A self-reconfigurable return mixer

Abstract

A self-reconfigurable returnable mixer includes a self-reconfigurable transconductance stage. The input RF voltage signal is converted into RF current through the self-reconfigurable transconductance stage. The RF current is converted into an IF signal through down-conversion and low-pass filtering. The IF signal is fed back to the reconfigurable transconductance stage; the self-reconfigurable transconductance stage presents an open-loop structure to the input RF voltage signal, and the self-reconfigurable transconductance stage presents the topology structure of the negative feedback amplifier to the fed-back IF signal. The self-reconfigurable transconductance stage circuit achieves a high-linearity IF gain while providing a high bandwidth for the RF signal, effectively alleviating the contradiction between the conversion gain and the IF linearity in the conventional returnable structure.

Description

technical field [0001] The invention relates to a self-reconfiguration return type mixer, which belongs to the mixer technology. Background technique [0002] In the RF receiving system, the mixer is responsible for converting the RF signal to the baseband or intermediate frequency band. It is the core module in the receiving chain. considerable share. Therefore, in order to realize the low power consumption of the whole receiving circuit, it is very critical to optimize the power consumption design of the mixer. In addition, the mixer needs to have a high enough conversion gain to suppress the impact of the high noise figure of the IF module on the entire receiving chain. [0003] In view of the above background, a new structure called return mixer has been proposed and applied in recent years. The main idea of ​​the return mixer is to multiplex the RF transconductance stage, which is used to amplify the RF signal and the intermediate frequency signal after frequency con...

AI Technical Summary

Problems solved by technology

This structure also plays a role in amplifying the intermediate frequency signal. Due to the limitation of its own open-loop structure, the linearity of the intermediate frequency signal is severely restricted.

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