A Bluetooth baseband receiving system and its realization method

Abstract

The application discloses a bluetooth baseband receiving system, which includes an antenna, a bluetooth radio frequency receiving module, a digital front end and a modem. In the Bluetooth radio frequency receiving module, the signal received by the antenna is first amplified by analog gain by the low noise amplifier, then by the variable gain unit for variable gain amplification, and then by the analog-to-digital conversion unit for analog-to-digital conversion; the control logic coordinates the control Gain values ​​for low noise amplifiers and variable gain units. In the digital front end, the signal after analog-to-digital conversion is amplified with a fixed gain by a fixed gain adjustment unit, and then sent to the modem. The application provides a digital logic implementation scheme that can quickly lock the gain of the Bluetooth radio frequency signal; omits the microcontroller that controls the gain in the digital front end; reduces the time for locking the gain of the Bluetooth radio frequency signal, and can obtain high-precision analog The output signal after digital conversion finally improves the performance of Bluetooth baseband demodulation.

Description

technical field [0001] The present application relates to a bluetooth baseband receiving system, in particular to a gain adjustment scheme therein. Background technique [0002] With the outbreak of the Internet of Things, more and more Bluetooth terminal devices work in the license-free 2.4GHz frequency band. The noise caused by mutual signal interference makes the channel environment more and more complicated. Bluetooth terminal devices face more challenges in improving performance. challenge. With the improvement of chip technology, it is becoming easier to run more complex logic on a smaller area. In the face of more complex channel interference environments, we can use more complex digital logic to deal with it, but correspondingly need to pay corresponding at the expense of power consumption. The power consumption of Bluetooth terminal equipment has always been a sensitive parameter that users are very concerned about. In order to control power consumption, the loss ...

AI Technical Summary

Problems solved by technology

Generally, the software part of the control logic 18 is solidified into an RTL (register transfer level) circuit, and the solidified RTL circuit is difficult to cope with the flexible and changeable control logic

Images