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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. 发明公开

EP1514351A4 LC OSCILLATOR WITH WIDE TUNING RANGE AND LOW PHASE NOISE 有权
标题翻译： LC-OSZILLATOR MIT GROSSEM ABSTIMMBEREICH UND GERINGEM PHASENRAUSCHEN
公开(公告)号：EP1514351A4
公开(公告)日：2005-12-07
申请号：EP03728954
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： H03B5/08 , H03B1/00 , H03B5/12 , H03L7/099 , H03L7/08
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.
摘要翻译：公开了一种包括有源振荡器电路，电感器和电容电路的压控振荡器。电容电路选择性地导通和截止以控制压控振荡器的频率。特别地，电容电路中的电感器和电容器形成LC电路，从而向有源振荡器电路提供反馈。为了避免损坏电容电路中的开关，电容电路还包括电阻器。电阻器可以以多种不同的方式进行配置，使得压控振荡器具有高可靠性，以及具有恒定相位噪声性能的宽调谐范围。

3. 发明公开

EP1803216A4 SIGMA-DELTA BASED PHASE LOCK LOOP 审中-公开
标题翻译：相回路ONΣ-ΔBASE
公开(公告)号：EP1803216A4
公开(公告)日：2008-12-10
申请号：EP05802909
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
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.

4. 发明公开

EP1803186A4 APPARATUS AND METHOD OF OSCILLATING WIDEBAND FREQUENCY 审中-公开
标题翻译： DEVICE AND METHOD FOR宽带频率振荡
公开(公告)号：EP1803186A4
公开(公告)日：2008-09-24
申请号：EP05800772
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 , H03L7/087 , H03L7/187
CPC分类号： H03L7/113 , H03L7/087 , H03L7/10 , H03L7/187
摘要： An apparatus and method of oscillating a wideband frequency are disclosed. The apparatus includes: a frequency oscillating unit for oscillating a predetermined frequency; a phase-locked loop for comparing the oscillated frequency and a reference frequency by feedbacking the oscillated frequency from the frequency oscillating unit and fixing an oscillating frequency of the frequency oscillating unit; and a variable dividing unit for varying a division ratio to approach to a frequency band required by the oscillating frequency and dividing the oscillating frequency.

5. 发明公开

EP1556952A4 SYSTEM AND METHOD FOR SUPPRESSING NOISE IN A PHASE-LOCKED LOOP CIRCUIT 审中-公开
标题翻译： SYSTEM UND VERFAHREN ZURRAUSCHUNTERDRÜCKUNGIN EINEM PHASENREGELKREIS
公开(公告)号：EP1556952A4
公开(公告)日：2005-12-21
申请号：EP03779214
申请日：2003-10-23
申请人： GCT SEMICONDUCTOR INC
发明人： AHN YOUNGHO , SONG EUNSEOK , KOO YIDO , LEE JEONG-WOO , PARK JOONBAE , LEE KYEONGHO
IPC分类号： H03L7/197 , H03L7/06
CPC分类号： H03L7/1978
摘要： 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 may be 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.
摘要翻译：用于改善频率发生器的信噪比的系统和方法抑制了由于内部发生器电路中的失配而产生的相位噪声和噪声。这是利用调制方案实现的，该调制方案将发生器的环路带宽之外的寄生噪声信号移位。当以这种方式移动时，噪声信号可以使用例如沿着发生器的信号路径定位的滤波器被完全移除或以任何期望的程度移除。在一个实施例中，Σ-Δ调制器控制沿着锁相环路的反馈路径设置的脉冲吞咽分频器的值，以实现期望的噪声抑制水平。在另一个实施例中，输入到锁相环中的参考信号被调制以实现噪声抑制。在另一个实施例中，上述形式的调制被组合以实现期望的频移。通过这些调制技术，频率发生器的信噪比可以显着提高，同时实现更快的锁定时间。

6. 发明公开

EP1665557A4 SYSTEM AND METHOD FOR FILTERING SIGNALS IN A TRANSCEIVER 有权
标题翻译： EINEM SENDER /EMPFÄNGER中的VERFAHREN ZUM FILTERN VON SIGNALEN的系统
公开(公告)号：EP1665557A4
公开(公告)日：2013-06-05
申请号：EP04782302
申请日：2004-08-27
申请人： GCT SEMICONDUCTOR INC
发明人： JEON YOUNG-DEUK , LEE SEUNG-WOOK , LEE JEONG-WOO , PARK JOONBAE , LEE KYEONGHO
IPC分类号： H04B1/38 , H01P1/213 , H03H11/12 , H03J1/00 , H04B1/10 , H04B1/44 , H04B1/48 , H04B1/52
CPC分类号： H04B1/1027 , H03H11/1252 , H03H11/1291 , H03J1/0008 , H04B1/44
摘要： 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. The system and method are particularly well suited to controlling the filtering of signals at the front-end of the transceiver having a direct-conversion architecture and in general ones performing time-multiplexing applications.
摘要翻译：用于对通信系统中的信号进行滤波的系统和方法通过沿收发器的发射机和接收机路径选择性地连接滤波器来降低硬件和芯片尺寸的要求。在操作中，当收发器处于发射机模式时，控制器产生用于沿着发射机路径连接滤波器的信号，并且当发射机处于接收机模式时，控制器沿接收机路径连接滤波器。然后，控制器产生附加信号，用于基于连接的路径设置滤波器的一个或多个参数，或者基于收发器的操作模式进行不同的设置。在一个变型中，控制器设置耦合到滤波器的附加元件的参数作为进一步控制发射机和接收机信号的处理的一种方式。该系统和方法特别适用于控制在具有直接转换架构的收发器的前端处的信号的滤波，并且通常执行时间复用应用。

7. 发明公开

EP1716634A4 IMPROVEMENT OF THE COARSE TUNING TIME IN PLL WITH LC OSCILLATOR 有权转让
标题翻译：改善GROBABSTIMMZEIT在PLL与LC振荡器
公开(公告)号：EP1716634A4
公开(公告)日：2013-04-10
申请号：EP05764681
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： H03L7/085 , H03B5/00 , H03L7/099 , H03L7/197 , H03L7/199
CPC分类号： H03L7/085 , H03L7/099 , H03L7/1976 , H03L7/199
摘要： An LC-VCO includes a multivibrator which outputs a frequency signal, a fine tuning circuit which tunes the frequency signal by a first amount, a coarse tuning circuit which tunes the frequency signal by a second amount, and a control circuit which controls the fine and coarse tuning circuits. The coarse tuning circuit is formed from one or more capacitive arrays and the fine tuning circuit is formed from one or more varactors. The capacitive arrays are preferably controlled by a digital signal, where each bit selectively couples a respective capacitor to the multivibrator. An analog signal controls the value of the varactors. The capacitive arrays and varactors charge and discharge an inducator in the multivibrator to tune the frequency signal. The VCO may be incorporated within a phase-locked loop, where the capacitors may be assigned different weight and/or redundancy values to tune an output frequency signal. In one embodiment, coarse tuning and lead-lag detection is performed more accurately to allow the size of the varactors to become significantly reduced compared with other circuits which have been proposed.

8. 发明公开

EP1374439A4 AUTOMATIC GAIN CONTROL METHOD FOR HIGHLY INTEGRATED COMMUNICATION RECEIVER 有权
标题翻译：自动增益控制方法对于高集成通信接收机
公开(公告)号：EP1374439A4
公开(公告)日：2007-04-18
申请号：EP02757777
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 , H03G3/30 , H04B1/30
CPC分类号： H03G3/3068
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.

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