High-speed low power consumption 16QAM (Quadrature Amplitude Modulation) emitting device

Abstract

The invention discloses a high-speed low power consumption 16QAM (Quadrature Amplitude Modulation) emitting device which comprises a phaselocked loop frequency synthesizer, a four-dividing frequency divider, a first selected four phase gate I, a first selected four phase gate II, a phase demodulator, a variable gain power amplifier and a 16QAM digital demodulator, wherein the output end of the phaselocked loop frequency synthesizer is connected with the input end of the four-dividing frequency divider; the input end of the four-dividing frequency divider is connected with the output end of the phaselocked loop frequency synthesizer; the input end of the first selected four phase gate I is connected with the output end of the four-dividing frequency divider; the input end of the first selected four phase gate II is connected with the output end of the four-dividing frequency divider; the input end of the phase demodulator is respectively connected with the output ends of the first selected four phase gates, the phase demodulator is used for generating a phase demodulated signal and driving the variable gain power amplifier; the input end of the variable gain power amplifier is connected with the output end of the phase demodulator; the variable gain power amplifier is used for generating two different kinds of signal amplitudes and driving an antenna ohm load; and the output end of the 16QAM digital demodulator is respectively connected with the input ends of the first selected four phase gate, the phase demodulator and the variable gain power amplifier, and the 16QAM digital demodulator is used for carrying out serial parallel conversion on serially input baseband data and forming four parallel data required by the 16QAM demodulation.

Description

technical field [0001] The invention relates to the technical field of radio frequency transmitter chips, in particular to a high-speed ultra-low power consumption 16 quadrature amplitude modulation (QAM) transmitting device. Background technique [0002] In applications such as wireless body sensor networks, medical wireless imaging, and medical wireless implants, wireless transceivers undoubtedly play an extremely important role. In these applications, very demanding requirements are placed especially on the wireless transmitter. First of all, its power consumption must be very low to prolong the service life of the battery, because in many applications, it will be very expensive or even impossible to replace the battery. Secondly, the transmitter is required to have a very high data rate, so that the physiological information or environmental information in the human body can be sent to the external base station or server in real time in image format; thirdly, while requ...

AI Technical Summary

Problems solved by technology

Therefore, the transmitter with I / Q two-way frequency conversion structure is not suitable for applications with extremely low power consumption

At the same time, because the I / Q two channels are affected by mismatch and parasitic effects, the transmission rate is limited, otherwise the transmission vector error (EVM) will be unacceptable, so the traditional transmitter structure cannot meet the requirements of high-speed ultra-low power consumption

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