Samsung Electronics Co., Ltd.

Jae-Sun Park

Sung-Soo Kim

Jie Liu

Jae-Min Seo

Jae-Min Lee

Joung-Kyou Park

Gin-Kyu Choi

Ji-Won Ha

Hyung-Weon Park

Hong-Kyu Kim

Seong-Won Cho

Eun-Joon Kim

Sung-Taek Kwon

Dae-Young Oh

Qichao Yan

Xieming Guo

Hong-Gyu Kim

Xingong Xu

Jiayan Liang

Kee-Dug Kim

Xuheng Liu

An apparatus and method configure a diversity antenna in a portable terminal. The apparatus includes a first antenna, a second antenna, a first communication unit for processing a first communication scheme signal communicated through the first antenna, a second communication unit for processing a second communication scheme signal communicated through the second antenna, and a control unit for configuring the first antenna as a diversity antenna for the second communication unit when the first communication unit is not driven.

Apparatus and method for providing diversity service antenna in portable terminal

A method for controlling power in a wireless telephone set is provided. The method includes controlling a power supply to a receiving section and a transmitting section by using a transmitting section turn-on signal to turn on the transmitting section, when the transmitting section turn-on signal is received in a slot mode for alternating between a receiving condition and a sleeping condition at predetermined intervals, and when the transmitting section turn-on signal is not received, controlling the power supply to the receiving section according to the receiving condition of slot mode control signals during the slot mode when no interrupting signal has been detected.

Method for controlling power in wireless telephone set

An antenna apparatus for a printed circuit board including an auxiliary antenna which includes a printed circuit board and mounting components. An antenna pattern is formed on the printed circuit board, and the antenna apparatus includes a first auxiliary antenna unit formed on an upper surface of the printed circuit board; and a second auxiliary antenna unit provided at a location on a lower surface of the printed circuit board that corresponds to location of the first auxiliary antenna unit on the upper surface of the printed circuit board. Efficiency by the antenna apparatus according to the present invention can be increased by approximately 17%.

Antenna apparatus for printed circuit board having auxiliary antenna

A method for controlling power in a wireless telephone set. The method includes the steps of detecting whether or not any interrupting signals have been generated and performing a user mode for supplying power only to sections necessary for operations according to an origin of the interrupting signals, when said interrupting signals are generated.

There is provided a control method for driving backlight parts to provide backlight to a display and a keypad in a mobile terminal. The display backlight part and the keypad backlight part are controlled to be selectively driven, according to the state of the cover and the presence or absence of key input data. Therefore, power dissipation caused by unnecessary operation of the backlights can be prevented.

Method for driving backlight parts in a mobile phone

A device for controlling a receiving amplifier in a radio terminal by monitoring the transmission/reception mode and varying the current to an amplifier that amplifies an output signal to vary the linearity of the amplifier according to a received signal strength indicator (RSSI) measured of the input signal and a measured input signal quality.

Device and method for controlling a receiving amplifier in a radio terminal

A device for controlling voltage in a power amplifier of a portable wireless terminal according to the present invention, includes a power amplifier adapted to adjust an amplification degree of a signal inputted in response to a supply state of a reference voltage to output the adjusted signal. The device also includes a comparator/limiter adapted to compare a value of a transmitting automatic gain controlled (TX_AGC) supply voltage and a value of an operating supply voltage to output the compared result and a power supply conversion section adapted to convert a state of the compared result outputted from the comparator/limiter into a reference voltage state for application to the power amplifier as a reference voltage thereof.

Device for controlling power in power amplifier of a portable wireless terminal

A device for linearizing a transmitter in a digital radio communication system. In the device, a predistortion lookup table stores predistortion data determined by measuring in advance distortion characteristics of the transmitter with respect to input baseband data. During transmission, the device synthesizes the input baseband data with the predistortion data to predistort the input data so as to compensate for the distortion characteristics caused by non-linear elements constituting the transmitter.

Device and method for linearizing transmitter in digital communication system

A power supply apparatus for a mobile communication terminal having voltage regulators, a receiver and baseband signal processor, a transmitter, a power amplifier, and a DC/DC converter for converting a DC voltage from a battery. In a reception mode of the mobile communication terminal, the power supply apparatus regulates the DC voltage converted by the DC/DC converter and supplies the regulated DC voltage to the receiver and baseband signal processor. In a transmission mode, the power supply apparatus converts the DC voltage to a DC voltage corresponding to a transmission AGC (Automatic Gain Control) voltage which is determined based on a transmission power. The converted DC voltage is then supplied to the receiver and baseband signal processor, the transmitter, and the power amplifier via the voltage regulators. The power supply apparatus has a single DC/DC converter and adaptively varies the output voltage of the DC/DC converter according to the transmission power in the transmission mode. A method is also provided for controlling a power supply voltage in a communication terminal capable of operating in a reception mode and in a transmission mode. The method comprises the steps of regulating a DC voltage converted by a DC/DC converter and supplying the regulated DC voltage to the receiver and baseband signal processor in the reception mode; and converting the DC voltage converted by the DC/DC converter to a DC voltage corresponding to a transmission AGC voltage determined according to a transmission power and supplying the converted DC voltage to the receiver and baseband signal processor, the transmitter, and the power amplifier in the transmission mode.

