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    Phase lock loop gain control using unit current sources
    61.
    发明公开
    Phase lock loop gain control using unit current sources 有权
    Phasenregelschleifeverstärkungssteuerungmit Einheitsstromquellen

    公开(公告)号：EP1244215A1

    公开(公告)日：2002-09-25

    申请号：EP02252014.2

    申请日：2002-03-20

    Applicant: Broadcom Corporation

    Inventor： Gomez, Ramon A.

    IPC: H03L7/00

    CPC classification number: H03L7/00 ,  H03B5/1212 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/1253 ,  H03B5/1265 ,  H03B5/1278 ,  H03B2200/0046 ,  H03B2200/0048 ,  H03B2200/005 ,  H03B2201/02 ,  H03B2201/0208 ,  H03B2201/025 ,  H03D7/165 ,  H03D7/18 ,  H03J5/244 ,  H03J2200/10 ,  H03L7/0898 ,  H03L7/093 ,  H03L7/099 ,  H03L7/10 ,  H03L7/107 ,  H03L7/1072 ,  H03L7/18

    Abstract: A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO (222) includes a parallel LC circuit (228) having multiple fixed capacitors that can be switched-in or switched-out of the LC circuit according to a capacitor control signal to perform band-select tuning of the VCO. The gain compensator compensates for the variable VCO gain by generating a charge pump reference current that is based on the same capacitor control signal that controls the fixed capacitors in the LC circuit. The gain compensator generates the charge pump reference current by replicating a reference scale current using unit current sources. The number of times the reference scale current is replicated is based on the fixed capacitance that is switched-in to the LC circuit and therefore the frequency band of the PLL. The reference scale current is generated based on a PLL control that specifics certain PLL characteristics such as reference frequency, loop bandwidth, and loop damping. Therefore, the reference pump current can be efficiently optimized for changing PLL operating conditions, in addition to compensating for variable VCO gain.

    Abstract translation: 增益补偿器补偿锁相环（PLL）中变容二极管调谐电压调谐振荡器（VCO）的增益变化。 VCO（222）包括具有多个固定电容器的并联LC电路（228），该固定电容器可以根据电容器控制信号切换或切换出LC电路，以执行VCO的频带选择调谐。 增益补偿器通过产生基于控制LC电路中的固定电容器的相同电容器控制信号的电荷泵参考电流来补偿可变VCO增益。 增益补偿器通过使用单位电流源复制参考刻度电流来产生电荷泵参考电流。 参考比例电流复制的次数是基于切换到LC电路的固定电容，因此是PLL的频带。 参考比例电流是基于特定某些PLL特性（如参考频率，环路带宽和环路阻尼）的PLL控制产生的。 因此，除了补偿可变VCO增益之外，参考泵电流可以有效地优化用于改变PLL工作条件。

    PORTABLE RADIO COMPRISING A CONNECTABLE CIRCUIT
    63.
    发明公开
    PORTABLE RADIO COMPRISING A CONNECTABLE CIRCUIT 失效
    与电路连接的便携式FUNFGERÄT

    公开(公告)号：EP0829143A1

    公开(公告)日：1998-03-18

    申请号：EP97908424.0

    申请日：1997-03-28

    Applicant: Philips Electronics N.V.

    Inventor： ROUSSELIN, Samuel

    IPC: H03B5 ,  H03L7 ,  H03B1

    CPC classification number: H03B5/04 ,  H03B2201/025 ,  H03J2200/10 ,  H03L7/099 ,  H03L7/10 ,  H03L7/183

    Abstract: The electronic device comprises an oscillation circuit (1, 2, 3, 10, 11, C1, C2, C3) included in a phase-locked loop which comprises a phase detector (17) and a variable divider (15) depending on a certain quantity. A check circuit is provided which either or not melts a fuse (25) as a function of the magnitude of the output of said phase detector (17) for each quantity of said divider indicating a bad or good locking respectively, of said loop. Application: Determination of wideband radio receiver/transmitter.

    A tuning circuit for a radio receiver
    64.
    发明公开
    A tuning circuit for a radio receiver 失效
    AbstimmschaltungfürRadioempfänger

    公开(公告)号：EP0789455A1

    公开(公告)日：1997-08-13

    申请号：EP96309350.5

    申请日：1996-12-20

    Applicant: Ford Motor Company

    Inventor： Roberts, Howard Graeme ,  Kuo, Yao Hsien ,  Tillo II, Edmund Joe ,  Kennedy, John Francis

    IPC: H03J5/24

    CPC classification number: H03J5/244 ,  H03B2201/025

    Abstract: An improved tuner for a varactor-tuned local oscillator (54) in a radio receiver includes a winding of a pair of magnetically coupled coils (32), preferably constructed in the form of a transformer. Preferably, the first and second windings (30,34) of the transformer are magnetically coupled with reduced inter-winding capacitance by axially separating the windings on a common core. The second winding (34) is selectively coupled by a switch (48) to a capacitive load (40) in order to change the inductance of the first winding. The tuning range of the resonant circuit formed by the varactor diode set (26,28) and the first winding (30) is changed when the capacitive load (40) is coupled. The magnetic coupling between the transformer windings provides DC isolation between the oscillator and the switching circuit. Preferably, a tuning actuator has overlapping ranges of movement for selection of a signal within both the AM and FM frequency bands as the intermediate frequencies for the local oscillator are generated.

