公开(公告)号：US20100039194A1

公开(公告)日：2010-02-18

申请号：US12241103

申请日：2008-09-30

Applicant: Hooman Darabi ,  Yuyu Chang ,  Zhimin Zhou ,  Morteza Vadipour

Inventor： Hooman Darabi ,  Yuyu Chang ,  Zhimin Zhou ,  Morteza Vadipour

IPC: H03J3/20

CPC classification number: H03L1/00 ,  H03B5/364 ,  H03B2201/0291 ,  H03J2200/10

Abstract: A frequency tuning device for use in a crystal oscillator circuit includes a first fine tuning array of capacitors, a second fine tuning array of capacitors and a coarse tuning array of capacitors coupled in parallel to produce a tuning capacitance for tuning the crystal oscillator. The first fine tuning array of capacitors includes a binary weighted switched capacitor network, the second fine tuning array of capacitors includes a thermometer coded switched capacitor network and the coarse tuning array of capacitors includes a binary weighted switched capacitor network with a different unit capacitance value than the first and second fine tuning arrays.

公开(公告)号：US20020040991A1

公开(公告)日：2002-04-11

申请号：US09866334

申请日：2001-05-25

Inventor： Sherif Embabi ,  Abdellatif Bellaouar

IPC: H01L029/76 ,  H01L027/108 ,  H01L029/94 ,  H01L031/036

CPC classification number: H01G2/00 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/1256 ,  H03B5/1265 ,  H03B2201/0266 ,  H03B2201/0291 ,  H03J2200/10

Abstract: A switched variable capacitor (20), and binary-weighted array (40) of such capacitors (20), are disclosed. The switched variable capacitor (20) includes a switching transistor (14) connected in series with first and second capacitors (12), between the two terminals (A,B). Bias transistors (18) are provided, and of opposite conductivity type as the switching transistor (14) but with their gates connected to the gate of the switching transistor (14). The bias transistors (18), when on, apply a reverse bias voltage to the source/drain regions of the switching transistor (14), to minimize the parasitic junction capacitance, and thus improve the temperature stability of the capacitor (20). A binary-weighted array (40) of switched variable capacitors (20) is also disclosed, as is a voltage-controlled oscillator (50) incorporating such an array (40).

Abstract translation: 公开了一种开关式可变电容器（20）和这种电容器（20）的二进制加权阵列（40）。 开关可变电容器（20）包括在两个端子（A，B）之间与第一和第二电容器（12）串联连接的开关晶体管（14）。 提供偏置晶体管（18），并且具有与开关晶体管（14）相反的导电类型，但其栅极连接到开关晶体管（14）的栅极。 偏置晶体管（18）当接通时，向开关晶体管（14）的源极/漏极区域施加反向偏置电压，以使寄生结电容最小化，从而提高电容器（20）的温度稳定性。 还公开了一种二进制加权阵列（40）的开关可变电容器（20），以及并入这种阵列（40）的压控振荡器（50）。

公开(公告)号：US06172576B2

公开(公告)日：2001-01-09

申请号：US09285047

申请日：1999-04-02

Applicant: Takashi Endo ,  Manabu Oka

Inventor： Takashi Endo ,  Manabu Oka

IPC: H03B506

CPC classification number: H03B5/368 ,  H03B2201/0266 ,  H03B2201/0291 ,  H03J2200/10

Abstract: A voltage-controlled piezoelectric resonator may be implemented without requiring the use of a trimmer capacitor by virtue of the use of a capacitor array with or without an additional capacitor array, thus reducing the number of external parts. The capacitor array and the additional capacitor array can be packaged in an IC, thus enabling reduction in the size of the voltage-controlled piezoelectric resonator. The voltage-controlled piezoelectric resonator incorporating the capacitor array exhibits high stability both in terms of secular change and operation, which in turn ensures high stability of operation of a piezoelectric oscillation circuit incorporating this voltage-controlled piezoelectric resonator. An oscillation center frequency adjusting mechanism produces adjusting data, so that the adjustment of the oscillation center frequency can be effected purely electrically. Since mechanical adjusting operation that is essential in conventional arrangements is unnecessary, the time required for the adjustment of the oscillation center frequency is shortened to allow a reduction in the production cost of the voltage-controlled piezoelectric resonator.

Abstract translation: 可以通过使用具有或不具有附加电容器阵列的电容器阵列来实现压控压电谐振器而不需要使用微调电容器，从而减少外部部件的数量。 电容器阵列和附加电容器阵列可以封装在IC中，从而能够减小压控压电谐振器的尺寸。 包含电容器阵列的压控压电谐振器在长期变化和操作方面表现出高稳定性，这进而确保了具有该压控压电谐振器的压电振荡电路的高稳定性。 振荡中心频率调节机构产生调节数据，使得振荡中心频率的调节可以纯电动地进行。 由于不需要在常规布置中必不可少的机械调节操作，所以调整振荡中心频率所需的时间被缩短，从而可以降低压控压电谐振器的制造成本。

