公开(公告)号：EP1371167B1

公开(公告)日：2008-03-05

申请号：EP02723501.9

申请日：2002-03-20

申请人： GCT Semiconductor, Inc.

发明人： HUH, Hyungki ,  SONG, Eunseok ,  LEE, Kang Yoon ,  KOO, Yido ,  LEE, Jeongwoo ,  PARK, Joonbae ,  LEE, Kyeongho

IPC分类号： H04L7/00 ,  H03L7/087 ,  H03L7/197 ,  H03L7/089 ,  H03L7/091 ,  H03L7/095

CPC分类号： H03L7/1976 ,  H03L7/087 ,  H03L7/0898 ,  H03L7/095

摘要： A phase-locked loop (PLL) frequency synthesizer (Fig. 3) incorporates fractional spur compensation circuitry. This fractional spur compensation circuitry dynamically compensates charge pump ripple whenever a charge pump operates. It can utilize a programmable divider (336), two phase detectors (314 and 324) each using a charge pump stage pumps. A fractional accumulator stage (340) determines the number of charge pumps that operate during a phase comparison. The PLL frequency synthesizer avoids the need for compensation current trimming. Also, fractional compensation is accomplished dynamically and in a manner that is robust to environmental changes. A phase-locked loop (PLL) fractional-N type frequency synthesizer can incorporate a sample-and-hold circuit. The synthesizer can reduce circuit size by eliminating a loop filter. The synthesizer or fractional-N type PLL can use a divider and at least two phase detectors coupled to a sample-and-hold circuit. A lock detecting circuit can initially determine a reference voltage for the sample-and-hold circuit.

公开(公告)号：EP1514351B1

公开(公告)日：2007-11-21

申请号：EP03728954.3

申请日：2003-06-05

申请人： GCT Semiconductor, Inc.

发明人： KOO, Yido ,  LEE, Jeong-Woo ,  PARK, Joonbae ,  LEE, Kyeongho

IPC分类号： H03L7/08 ,  H03B5/08 ,  H03L7/099

CPC分类号： H03L7/099 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1265 ,  H03B2201/025 ,  H03J2200/10

摘要： A voltage-controlled oscillator (600) including an active oscillator circuit (610), 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 (600). Particularly, the inductor and the capacitors in the capacitive circuits form LC circuits that provide feedback to the active oscillator circuit (610). To avoid damage to the switches in the capacitive circuits, the capacitive circuits further comprise resistors (622). The resistors can be configured in several different ways so that the voltage-controlled oscillator (600) can have a high degree of reliability, and a wide tuning range with constant phase noise performance.

公开(公告)号：EP1735907A4

公开(公告)日：2007-07-18

申请号：EP05725392

申请日：2005-03-10

申请人： GCT SEMICONDUCTOR INC

发明人： PARK JOONBAE ,  LEE SEUNG-WOOK ,  LEE JEONG-WOO ,  LEE KYEONGHO

IPC分类号： H03F3/45 ,  H03F3/21

CPC分类号： H03F3/211 ,  H03F3/45475 ,  H03F3/45659 ,  H03F2203/45136 ,  H03F2203/45138 ,  H03F2203/45166 ,  H03F2203/45168 ,  H03F2203/45434 ,  H03F2203/45522 ,  H03F2203/45591

摘要： A variable-gain amplifier circuit uses a pair of single-ended operational amplifiers (100, 110) to amplify complementary portions of a differential input signal (IN, INB). By using two single-ended amplifiers (100, 110) 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：EP1527522A1

公开(公告)日：2005-05-04

申请号：EP03771871.5

申请日：2003-07-28

申请人： GCT Semiconductor, Inc.

发明人： SONG, Eunseok ,  LEE, Seung-Wook ,  LEE, Jeong-Woo ,  PARK, Joonbae ,  LEE, Kyeongho

IPC分类号： H04B1/00 ,  H04B1/26

CPC分类号： H04B1/28 ,  H04B1/525

摘要： A method and apparatus that provide a frequency conversion in a radio frequency front-end are disclosed, including a frequency divider (407) that divides an input signal frequency by a predetermined value to produce an output signal frequency (417); and a frequency mixer (405, 406) that mixes the output signal frequency (417) with a carrier signal frequency to produce a converted signal frequency, which is substantially equal to a difference between the output signal frequency (417) and the carrier signal frequency. The predetermined value and the input signal frequency are selected such that the carrier signal frequency is not substantially equivalent to an integer multiple of the output signal frequency (417). The method and apparatus can be used in a wireless communication receiver including wireless communication systems and wireless LAN systems.

公开(公告)号：EP1374439B1

公开(公告)日：2009-12-02

申请号：EP02757777.4

申请日：2002-03-27

申请人： GCT Semiconductor, Inc.

发明人： KANG, Suwon ,  LEE, Jeong-Woo ,  PARK, Joonbae ,  LEE, Kyeongho

IPC分类号： H03G3/30

CPC分类号： H03G3/3068

公开(公告)号：EP1803216A2

公开(公告)日：2007-07-04

申请号：EP05802909.1

申请日：2005-09-21

申请人： GCT Semiconductor, Inc.

发明人： KOO, Yido ,  AHN, Youngho, 418-102 Samsung Raemiahn 4 Apt. ,  SONG, Eunseok ,  LEE, Jeong-Woo, 101-204 Samhwan Apt. ,  PARK, Joonbae ,  LEE, Kyeongho, 401 Shindongkwang Villa 108-8

IPC分类号： H03D3/24

CPC分类号： H03L7/0895 ,  H03L7/1976

摘要： A sigma-delta based phase lock loop device is provided that includes a phase frequency detector (PFD), a charge pump and a voltage controlled oscillator. The PDF to receive a reference signal and a feedback signal and to output signals based on a comparison of the reference signal and the feedback signal. The charge pump to output a charge based on the output signals from the PFD. The charge pump including a first current source to apply a fixed amount of current and a second current source to apply a variable amount of current. The voltage controlled oscillator to output a clock signal based on the received charge from the charge pump.

