A frequency offset calibration method for a two-point wireless transmitter

Abstract

The invention discloses a two-point wireless transmitter and a frequency offset correcting method of the two-point wireless transmitter. Improvement is conducted based on a circuit structure of a traditional two-point transmitter, and frequency offset correction is achieved by conducting data interaction by means of two wireless communication chips which have the complete functional design and are successfully taped out. During implementation, the two chips are respectively provided with a microcontroller, a register, a transmitting module, a receiving module, an antenna and a change-over switch; transmitted data are input to the wireless transmitter through two paths, one path of data are input to a voltage-controlled oscillator through a branch switch S2 of the first chip and a DAC to be transmitted in an out-band mode, and the other path of data are input to a multi-mode frequency divider through a branch switch S1 of the first chip and a delta-sigma modulator for modulation and frequency division and then are transmitted in an in-band mode. According to the two-point wireless transmitter and the frequency offset correcting method of the two-point wireless transmitter, through the data interaction between the two chips and software processing of the microcontroller of the first chip, the frequency offset of the transmitted data can be corrected effectively, and high-quality smooth transmission of data is achieved; the two-point wireless transmitter and the frequency offset correcting method of the two-point wireless transmitter have the advantages that energy consumption is low, the number of hardware resources is small, cost is low and stability is high.

Description

technical field [0001] The invention relates to a wireless communication device, in particular to a wireless transmitter suitable for high-quality transmission in any data rate occasion with low energy consumption and low cost. Background technique [0002] At present, there are three main types of direct transmitters based on phase-locked loops commonly used: figure 1 Shown is an out-of-band transmitter based on a phase-locked loop, figure 2 Shown is an in-band transmitter based on a phase-locked loop, image 3 Shown is a two-point transmitter based on a phase-locked loop. [0003] The analysis circuit shows that the main disadvantages of the out-of-band transmitter based on the phase-locked loop: (1) Due to the low-pass characteristic of the loop filter of the phase-locked loop, the transmitter transmits out-of-band, supports high data rates, and does not support low The data rate is transmitted, so it will limit the application of the transmitter. (2) Since the trans...

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Problems solved by technology

[0008] Considering the above-mentioned deficiencies and requirements of the existing wireless transmitters based on phase-locked loops, the present invention proposes a frequency offset calibration method for a two-point wireless transmitter to solve the hardware resource consumption during the traditional two-point wireless transmitter frequency offset calibration Large, high power consumption problems, while improving the quality of data transmission

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