Detection circuit and terminal

Abstract

The invention discloses a detection circuit and a terminal. The detection circuit comprises a radio frequency transmitting-receiving module, a coupling module and a detecting module. The coupling module is connected with the radio frequency transmitting-receiving module and the detecting module. The coupling module comprises a coupling resistor and a switching unit. One end of the coupling resistor is connected with the radio frequency transmitting-receiving module while the other end is connected with the input end of the switching unit. The output end of the switching unit is connected with the detecting module. When the received signal strength of the radio frequency transmitting-receiving module is detected, the input end and the output end of the switching unit are connected. The coupling module makes the radio frequency signals received by the radio frequency transmitting-receiving module coupled to the detecting module so that the detecting module can detect the received signal strength of the radio frequency transmitting-receiving module. After the received signal strength of the radio frequency transmitting-receiving module is detected, the input end and the output end of the switching unit are disconnected. The above-mentioned scheme can make radio frequency signal attenuation caused by the coupling module alleviated. The detection precision and the receiving sensitivity can be further improved.

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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