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1. 发明公开

EP1735907A4 HIGHLY LINEAR VARIABLE GAIN AMPLIFIER 审中-公开
标题翻译：高的线性可变增益放大器
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.

2. 发明专利

CA2555468C IMPROVEMENT OF THE COARSE TUNING TIME IN PLL WITH LC OSCILLATOR 未知
公开(公告)号：CA2555468C
公开(公告)日：2016-05-03
申请号：CA2555468
申请日：2005-01-13
申请人： GCT SEMICONDUCTOR INC
发明人： LEE KANG YOON , KOO YIDO , LEE JEONG-WOO , PARK JOONBAE , LEE KYEONGHO
IPC分类号： H03B5/00 , H03L7/085 , H03L7/099 , H03L7/197 , H03L7/199
摘要： Tuning methods and apparatuses for LC oscillators are disclosed. Embodiments of the present invention include an adaptively controlling the bit~comparison 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.

3. 发明专利

CA2582345C SIGMA-DELTA BASED PHASE LOCK LOOP 未知
公开(公告)号：CA2582345C
公开(公告)日：2013-11-05
申请号：CA2582345
申请日：2005-09-21
申请人： GCT SEMICONDUCTOR INC
发明人： KOO YIDO , AHN YOUNGHO , SONG EUNSEOK , LEE JEONG-WOO , PARK JOONBAE , LEE KYEONGHO
IPC分类号： H03D3/24
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.

4. 发明专利

DE60234580D1 未知
公开(公告)号：DE60234580D1
公开(公告)日：2010-01-14
申请号：DE60234580
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： H03G3/20 , H04B7/00 , H03G3/30 , H04B1/30
摘要： A wireless or wired communication system and method is provided including a transmitter and a receiver. A RF communication system in accordance with the present invention includes an apparatus and gain control method between RF receiver and baseband modem in case of a plurality of gain stages inside a receiver. The gain of each stage can be controlled by an integrated gain controller. The gain controller monitors the signal level of each gain stage to place its gain to optimal value. The gain control apparatus and method can be implemented in a digital AGC system. The gain controller accepts a signal implementing gain control and thus there is no stability issue. When distributed gain stages are present inside a related art receiver and separate gain control loops are used, stability issues can arise. In a preferred embodiment of an apparatus and method, the baseband modem decides the amount of gain control and adjusts the gain of certain gain stages by the proper amount.

5. 发明专利

HK1082351A1 COMMUNICATION TRANSMITTER USING OFFSET PHASE-LOCKED-LOOP 未知
公开(公告)号：HK1082351A1
公开(公告)日：2006-06-02
申请号：HK06104363
申请日：2006-04-11
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： H03C3/09 , H04L20100101
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.

6. 发明专利

AU2003284892A1 RADIO RECEIVER AND METHOD FOR AM SUPPRESSION AND DC-OFFSET REMOVAL 未知
公开(公告)号：AU2003284892A1
公开(公告)日：2004-05-25
申请号：AU2003284892
申请日：2003-10-23
申请人： GCT SEMICONDUCTOR INC
发明人： PARK JOONBAE , LEE KYEONGHO , SONG EUNSEOK , JUNG YEONJAE
IPC分类号： H04B1/10
摘要： A communications receiver includes a baseband signal recovery circuit which uses a low-IF architecture for data reception. The baseband signal recovery circuit uses a full-analog implementation for channel selection and filtering. 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.

