A radio frequency receiving circuit and radio frequency receiver

Abstract

The invention belongs to the technical field of communication, and in particular relates to a radio frequency receiving circuit, which includes a tail current source, which is multiplexed to access radio frequency signals and amplify the radio frequency signals to generate radio frequency current; a clock signal input unit , connected with the tail current source, for inputting a clock signal; a sample-and-hold unit, connected with the clock-signal input unit, outputting a quadrature signal whose frequency is 1 / 2 of the clock frequency; a load unit, connected with the sample-and-hold The unit is connected, the radio frequency current flowing through the load unit is converted into a voltage and modulated by the quadrature signal, and the output frequency is an intermediate frequency signal whose frequency is the difference between the frequency of the radio frequency signal and the frequency of the quadrature signal, thereby realizing mixing. It not only realizes the traditional orthogonal signal generation function, but also amplifies and mixes the input radio frequency signal, and realizes the multiplexing of the divide-by-two circuit.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a radio frequency receiving circuit and a radio frequency receiver. Background technique [0002] With the rapid development of modern communication systems, the communication industry has become an industry with a wide market audience, and the application of communication systems has penetrated into every corner of society. As a basic module in communication systems, radio frequency receivers have also been widely used. Its performance (including power consumption / area / noise figure and linearity) improvement and potential exploration have also become a continuous and challenging research hotspot. [0003] In mobile communication, in order to extend the standby time, reducing receiver power consumption has always been a hot research topic. The receiver of the traditional structure includes a low noise amplifier (LNA) / mixer (Mixer) / quadrature local oscillato...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a radio frequency receiving circuit, which realizes the amplification and mixing functions of radio frequency signals by multiplexing the SCL divider by two, and aims to solve the problems of large output power consumption and large chip area in the traditional technical solution The problem

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