    Abstract translation: 用于无线电接收机中的变容二极管调谐本地振荡器（54）的改进的调谐器包括一对磁耦合线圈（32）的绕组，优选地以变压器的形式构造。 优选地，变压器的第一和第二绕组（30,34）通过在公共芯上轴向分离绕组而磁耦合减小的绕组间电容。 为了改变第一绕组的电感，第二绕组（34）被开关（48）有选择地耦合到电容性负载（40）。 当电容性负载（40）耦合时，由变容二极管组（26,28）和第一绕组（30）形成的谐振电路的调谐范围被改变。 变压器绕组之间的磁耦合在振荡器和开关电路之间提供直流隔离。 优选地，当生成本地振荡器的中间频率时，调谐致动器具有重叠的移动范围，用于选择AM和FM频带内的信号。

    LC OSCILLATOR WITH WIDE TUNING RANGE AND LOW PHASE NOISE
    67.
    发明授权
    LC OSCILLATOR WITH WIDE TUNING RANGE AND LOW PHASE NOISE 有权
    与大的调谐和低相位噪声LC振荡器

    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

    Applicant: GCT Semiconductor, Inc.

    Inventor： KOO, Yido ,  LEE, Jeong-Woo ,  PARK, Joonbae ,  LEE, Kyeongho

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

    CPC classification number: H03L7/099 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1265 ,  H03B2201/025 ,  H03J2200/10

    Abstract: 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.

    SYSTEM FOR CONTROLLING THE FREQUENCY OF AN OSCILLATOR
    69.
    发明公开
    SYSTEM FOR CONTROLLING THE FREQUENCY OF AN OSCILLATOR 有权
    系统ZUR STEUERUNG DER FREQUENZ EINES OSZILLATORS

    公开(公告)号：EP1374387A4

    公开(公告)日：2004-05-26

    申请号：EP02721582

    申请日：2002-03-25

    Applicant: SKYWORKS SOLUTIONS INC

    Inventor： DAMGAARD MORTEN ,  DOMINO WILLIAM J ,  MAGOON RAHUL ,  MOLNAR ALYOSHA C ,  ZACHAN JEFF

    IPC: H03B1/00 ,  H03L5/00 ,  H03L7/087 ,  H03L7/099 ,  H03L7/113 ,  H03L7/187 ,  H04B1/40

    CPC classification number: H03L7/099 ,  H03B2201/025 ,  H03B2201/0291 ,  H03J2200/10 ,  H03L5/00 ,  H03L7/087 ,  H03L7/113

    Abstract: Systems for controlling the frequency of the output signal of a controllable oscillator (202) in a frequency synthesizer (200) are provided. One such system comprises a controllable oscillator (202) and a frequency control circuit (208). The controllable oscillator (202) is configured to generate an output signal that has a predefined frequency. The controllable oscillator (202) is also configured with a plurality of operational states that are controlled by the frequency control circuit (208). Each operational state of the controllable oscillator (202) defines a distinct frequency for the output signal of the controllable oscillator (202). The frequency control circuit (208) receives the output signal of the controllable oscillator (202) and determines the distinct frequency for the output signal that best approximates the predefined frequency. The frequency control circuit (208) may also provide a control signal to the controllable oscillator (202) that is configured to change the controllable oscillator (202) to the operational state corresponding to the distinct frequency that best approximates the predefined frequency.

    Abstract translation: 提供了用于控制频率合成器中可控振荡器的输出信号的频率的系统。 一个这样的系统包括可控振荡器和频率控制电路。 可控振荡器被配置为产生具有预定频率的输出信号。 可控振荡器还配置有由频率控制电路控制的多个操作状态。 可控振荡器的每个操作状态为可控振荡器的输出信号定义了不同的频率。 频率控制电路接收可控振荡器的输出信号，并确定最接近预定频率的输出信号的不同频率。 频率控制电路还可以向可控振荡器提供控制信号，该控制信号被配置为将可控振荡器改变为对应于最接近于预定频率的不同频率的操作状态。

    ADJUSTABLE FREQUENCY STABILIZING INTERNAL CHIP CAPACITOR SYSTEM
    70.
    发明授权
    ADJUSTABLE FREQUENCY STABILIZING INTERNAL CHIP CAPACITOR SYSTEM 有权
    可调，稳频，片内电容器装置

    公开(公告)号：EP0985266B1

    公开(公告)日：2001-12-19

    申请号：EP99912935.6

    申请日：1999-03-24

    Applicant: MICROCHIP TECHNOLOGY INC.

    Inventor： BRUWER, Frederick ,  SMIT, Willem

    IPC: H03B5/20

    CPC classification number: H03B5/20 ,  H03B2201/02 ,  H03B2201/025 ,  H03B2201/0266 ,  H03J2200/10 ,  Y10T307/826

    Abstract: A transmitter system comprises an oscillator and having an adjustable monolithic capacitor circuit used for frequency stabilization. The oscillator signal is modulated and transmitted. A data generating chip is coupled to the transmitter. The data generating chip is used for adjusting and controlling the transmitter oscillator frequency signal. The adjustable capacitor circuit is located internal to the data generating chip and is coupled to a ground pin and one of a plurality of function pins on the data generating chip. The adjustable capacitor circuit is used for adjusting and setting the centerpoint of the transmitter oscillator frequency signal.

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