公开(公告)号：US5361407A

公开(公告)日：1994-11-01

申请号：US980549

申请日：1992-11-23

Applicant: Takeshi Sawada ,  Tadashi Sakai

Inventor： Takeshi Sawada ,  Tadashi Sakai

IPC: H03J7/02 ,  H03B1/00 ,  H03D1/24 ,  H03D7/16 ,  H03J7/06 ,  H04B1/26

CPC classification number: H03D7/161 ,  H03J7/065 ,  H04B1/26 ,  H03B2201/0291 ,  H03D1/24

Abstract: A superheterodyne receiver comprises a variable frequency oscillator of PLL (phase-locked loop) type for implementing a first local oscillator and a variable frequency oscillator not of PLL type for implementing a second local oscillator. At least the frequency of a first locally generated signal is varied at reception to vary a received frequency, the frequency of the first locally generated signal is set at frequency calibration to a level equal to the frequency of a first intermediate-frequency signal, the second intermediate-frequency signal is frequency-converted by a BFO signal to a signal having a frequency of voice band, and the frequency of a second locally generated signal is calibrated to set the frequency of the frequency-converted signal to a specified level.

Abstract translation: 超外差接收机包括用于实现第一本地振荡器的PLL（锁相环）类型的可变频率振荡器和不具有用于实现第二本地振荡器的PLL类型的可变频率振荡器。 至少第一本地生成的信号的频率在接收时变化以改变接收的频率，将第一本地生成的信号的频率设置为频率校准至等于第一中频信号的频率的电平，第二 中频信号由BFO信号被频率转换为具有语音频带频率的信号，并且校准第二本地产生的信号的频率以将频率转换信号的频率设置为指定的电平。

公开(公告)号：US20170194968A1

公开(公告)日：2017-07-06

申请号：US15385400

申请日：2016-12-20

Applicant: SEIKO EPSON CORPORATION

Inventor： Takemi YONEZAWA

IPC: H03L1/02 ,  H03B5/24 ,  H03L7/085 ,  H03B5/36

CPC classification number: H03L1/026 ,  H03B5/362 ,  H03B5/368 ,  H03B2200/004 ,  H03B2201/0208 ,  H03B2201/0291 ,  H03L1/00 ,  H03L1/028 ,  H03L1/04 ,  H03L7/085 ,  H03L7/093 ,  H03L7/099 ,  H03L7/0991 ,  H03L7/14 ,  H03L2207/50

Abstract: A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency, the oscillation frequency being a frequency set by using frequency control data, and a processor that is configured to perform a signal process on input frequency control data, and. The processor is configured to acquire the frequency control data from which an environmental change component is removed of the environmental change component and an aging change component by using environmental change component information, and perform aging correction on the basis of the frequency control data from which the environmental change component is removed.

公开(公告)号：US07782152B2

公开(公告)日：2010-08-24

申请号：US12241103

申请日：2008-09-30

Applicant: Hooman Darabi ,  Yuyu Chang ,  Zhimin Zhou ,  Morteza Vadipour

Inventor： Hooman Darabi ,  Yuyu Chang ,  Zhimin Zhou ,  Morteza Vadipour

IPC: H03B5/32

CPC classification number: H03L1/00 ,  H03B5/364 ,  H03B2201/0291 ,  H03J2200/10

Abstract: A frequency tuning device for use in a crystal oscillator circuit includes a first fine tuning array of capacitors, a second fine tuning array of capacitors and a coarse tuning array of capacitors coupled in parallel to produce a tuning capacitance for tuning the crystal oscillator. The first fine tuning array of capacitors includes a binary weighted switched capacitor network, the second fine tuning array of capacitors includes a thermometer coded switched capacitor network and the coarse tuning array of capacitors includes a binary weighted switched capacitor network with a different unit capacitance value than the first and second fine tuning arrays.

Abstract translation: 用于晶体振荡器电路的频率调谐装置包括电容器的第一微调阵列，电容器的第二微调阵列和并联耦合的电容器的粗调阵列，以产生用于调谐晶体振荡器的调谐电容。 电容器的第一微调阵列包括二进制加权开关电容器网络，第二微调阵列的电容器包括温度计编码的开关电容器网络，并且电容器的粗调阵列包括具有不同单位电容值的二进制加权开关电容器网络 第一和第二微调阵列。

公开(公告)号：US20090273404A1

公开(公告)日：2009-11-05

申请号：US12432743

申请日：2009-04-29

Applicant: Robert Hay

Inventor： Robert Hay

IPC: H03H9/00 ,  H01L41/08

CPC classification number: H03B5/326 ,  H03B2201/025 ,  H03B2201/0291 ,  H03B2201/031 ,  H03H9/6403

Abstract: A frequency adjustable surface acoustic wave oscillator uses circuitry in which the phase relationship between the corresponding input and output signals and the voltage applied to or received by transducer fingers is controlled in such a manner that the frequency of the surface acoustic wave oscillator is arbitrarily controlled over a wide range by digital means. This provides an oscillator that exhibits a wide tunable frequency range while providing low phase noise.

