Circuit for attenuating signal received through antenna to improve SNR, electronic device including the same, and method for controlling the same

A method of controlling radio frequency front end (RFFE), the method comprising:

• determining a first receiving power of a first RF signal received through an antenna;
• determining a second receiving power of a second RF signal received through the antenna;
• controlling at least one transistor included in an attenuator circuit such that a signal output from an amplifier circuit is directly transferred to a mixer in response to determining the first receiving power is less than a threshold value, the signal output from the amplifier circuit being the first RF signal amplified by the amplifier circuit;
• controlling the at least one transistor using a look-up table in response to determining the second receiving power is greater than or equal to the threshold value, the controlling causing the attenuator circuit to have a resistance value corresponding to the second receiving power;
• and
• controlling a gain of the amplifier circuit to have a gain value corresponding to the first receiving power using the look-up table.

An electronic device comprising:

• an amplifier circuit configured to amplify an RF signal received through an antenna;
• an attenuator circuit including a plurality of resistors and a plurality of transistors, the plurality of resistors being connected between the amplifier circuit and a mixer, and each respective transistor among the plurality of transistors being connected in parallel with a corresponding resistor among the plurality of resistors;
• and
• a processor electrically connected to the attenuator circuit and the amplifier circuit, the processor being configured to
• turn off at least one among the plurality of transistors using a look-up table based on a receiving power of the RF signal being greater than or equal to a threshold value, the amplifier circuit and the mixer being connected through at least one among the plurality of resistors based on the at least one among the plurality of transistors being turned off, a combined resistance of the at least one among the plurality of resistors corresponding to the receiving power, and
• control a gain of the amplifier circuit to have a first gain value corresponding to the receiving power using the look-up table.