公开(公告)号：EP1803186A2

公开(公告)日：2007-07-04

申请号：EP05800772.5

申请日：2005-09-21

申请人： GCT Semiconductor, Inc.

发明人： Park, Joonbae ,  Lee, Seung-Wook ,  Lee, Jeong-Woo ,  Lee, Kyeongho

IPC分类号： H01P5/12

CPC分类号： H03L7/113 ,  H03L7/087 ,  H03L7/10 ,  H03L7/187

摘要： An apparatus for oscillating a frequency, which comprises a phase lock loop, see fig. 5, a variable frequency divider() is shown, that divides a first frequency (Fout) signal by a division ratio to generate a second frequency signal, this based on a comparison of reference frequency clock input (Fref) and feedback input to phase/frequency detector (510). A charge pump (520) and loop filter (530) are shown with a divider (550) that divides the second frequency signal (355) to allow the correct feedback frequency to be realized. The VCO (540) inherently has a resonant circuit including the capacitors to be selected and a corresponding control voltage to set the frequency of operation as well as an active circuit (320) for proper gain.

公开(公告)号：EP1557021A1

公开(公告)日：2005-07-27

申请号：EP03783099.9

申请日：2003-10-31

申请人： GCT Semiconductor, Inc.

发明人： LEE, Kang-Yoon ,  SONG, Eunseok ,  LEE, Jeong-Woo ,  PARK, Joonbae ,  LEE, Kyeongho

IPC分类号： H04L27/20 ,  H04L27/04 ,  H04L27/12

CPC分类号： H03C3/0966 ,  H03C3/0933

摘要： A translational-loop transmitter generates RF signals using at most one phase-locked-loop (PLL) circuit. In one embodiment, a single PLL generates two local oscillation signals. The first oscillation signal is mixed with a baseband signal to generate an intermediate frequency signal. The second oscillation signal is input into the translational loop to adjust a voltage-controlled oscillator to the desired carrier frequency. In order to perform this type of modulation, the frequencies of the local oscillation signals are set so that they are harmonically related to one another relative to the carrier frequency. Other embodiments generate only one oscillation signal. Under these conditions, the intermediate frequency signal is generated using the oscillation signal, and a frequency divider in the translational loop is used to generate a control signal for adjusting the voltage-controlled oscillator to the carrier frequency. In still other embodiments, a transmitter signal is generated without using any phase-locked-loop circuits. This is accomplished by generating an intermediate frequency signal using a crystal oscillator, and then using a frequency divider in a feedback loop to generate a control signal for adjusting the voltage-controlled oscillator to the carrier frequency. By minimizing the number of phase-locked-loop circuits in the transmitter, the size, cost, and power requirements of mobile handsets may be significantly reduced.

公开(公告)号：EP1557019A2

公开(公告)日：2005-07-27

申请号：EP03779213.2

申请日：2003-10-23

申请人： GCT Semiconductor, Inc.

发明人： PARK, Joonbae,Sampoong Apt 8-303 ,  LEE, Kyeongho,Samsung-San Jookong Apt 309-901 ,  SONG, Eunseok,Imkwang APT 15-405 ,  JUNG, Yeonjae

IPC分类号： H04L25/10

CPC分类号： H04B1/109

摘要： A communications receiver includes a baseband signal recovery circuit (4) which uses a low-IF architecture for data reception. The baseband signal recovery circuit uses a full-analog implementation for channel selection and filtering (5). Thus, the overhead placed on the design of analog-to-digital converter is greatly relaxed and most of hardware can be re-used for multi-mode applications with only a slight modification.

公开(公告)号：EP1433250A1

公开(公告)日：2004-06-30

申请号：EP02759481.1

申请日：2002-08-29

申请人： GCT Semiconductor, Inc.

发明人： JEONG, Hei-Sam,198-13, Jina High Vil Apt ,  PARK, Joonbae ,  LEE, Kyeongho,Samsung-san-Jookong Apt.

IPC分类号： H03F1/26

CPC分类号： H03F1/3223 ,  H03F1/3229

摘要： The present invention is directed to a linearization apparatus and method. Preferred embodiments according to the present invention can combine an auxiliary non-linear block (300) to a functional block of a system to increase linearity of an output signal (520) of the system such as a communication system. System overhead due to the non-linear auxiliary block can be small because of circuit structure, cost and low consumption. Further, the non-linear auxiliary block can be designed so that no feedback path is required. Further preferred embodiments can use a feedback path without loss of stability by using a cancellation apparatus or process based on an averaging detection of the output signal. For example, a feedback loop can detect power leakage in a sideband caused by non-linearities of the communication system.

摘要翻译： 本发明涉及一种线性化装置和方法。 根据本发明的优选实施例可以将辅助非线性块（300）组合到系统的功能块，以增加系统（例如通信系统）的输出信号（520）的线性度。 由于电路结构，成本和低消耗，由于非线性辅助块引起的系统开销可能很小。 此外，非线性辅助块可以设计成不需要反馈路径。 进一步优选的实施例可以通过使用消除设备或基于输出信号的平均检测的处理来使用反馈路径而不会失去稳定性。 例如，反馈回路可以检测由通信系统的非线性引起的边带中的功率泄漏。