Abstract translation: 频率可调声表面波振荡器使用电路，其中相应的输入和输出信号之间的相位关系以及施加到或由换能器指状态接收的电压被控制为使声表面波振荡器的频率被任意控制 数字化的广泛范围。 这提供了一个振荡器，具有宽的可调谐频率范围，同时提供低相位噪声。

公开(公告)号：US20020168038A1

公开(公告)日：2002-11-14

申请号：US09823316

申请日：2001-03-30

Inventor： Morten Damgaard ,  William J. Domino ,  Rahul Magoon ,  Alyosha C. Molnar ,  Jeff Zachan

IPC: H04L027/06 ,  H03D003/24

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 in a frequency synthesizer are provided. One such system comprises a controllable oscillator and a frequency control circuit. The controllable oscillator is configured to generate an output signal that has a predefined frequency. The controllable oscillator is also configured with a plurality of operational states that are controlled by the frequency control circuit. Each operational state of the controllable oscillator defines a distinct frequency for the output signal of the controllable oscillator. The frequency control circuit receives the output signal of the controllable oscillator and determines the distinct frequency for the output signal that best approximates the predefined frequency. The frequency control circuit may also provide a control signal to the controllable oscillator that is configured to change the controllable oscillator 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。 一种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预定频率的不同频率的操作状态。

公开(公告)号：US20020089381A1

公开(公告)日：2002-07-11

申请号：US09757107

申请日：2001-01-08

Applicant: International Business Machines Corporation

Inventor： Allan L. Mullgrav JR. ,  Michael A. Sorna

IPC: H03B005/02 ,  H03L007/093 ,  H03L007/099

CPC classification number: H03L7/0995 ,  H03B2201/0291 ,  H03L7/0891 ,  H03L7/093

Abstract: A voltage controlled oscillator of a phase locked loop circuit having digitally controlled gain compensation. The digital control circuitry provides binary logic input to the voltage controlled oscillator for a digitally controlled variable resistance circuit, a digitally controlled variable current transconductor circuit, or differential transistor pairs having mirrored circuitry for adjusting the V-I gain. The latter configuration requires the voltage controlled oscillator to incorporate a source-coupled differential pair which is driven by a low pass filter capacitor output voltage, and connected to load transistors; a current source and a current mirror for generating a tail current; individual banks of transistors to mirror the load transistor currents; a digital-to-analog converter with control lines outputted there from, the digital-to-analog converter used to increase the amount of current allowed to flow to the transconductor output, the current being digitally increased and decreased corresponding to an amount of current pulled from the current source, and mirroring the current through at least one transistor mirror circuit.

Abstract translation: 具有数字控制增益补偿的锁相环电路的压控振荡器。 数字控制电路为压控振荡器提供二进制逻辑输入，用于数字控制的可变电阻电路，数字控制的可变电流跨导电路或具有调整V-I增益的镜像电路的差分晶体管对。 后一种配置要求压控振荡器并入由低通滤波电容器输出电压驱动并连接到负载晶体管的源极耦合差动对; 用于产生尾电流的电流源和电流镜; 晶体管的单独晶体管​​反映负载晶体管电流; 一个数模转换器，其中输出控制线，用于增加允许流向跨导体输出的电流量的数模转换器，电流根据拉出的电流量进行数字增减 从电流源，并通过至少一个晶体管镜电路镜像电流。

公开(公告)号：US6271731B2

公开(公告)日：2001-08-07

申请号：US37303597

申请日：1997-04-15

Applicant: ERICSSON INC

Inventor： KOSZARSKY CHRISTOPHER R

IPC: H03B1/00 ,  H03B5/12 ,  H03L7/099 ,  H03L7/10 ,  H03L7/18 ,  H03B5/08

CPC classification number: H03L7/18 ,  H03B5/1203 ,  H03B5/1231 ,  H03B5/1243 ,  H03B5/1262 ,  H03B2201/0291 ,  H03L7/099 ,  H03L7/10 ,  H03L2207/06

Abstract: A frequency synthesizer has a voltage controlled oscillator comprising a voltage controlled capacitor having a first terminal and a second terminal. A positive control voltage is applied to the first terminal of the voltage controlled capacitor and a negative control voltage is applied to the second terminal of the voltage controlled capacitor, causing the varactor to operate in a reverse biased state. A circuit for generating a negative control voltage is provided in a phase-locked loop circuit. The circuit includes a negative DC generator for generating a negative DC voltage from an AC signal, and a programmable variable attenuator for selectably attenuating the negative control voltage.

Abstract translation: 频率合成器具有压控振荡器，其包括具有第一端子和第二端子的压控电容器。 正压控制电压被施加到压控电容器的第一端，并且负控制电压被施加到压控电容器的第二端子，导致变容二极管以反向偏置状态工作。 用于产生负控制电压的电路设置在锁相环电路中。 该电路包括用于从AC信号产生负DC电压的负DC发生器和用于可选择地衰减负控制电压的可编程可变衰减器。