Power supply apparatus and method for controlling same in a mobile communication terminal

A receiver with suppressed intermodulation distortion for a radio communication terminal. In the receiver, a low noise amplifier for amplifying a received signal, has an operating power being increased in response to a first control signal to reduce an intermodulation distortion signal. An RF bandpass filter bandpass-filters the signals in a reception frequency band out of the signals output from the low noise amplifier. A mixer mixes an output of the RF bandpass filter with a local oscillation signal to generate an intermediate frequency signal by down-converting the output of the RF bandpass filter. An intermediate frequency amplifier for amplifying the intermediate frequency signal output from the mixer, and having an operating power being increased to reduce the intermodulation distortion signal in response to a second control signal. An intermediate frequency bandpass filter bandpass-filters an intermediate frequency signal out of the signals output from the intermediate frequency amplifier. A demodulator and signal processor demodulates and processes the intermediate frequency signal output from the intermediate frequency bandpass filter to generate an received signal strength indicator signal and a signal-to-noise ratio signal. A controller having a reference received signal strength indicator signal and a reference signal-to-noise ratio signal stored therein, compares the received signal strength indicator signal and the signal-to-noise ratio signal with the reference received signal strength indicator signal and the reference signal-to-noise ratio signal to determine whether a reception sensitivity is poor, and activates said first and second control signals if the reception sensitivity is poor. And one or more attenuators are provided to be controlled by the controller in response to the further comparisons made between the generated signal-to-noise ratio signal and the reference signal-to-noise ratio signal.

Receiver with suppressed intermodulation distortion and method for operating the same

A voltage controlled oscillator for upconverter/downconverter in a digital radio communication system has an improved phase noise characteristic and includes: a resonance unit wherein a variable capacitance component is parallel-connected to a series resonance circuit, the variable capacitance component having a capacitance inversely proportional to the level of a control voltage in a preset range and the series resonance circuit having a series resonance point corresponding to the level of a mode voltage, and an oscillating unit for oscillating at a frequency corresponding to a parallel resonance point determined by the resonance unit.

Voltage controlled oscillator for upconverter/downconverter in digital

A digital radio communication system includes a first down converter for converting down a predetermined radio frequency (RF) signal into a first intermediate frequency (IF) signal according to a first local oscillation signal; a second down converter for converting down the first IF signal into a second IF signal according to a second local oscillation signal; a demodulator for demodulating the second IF signal according to a third local oscillation signal and outputting a predetermined base band of a signal; a modulator for modulating the predetermined base band of signal according to the second local oscillation signal and outputting a third IF signal; a up converter for converting the third IF signal to a RF signal according to the first local oscillation signal; a first phase-locked loop (PLL) for controlling the first local oscillation signal in a direction where the sum of the frequency deviation between the first local oscillation signal and a reference frequency signal and the frequency deviation between the second local oscillation signal and the reference frequency signal is removed; and a second PLL for controlling the third local oscillation signal in a direction where the frequency deviation between the third local oscillation signal and the reference frequency signal is removed.

Digital radio communication system having reduced phase-locked loop, and

A transmission and reception method and apparatus is capable of supplying local oscillation frequencies for upconversion and downconversion, as well as carrier frequencies for modulation and demodulation by utilizing only one local oscillator. The apparatus includes a reference signal generator for generating a reference signal, and a phase locked loop for locking the output of the reference signal generator to a predetermined frequency. A signal generator generates a signal in response to the output provided from the phase locked loop, and provides the signal to phase shifters in modulation and demodulation circuits. A first frequency multiplier multiplies the output of the signal generator, a first band pass filter band pass filters the output of the first frequency multiplier, and a first amplifier amplifies the output of the first band pass filter and provides the amplified result to an upconversion mixer. A second frequency multiplier multiplies the output of the signal generator, a second band pass filter band pass filters the output of the second frequency multiplier, and a second amplifier amplifies the output of the second band pass filter and provides the amplified result to a downconversion mixer.

Transmission and reception apparatus having a single phase-locked loop

A PLL for improving a locking time in a radio communication system, includes: a storage unit for digitally storing a series of different control voltages; a digital/analog converter for converting a read control voltage into an analog control voltage; a voltage controlled oscillator oscillating at a frequency in accordance with a level of a supplied analog control voltage or signal; a variable divider for frequency dividing the voltage controlled oscillator output in accordance with a variable dividing ratio determined by a system operating mode; a phase comparator for comparing a phase of the variable divider output with an externally supplied reference signal, and for outputting a phase difference signal indicative of a comparison result; a low-pass filter low-pass for filtering the phase difference signal; a level detector for comparing a level of the low-pass filter output with a reference level, and for generating a digital comparison result signal; a controller for reading one of the series of stored control voltages using the level detector output supplied to the digital/analog converter, and for performing a read operation until the level detector output is within a predetermined range; and a switch for supplying the digital/analog converter output to the voltage controlled oscillator.

Phase locked loop for improving a phase locking time

A transmission-reception apparatus in a digital radio communication system for minimizing electrical interference within the apparatus by eliminating interference attributable to the use of different frequency generators. The transmission apparatus includes an antenna, a quadrature modulator for quadrature modulating first and second data to be input, an up-converter for increasing a frequency of the quadrature modulated signal to a transmission frequency band and then for supplying the resulting signal to the antenna, a reference frequency generator, a carrier frequency generator for generating a carrier frequency for modulation by being phase-locked with the reference frequency generator, and a frequency multiplier for generating a respective local oscillation frequency for up-conversion by multiplying the carrier frequency by a predetermined positive number. Up-conversion of the quadrature-modulated signal can be performed in a single stage or in a plurality of stages.

Growing community of inventors

Suwon-shi, South Korea

Jae-Sun Park