome the deficiencies of the prior art, and provide a low-power low-noise amplifier using noise cancellation technology. Through the combination of transconductance secondary enhancement and feed-forward noise cancellation technology, low noise figure and Low power consumption, solving the problem of high noise figure of existing low power common gate low noise amplifiers

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