公开(公告)号：CA2559169A1

公开(公告)日：2005-09-22

申请号：CA2559169

申请日：2005-03-10

Applicant: GCT SEMICONDUCTOR INC

Inventor： PARK JOONBAE ,  LEE SEUNG-WOOK ,  LEE JEONG-WOO ,  LEE KYEONGHO

IPC: H03F3/45 ,  H03F1/32 ,  H03F3/21 ,  H04B1/40

Abstract: A variable-gain amplifier circuit uses a pair of single-ended operational amplifiers to amplify complementary portions of a differential input signal. By using two single-ended amplifiers instead of a single differential amplifier, linearity is significantly improved. In addition, common mode feedback circuitry is eliminated along with harmonic distortion and other forms of noise which tend to negative affect the quality of the signal output from the circuit.

公开(公告)号：CA2555468A1

公开(公告)日：2005-09-09

申请号：CA2555468

申请日：2005-01-13

Applicant: GCT SEMICONDUCTOR INC

Inventor： LEE KANG YOON ,  LEE KYEONGHO ,  LEE JEONG-WOO ,  KOO YIDO ,  PARK JOONBAE

IPC: H03B5/00 ,  H03L7/085 ,  H03L7/099 ,  H03L7/197 ,  H03L7/199

Abstract: Tuning methods and apparatuses for LC oscillators are disclosed. Embodiments of the present invention include an adaptively controlling the bit~compariso n time to provide the smallest coarse tuning time. The bit comparison time is scaled inversely to the amount of redundancy of corresponding weighted capacitors in a capacitor array of the LC oscillator.

公开(公告)号：AU2003284893A1

公开(公告)日：2004-05-25

申请号：AU2003284893

申请日：2003-10-23

Applicant: GCT SEMICONDUCTOR INC

Inventor： AHN YOUNGHO ,  SONG EUNSEOK ,  KOO YIDO ,  LEE JEONG-WOO ,  PARK JOONBAE ,  LEE KYEONGHO

IPC: H03L7/197

Abstract: A system and method for improving the signal-to-noise ratio of a frequency generator suppresses phase noise and noise generated from mismatches in the internal generator circuits. This is accomplished using a modulation scheme which shifts spurious noise signals outside the loop bandwidth of the generator. When shifted in this manner, the noise signals maybe removed entirely or to any desired degree using, for example, a filter located along the signal path of the generator. In one embodiment, a Sigma-Delta modulator controls the value of a pulse-swallow frequency divider situated along a feedback path of a phase-locked loop to achieve a desired level of noise suppression. In another embodiment, a reference signal input into a phase-locked loop is modulated to effect noise suppression. In another embodiment, the foregoing forms of modulation are combined to accomplish the desired frequency shift. Through these modulation techniques, the signal-to-noise ratio of the frequency generator may be substantially improved while simultaneously achieving faster lock times.

公开(公告)号：WO2008127268A3

公开(公告)日：2008-12-24

申请号：PCT/US2007017865

申请日：2007-08-13

Applicant: GCT SEMICONDUCTOR INC ,  PARK JOONBAE ,  LEE KYEONGHO ,  KOO YIDO ,  LEE JEONG WOO

Inventor： PARK JOONBAE ,  LEE KYEONGHO ,  KOO YIDO ,  LEE JEONG WOO

IPC: H04B1/38

CPC classification number: H04B1/1607

Abstract: Embodiments of an RFIC and methods for same and mobile terminals can internally reduce an input voltage to provide a prescribed voltage to a radio frequency transceiver. Embodiments of an RFIC can have a high efficiency and/or a low noise. In one embodiment, a device can include a PMIC and an RFIC. The RFIC can include an RF transceiver to carry out an RF transmission and an RF reception, a DC-DC converter to lower a voltage provided by the PMIC, and an LDO regulator to regulate the lowered voltage to a fixed voltage used by the RF transceiver.

