A circuit for improving dynamic range of receiver, transceiver and front-end circuit of nxn WLAN radio frequency transceiver

Abstract

The invention discloses a circuit improving receiver dynamic range. The circuit comprises a variable voltage controller. The voltage output end of the variable voltage controller is connected with a power supply end of a low-noise amplifier. The variable voltage controller is controlled by a normal mode control signal of a receiving link and a bypass mode control signal of a receiving link. When the normal mode control signal of the receiving link is enabled, the variable voltage controller outputs a standard voltage level, and the low-noise amplifier works normally; when the bypass mode control signal of the receiving link is enabled, the variable voltage controller outputs a low voltage level to adjust the gain of the low-noise amplifier. The circuit can prevent attenuation loss of the signal, the circuit structure is simplified, and the circuit area and the manufacture cost are saved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a circuit for improving the dynamic range of a receiver, a transceiver containing the circuit, and a front-end circuit of an NxN WLAN radio frequency transceiver. Background technique [0002] The WLAN (Wireless Local Area Network, WLAN) receiver is mainly used to process the signal received by the antenna, and down-convert the received RF signal to a base frequency signal suitable for analog circuit processing. Sensitivity, selectivity, dynamic range, etc. are all factors that measure the performance of a receiver. Among them, if the receiver has a good dynamic range, the system can have a larger operating range for receiving signal strength. [0003] In order to achieve the characteristics of high dynamic range, the existing receiver controls the attenuation by switching the switch through the control signal. When the signal strength is too high, it switches to the bypass...

AI Technical Summary

Problems solved by technology

[0004] The design of the bypass circuit of the receiving link Rx is to attenuate the received signal by using a circuit with high attenuation, and then import it into the circuit of the subsequent stage for signal processing. Therefore, in practical applications, an additional single-pole double-throw switch (SinglePole Double Throw, SPDT), Single Pole Triple Throw (Single Pole Triple Throw, SP3T) and high attenuation network High Attenuation Networking to achieve the purpose, such as figure 1 , figure 2 As shown, but this multi-input multi-output circuit architecture will increase the complexity of the circuit, which is not conducive to system integration

For example, in the NxN WLAN radio frequency transceiver front end, if each receiving link Rx adopts a functional radio frequency module with a bypass mode of the receiving link Rx, it will make the entire circuit structure quite complicated, occupy a large circuit area, and increase the manufacturing cost. cost

[0005] also, figure 2 In the structure in the receiving chain Rx, the bypass mode and the normal mode of the receiving chain Rx share the low-noise amplifier (Low-Noise Amplifier, LNA), resulting in waste of power consumption. If the received signal is too large, the low-noise amplifier LNA It will be saturated and distorted, and finally affect the quality of the overall received signal

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