radio frequency transmitter

Abstract

The invention provides a wireless radio frequency transmitter. The wireless radio frequency transmitter comprises a baseband processor, a digital-to-analog converter, a low-pass filter, a voltage-controlled oscillating circuit, a fractional frequency division circuit and a mixer, wherein the baseband processor is used for modulating data to be transmitted to form a baseband modulation signal; thedigital-to-analog converter is used for performing digital-to-analog conversion on the baseband modulation signal; the low-pass filter is used for performing low-pass filtering on the baseband modulation signal being subjected to the digital-to-analog conversion; the voltage-controlled oscillating circuit is used for generating a reference clock signal; the fractional frequency division circuit isused for performing fractional frequency division on the reference clock signal to generate a local oscillation signal; and the mixer is used for performing up-conversion on the baseband modulation signal being subjected to low-pass filtering according to the local oscillation signal to form a radio frequency transmission signal. Through adoption of the radio frequency transmitter, the influenceof integer harmonics of the local oscillation signal on the voltage-controlled oscillation circuit is lowered greatly. Compared with the prior art, the wireless radio frequency transmitter has the advantage that the influence of integer harmonics of the local oscillation signal on the voltage-controlled oscillation circuit is lowered greatly.

Description

【Technical field】 [0001] The invention relates to the technical field of electronic circuits, in particular to a radio frequency transceiver. 【Background technique】 [0002] A radio frequency transceiver consists of a transmitter (TX) and a receiver (RX). The transmitter (TX) processes the modem (MODEM) signal and transmits it through the antenna (ANTENNA); the receiver (RX) receives the antenna signal, and then performs amplification, frequency conversion, filtering, digitization, etc. and then sends it to the modem (MODEM). [0003] With the development of communication technology, more and more information is transmitted within the same bandwidth, and the requirements for wireless transceivers are correspondingly more and more complex. The local oscillation signal generating circuit of the general traditional transmitter structure includes a radio frequency voltage-controlled oscillation circuit, an integer frequency division circuit and a local oscillation signal buffer...

AI Technical Summary

Problems solved by technology

The local oscillation signal generation circuit of the general traditional transmitter structure includes a radio frequency voltage-controlled oscillation circuit, an integer frequency division circuit and a local oscillation signal buffer circuit; since the integer multiple harmonics of the local oscillation signal will be at the VCO frequency of the voltage-controlled oscillation circuit, it will be pulling on it destroys its phase noise

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