Abstract translation: RFIC的实施例以及用于相同和移动终端的方法可以在内部减小输入电压以向射频收发器提供规定的电压。 RFIC的实施例可以具有高效率和/或低噪声。 在一个实施例中，设备可以包括PMIC和RFIC。 RFIC可以包括用于执行RF传输和RF接收的RF收发器，用于降低由PMIC提供的电压的DC-DC转换器以及用于将降低的电压调节到由RF收发器使用的固定电压的LDO调节器 。

公开(公告)号：WO2008005421A2

公开(公告)日：2008-01-10

申请号：PCT/US2007015333

申请日：2007-07-02

Applicant: GCT SEMICONDUCTOR INC ,  PARK JOONBAE ,  LEE KYEONGHO ,  JUNG SAN HUNG ,  LEE EAL WAN ,  SONG IN HO

Inventor： PARK JOONBAE ,  LEE KYEONGHO ,  JUNG SAN HUNG ,  LEE EAL WAN ,  SONG IN HO

IPC: H04J1/04

CPC classification number: H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0022

Abstract: The application discloses embodiments of methods and/or systems for compensating a transmission carrier leakage of an up-conversion mixer, a tranceiving circuit or apparatus embodying the same. One embodiment of a method can include detecting an I channel DC offset DCI 0 and a Q channel DC offset DCQ 0 generated by a reception carrier leakage from an output of a down-conversion mixer, detecting an I channel DC offset DCI and a Q channel DC offset DCQ from the output of the down conversion mixer while varying a compensation parameter being inputted to an up conversion mixer that has its output coupled to an input of the down-conversion mixer to determine the compensation parameter that can reduce or minimize a transmission carrier leakage. A combination of a transmission baseband signal and the determined compensation parameter can be transmitted using the up-conversion mixer and an antenna to compensate for the transmission carrier leakage.

Abstract translation: 本申请公开了用于补偿上变频混频器，引入电路或体现其的转换混频器的传输载波泄漏的方法和/或系统的实施例。 方法的一个实施例可以包括从下行链路的输出检测由接收载波泄漏产生的I信道DC偏移DCI 0和Q信道DC偏移DCQ <0> 转换混频器，从下变频混频器的输出检测I信道DC偏移DCI和Q信道DC偏移DCQ，同时改变输入到上变频混频器的补偿参数，该上变频混频器的输出耦合到下转换的输入 混频器确定可以减少或最小化传输载波泄漏的补偿参数。 传输基带信号和所确定的补偿参数的组合可以使用上变频混频器和天线来传输，以补偿传输载波泄漏。

公开(公告)号：CA2537261C

公开(公告)日：2014-07-08

申请号：CA2537261

申请日：2004-08-27

Applicant: GCT SEMICONDUCTOR INC

Inventor： JEON YOUNG-DEUK ,  LEE SEUNG-WOOK ,  LEE JEONG-WOO ,  PARK JOONBAE ,  LEE KYEONGHO

IPC: H04B1/38

Abstract: A system and method for filtering signals in a communications system reduces hardware and chip size requirements by selectively connecting a filter along transmitter and receiver paths of a transceiver. In operation, a controller generated signals for connecting the filter along the transmitter path when the transceiver is in transmitter mode and for connecting the filter along the receiver path when the transmitter is in receiver mode. The controller then generates additional signals for setting one or more parameters of the filter based on the path connected, or put differently based on the operational mode of the transceiver. In a variation, the controller sets the parameters of additional elements coupled to the filter as a way of further controlling processing of the transmitter and receiver signals.

