Adaptive Sampling Method of Analog-to-Digital Converter for Improving RF Receiver Sensitivity Attenuation

Abstract

The invention relates to the technical field of radio frequency receivers, and discloses an adaptive sampling method of an analog-to-digital converter for improving the sensitivity attenuation of radio frequency receivers. The sampling frequency of the converter is equal to the frequency of the digital demodulator; in channels that are not affected by the high-order frequency wave of the analog-to-digital converter, the sampling frequency of the analog-to-digital converter and the working frequency of the digital demodulator are fixed; For the channel affected by the high-order frequency wave of the converter, switch the sampling frequency of the analog-to-digital converter and the operating frequency of the digital demodulator to f LO / N, where f LO is the local oscillator signal frequency, N=f RF / f ADC_CLK , f RF is the channel center frequency, f ADC_CLK It is the working frequency with optimal performance of the digital demodulator. The scheme of the present invention makes the analog-to-digital converter and the digital demodulator work at the optimal frequency according to whether the channel is affected by the high-order harmonic of the operating frequency of the analog-to-digital converter; or adjusts the operating frequency to avoid the sensitivity of the channel attenuation.

Description

technical field [0001] The invention relates to the technical field of radio frequency receivers, in particular to an adaptive sampling method of an analog-to-digital converter for improving the sensitivity attenuation of radio frequency receivers, and relates to a wireless communication system on chip (SOC). Background technique [0002] A communication protocol usually contains many channels. For example, the working frequency range of the Bluetooth communication protocol is 2402-2480MHz, which contains a total of 79 signals, and each channel is separated by 1MHz. Although the working frequency of the low-power Bluetooth communication protocol is also 2402-2480MHz, it only includes 40 channels, and each channel is spaced at 2MHz. In actual work, the two sides of the communication switch channels synchronously according to the agreement or according to certain rules, so as to avoid the disadvantage of being easily interfered by a fixed-frequency high-power signal when work...

AI Technical Summary

Problems solved by technology

In order to maintain optimal demodulation performance, special compensation is required, which leads to complex design and wastes a certain amount of chip area

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