7. 发明专利

AU764882B2 Single chip cmos transmitter/receiver and VCO-mixer structure 未知
公开(公告)号：AU764882B2
公开(公告)日：2003-09-04
申请号：AU5084099
申请日：1999-07-23
申请人： GCT SEMICONDUCTOR INC
发明人： LEE KYEONGHO , JEONG DEOG-KYOON
IPC分类号： H03D1/22 , H03D7/00 , H03H11/22 , H03K9/00 , H03L7/089 , H03L7/099 , H03L7/197 , H04B1/26 , H04B1/40 , H04L7/00 , H04L27/18 , H04L27/34 , H04B1/00 , H04B1/50 , H04L27/00
摘要： A single chip RF communication system and method and a VCO-mixer (130) structure are provided. The RF communication system in accordance with the present invention includes a transmitter (1100) and a receiver (100), an antenna for receiving transmitting RF signals, a PLL (130) for generating multi-phase clock signals having a frequency different from a carrier frequency in response to the multi-phase clock signals and a reference signal having the carrier frequency, a demodulation-mixing unit (140) for mixing the received signal with the multi-phase clock signals having a frequency different from the carrier frequency to output the RF signals having a frequency reduced by the carrier frequency and an A/D converting unit (160) for converting the RF signals from the mixing unit into digital signals. The VCO (130) in accordance with the present invention includes a plurality of differential delay and the mixer includes a differential amplifying circuit (1200A) and combining circuit (1200B). The differential amplifying circuit (1200A) of the multi-phase mixer includes two load resistors (R2, R1) coupled to two differential amplifiers (1200A1, 1200A2) respectively. The combining circuit (1200B) includes bias transistors (1232, 1234), first and second combining circuits coupled to the bias transistors, respectively and a current source coupled to the first and second combining units.

8. 发明专利

CA2442515A1 AUTOMATIC GAIN CONTROL METHOD FOR HIGHLY INTEGRATED COMMUNICATION RECEIVER 未知
公开(公告)号：CA2442515A1
公开(公告)日：2002-10-10
申请号：CA2442515
申请日：2002-03-27
申请人： GCT SEMICONDUCTOR INC
发明人： LEE JEONG-WOO , PARK JOONBAE , KANG SUWON , LEE KYEONGHO
IPC分类号： H03G3/20 , H03G3/30 , H04B1/30 , H04B7/00 , H03G9/00
摘要： A wireless or wired communication system and method is provided including a transmitter and a receiver. A RF communication system in accordance with the present invention includes an apparatus and gain control method between RF receiver (803) and baseband modem (804) in case of a plurality of gain stages (830, 846, 862) inside a receiver (803). The gain of each stage (830, 846, 862) can be controlled by an integrated gain controller (828). The gain controller (828) monitors the signal level of each gain stage (830, 846, 862) to place its gain to optimal value. The gain control apparatus and method can be implemented in a digital AGC system. The gain controller (828) accepts a signal (826) implementing gain control and thus there is no stability issue. When distributed gain stages are present inside a related art receiver and separate gain control loops are used, stability issues can arise.

9. 发明专利

CA2442332A1 VARIABLE GAIN LOW-NOISE AMPLIFIER FOR A WIRELESS TERMINAL 未知
公开(公告)号：CA2442332A1
公开(公告)日：2002-10-10
申请号：CA2442332
申请日：2002-03-28
申请人： GCT SEMICONDUCTOR INC
发明人： JEONG HOE-SAM , LEE WON-SEOK , LEE SEUNG-WOOK , PARK JOONBAE , LEE KYEONGHO
IPC分类号： H03F3/16 , H03G1/00 , H03G3/10 , H03G3/18
摘要： A variable gain, low noise amplifier is described, which is suitable as the input amplifier for a wireless terminal, or as the pre-amplifier stage of a wireless terminal transmitter. The amplifier (MN1) may achieve variable gain by deploying a network of transistors (MP1-MPn) in a parallel array, each independently selectable by a PMOS switch (220), and providing the variable resistance for the resonant circuit (Rp, Lp). Power dissipation can also be mitigated by using a network of driving transistors, each independently selectable by a PMOS switch (220). The resonant frequency of the amplifier may be made tunable by providing a selection of optional pull-up capacitors (Cp'1- Cp'n).

10. 发明专利

CA2458877C AN ADAPTIVE LINEARIZATION TECHNIQUE FOR COMMUNICATION BUILDING BLOCK 未知
公开(公告)号：CA2458877C
公开(公告)日：2011-01-25
申请号：CA2458877
申请日：2002-08-29
申请人： GCT SEMICONDUCTOR INC
发明人： JEONG HEI-SAM , PARK JOONBAE , LEE KYEONGHO
IPC分类号： H03F1/26 , H03F1/32
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.

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