Low noise amplifier for current reuse and noise cancellation

Abstract

The invention discloses a low noise amplifier for current reuse and noise cancellation. The amplifier comprises a common-source amplifier, a common-gate amplifier, a signal isolation and current reuse network and an off-chip receiving network, wherein the common-source amplifier comprises a first N-type metal oxide transistor, a first resistor, a third resistor, a first capacitor and a sixth capacitor; the common-gate amplifier comprises a second N-type metal oxide transistor, a second resistor, a second capacitor and a fifth capacitor; the signal isolation and current reuse network comprises a first resonant network and a second resonant network; the first resonant network consists of a first inductor and a third capacitor; the second resonant network consists of a second inductor and a fourth capacitor; and the off-chip receiving network comprises a second inductor, a signal source of an artificial antenna and an antenna internal resistor. The low noise amplifier in such a structure has a noise cancellation function and simultaneously reuses the static bias current of the common-gate amplifier and the common-source amplifier, thereby having a low noise coefficient and a low power consumption function.

Description

technical field [0001] The invention relates to an amplifier, in particular to a current multiplexing noise canceling low noise amplifier. Background technique [0002] In the RF signal receiving chain, the low-noise amplifier is the first-stage active circuit of the receiver, which itself has a very low noise figure and provides sufficient gain. Considering the entire receiving chain, the low noise amplifier should have a higher gain to suppress the influence of the noise of the subsequent RF circuit and the intermediate frequency circuit on the noise figure of the entire receiving chain. In addition, the low noise amplifier itself should have a low noise figure to reduce the design pressure of the mixer. As multi-carrier technology and complex modulation technology are more and more applied to wireless communication, the requirements for various performance parameters of the receiver are gradually increasing. Due to the limitation of the cut-off frequency of MOS transist...

AI Technical Summary

Problems solved by technology

The high gain is generally at the cost of DC current or power consumption. Therefore, this compromise leads to an increase in the DC bias current of the two branches.

In a resistive load configuration, the voltage drop generated by the large bias current is added to the load resistance and is therefore wasted

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