公开(公告)号：CA2391480C

公开(公告)日：2009-10-06

申请号：CA2391480

申请日：2000-11-13

Applicant: GCT SEMICONDUCTOR INC

Inventor： LEE KYEONGHO ,  JEONG DEOG-KYOON ,  PARK JOONBAE ,  KIM WONCHAN

IPC: H04L27/00 ,  H02K7/10 ,  H02K13/02 ,  H02K21/22 ,  H03D3/18 ,  H03D3/24 ,  H03H11/22 ,  H03K5/08 ,  H03L7/089 ,  H03L7/099 ,  H03L7/197 ,  H04B1/06 ,  H04B1/28 ,  H04B1/38 ,  H04B1/40 ,  H04L27/04 ,  H04L27/06 ,  H04L27/08

Abstract: The RF communication system includes an antenna that receives/transmits RF signals, a PLL (730) that generates multi-phase clock signals having a frequency different from a carrier frequency and a reference signal having a carrier frequency, a demodulation-mixer (720) that mixes the received RF signals with the multi- phase clock signals having the frequency different from the carrier frequency to output signals having a frequency reduced relative to the carrier frequency, two stage amplification (740, 750) that amplifies a selected channel signal to a required dynamic level, a nd an A/D converting unit (770 A) for converting the RF signals from the mixing unit into digital signals. The two stage amplificati on can provide the selected channel signal with sufficient gain, even when an adjacent channel signal is output by the demodulation mix er (720) with greater amplitude or power.

公开(公告)号：DE60317669T2

公开(公告)日：2008-10-30

申请号：DE60317669

申请日：2003-06-05

Applicant: GCT SEMICONDUCTOR INC

Inventor： KOO YIDO ,  LEE JEONG-WOO ,  PARK JOONBAE ,  LEE KYEONGHO

IPC: H03B5/08 ,  H03L7/08 ,  H03B1/00 ,  H03B5/12 ,  H03L7/099

Abstract: A voltage-controlled oscillator including an active oscillator circuit, an inductor, and capacitive circuits is disclosed. The capacitive circuits are selectively turned on and off to control the frequency of the voltage-controlled oscillator. Particularly, the inductor and the capacitors in the capacitive circuits form LC circuits that provide feedback to the active oscillator circuit. To avoid damage to the switches in the capacitive circuits, the capacitive circuits further comprise resistors. The resistors can be configured in several different ways so that the voltage-controlled oscillator can have a high degree of reliability, and a wide tuning range with constant phase noise performance.

公开(公告)号：DE60317669D1

公开(公告)日：2008-01-03

申请号：DE60317669

申请日：2003-06-05

Applicant: GCT SEMICONDUCTOR INC

Inventor： KOO YIDO ,  LEE JEONG-WOO ,  PARK JOONBAE ,  LEE KYEONGHO

IPC: H03B5/08 ,  H03L7/08 ,  H03B1/00 ,  H03B5/12 ,  H03L7/099

Abstract: A voltage-controlled oscillator including an active oscillator circuit, an inductor, and capacitive circuits is disclosed. The capacitive circuits are selectively turned on and off to control the frequency of the voltage-controlled oscillator. Particularly, the inductor and the capacitors in the capacitive circuits form LC circuits that provide feedback to the active oscillator circuit. To avoid damage to the switches in the capacitive circuits, the capacitive circuits further comprise resistors. The resistors can be configured in several different ways so that the voltage-controlled oscillator can have a high degree of reliability, and a wide tuning range with constant phase noise performance.

公开(公告)号：HK1081738A1

公开(公告)日：2006-05-19

申请号：HK06101477

申请日：2006-02-03

Applicant: GCT SEMICONDUCTOR INC

Inventor： KOO YIDO ,  LEE JEONG-WOO ,  PARK JOONBAE ,  LEE KYEONGHO

IPC: H03B5/08 ,  H03L20090101 ,  H03B20090101 ,  H03B1/00 ,  H03B5/12 ,  H03L7/099

Abstract: A voltage-controlled oscillator including an active oscillator circuit, an inductor, and capacitive circuits is disclosed. The capacitive circuits are selectively turned on and off to control the frequency of the voltage-controlled oscillator. Particularly, the inductor and the capacitors in the capacitive circuits form LC circuits that provide feedback to the active oscillator circuit. To avoid damage to the switches in the capacitive circuits, the capacitive circuits further comprise resistors. The resistors can be configured in several different ways so that the voltage-controlled oscillator can have a high degree of reliability, and a wide tuning range with constant phase noise performance.