Abstract: Various embodiments associated with a DCXO installed in an electronic device are described. An electronic device may include: a frequency determining unit configured to determine a delta frequency corresponding to a difference between a first frequency for RF communication and a second frequency output from a frequency synthesis unit; a digitally-controlled crystal oscillator (DCXO) configured to comprise a plurality of capacitors including a first variable capacitor and a second variable capacitor, and an oscillator connected to the plurality of capacitors and outputting a clock; and a processor configured to change capacitances of the first variable capacitor and the second variable capacitor by applying a first control value to the first variable capacitor and applying a second control value to the second variable capacitor, based on the delta frequency. Other various embodiments may be possible.

Abstract: An apparatus and method for non-calibrated Automatic Frequency Correction (AFC) of a portable terminal are provided. The method includes identifying, by the portable terminal, signal strengths of signals received from neighboring base stations of a cell in which the portable terminal is currently located; searching for a frequency burst serving that provides synchronization acquisition information for synchronization with a base station; determining to perform the AFC according to a result of the searching for the frequency burst; and storing AFC data extracted through the AFC.

Abstract: An apparatus and method for non-calibrated Automatic Frequency Correction (AFC) of a portable terminal are provided. The method includes identifying, by the portable terminal, signal strengths of signals received from neighboring base stations of a cell in which the portable terminal is currently located; searching for a frequency burst serving that provides synchronization acquisition information for synchronization with a base station; determining to perform the AFC according to a result of the searching for the frequency burst; and storing AFC data extracted through the AFC.

Abstract: A device and method for controlling radio-frequency power in a wireless terminal are provided, by which radio-frequency power transmitted from the wireless terminal to a base station is flexibly controlled and transmitted.

Abstract: A device and method for synthesizing a transmission frequency (a Tx frequency) in a wireless terminal are provided, which are designed for stably operating a Phase Locked Loop (PLL) in order to synthesize a Tx frequency for a certain channel.

Abstract: A device and method for synthesizing a transmission frequency (a Tx frequency) in a wireless terminal are provided, which are designed for stably operating a Phase Locked Loop (PLL) in order to synthesize a Tx frequency for a certain channel.

Abstract: A device and method for controlling radio-frequency power in a wireless terminal are provided, by which radio-frequency power transmitted from the wireless terminal to a base station is flexibly controlled and transmitted.