Wireless RF front end circuit and wireless signal boosting device having the wireless RF front end circuit

A wireless signal boosting device, comprising:

• a casing;
• a connector configured to be connected to a cable;
• and
• a wireless radio frequency (RF) front end circuit, enclosed by the casing and connected to he connector, wherein the wireless RF front end circuit comprising:
• a first switch;
• a second switch, electrically connected to the first switch through a first path or a second path and electrically connected to the connector;
• an adjustable amplifier circuit, disposed in the first path between the first switch and the second switch;
• a detection circuit, connected to the first switch and the second switch and configured to detect a transmitting signal, wherein the detection circuit configures the first switch and the second switch to enable the first path and disable the second path in response to the transmitting signal has been detected;
• and
• a controller, electrically connected to the detection circuit and the adjustable amplifier circuit, wherein the controller adjusts a gain of the adjustable amplifier circuit, wherein
• the adjustable amplifier circuit comprises:
• a power amplifier;
• and
• a digital attenuator, electrically connected to the power amplifier and the controller, wherein the controller transmits a control signal to the digital attenuator to adjust the gain of the adjustable amplifier circuit.