A detection circuit and terminal

Abstract

The application discloses a detection circuit and a terminal. Wherein, the detection circuit includes a radio frequency transceiver module, a coupling module and a detection module, the coupling module is connected to the radio frequency transceiver module and the detection module, the coupling module includes a coupling resistor and a switch unit; one end of the coupling resistor is connected to the radio frequency transceiver module, and the other end of the coupling resistor is connected to the switch The input terminal of the unit and the output terminal of the switch unit are connected to the detection module; when the received signal strength of the radio frequency transceiver module is detected, the input terminal of the switch unit is connected to the output terminal of the switch unit, and the coupling module receives the radio frequency signal received by the radio frequency transceiver module Coupled to the detection module, so that the detection module can detect the received signal strength of the radio frequency transceiver module; when the received signal strength of the radio frequency transceiver module is detected, the input terminal of the switch unit is disconnected from the output terminal of the switch unit. The foregoing solution can reduce radio frequency signal attenuation caused by the coupling module, and improve detection accuracy and receiving sensitivity.

Description

technical field [0001] This application relates to the field of communications, in particular to a detection circuit and a terminal. Background technique [0002] In radio frequency circuits or wideband time slot detection, detection circuits are usually included, such as figure 1 As shown, the detection circuit includes a radio frequency transceiver module 110 , a coupling module 120 and a detection module 130 . The coupling module 120 is connected to the radio frequency transceiver module 110 and the detection module 130 respectively. The radio frequency transceiver module 110 is used for transmitting radio frequency signals; The coupling module 120 is used for coupling the radio frequency signal received by the radio frequency transceiver module 110 to the detection module 130; The detection module 130 is used for detecting the received signal strength (Received Signal Strength Indication) of the radio frequency transceiver module 120 , RSSI). [0003] Wherein, the cou...

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Problems solved by technology

However, by such figure 2 The coupling degree and signal attenuation curve of the coupling module 120 shown in the figure shows that when this coupling method is adopted, the coupling degree of the coupling module 120 will change with the change of the frequency, and the fluctuation range of the coupling degree exceeds 30dB, thus causing the detection module 130 The RSSI detected at different frequencies is different, and the measurement error is relatively large; moreover, the coupling module 120 also causes relatively large signal attenuation, reducing the receiving sensitivity

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