公开(公告)号：US20030025579A1

公开(公告)日：2003-02-06

申请号：US09917703

申请日：2001-07-31

Inventor： Kaare Tais Christensen

IPC: H03H011/00

CPC classification number: H03J5/244 ,  H01L23/4824 ,  H01L2924/0002 ,  H03B5/1212 ,  H03B5/1231 ,  H03B5/1265 ,  H03B5/1268 ,  H03B5/366 ,  H03B2201/0266 ,  H03J2200/10 ,  H01L2924/00

Abstract: A tuning circuit comprising a first reactance, a second reactance and a insulated gate field effect transistor having a gate arranged to receive a control signal. The first reactance is connected between the source of the field effect transistor and a first node. The second reactance has the same value as the first reactance and is connected between the drain of the field effect transistor and a second node. The first and second nodes are arranged so as to experience a balanced ac signal. Turning the field effect transistor on has the effect of making the first and second reactances effective in the circuit and vice versa.

公开(公告)号：US20020070815A1

公开(公告)日：2002-06-13

申请号：US10013288

申请日：2001-12-10

Inventor： Johann Traub

IPC: H03B005/00

CPC classification number: H03J5/244 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/1265 ,  H03B2201/0208 ,  H03B2201/0266

Abstract: An oscillator circuit with connectable capacitance makes it possible for the oscillator to change over between at least two frequencies. A switching unit is provided for the changeover. The switching unit has a first switch which is connected between the switchable capacitances, and also further switches, which are connected with respect to a supply voltage terminal. Compared with conventional oscillators that can be changed over, the novel circuit provides for the advantage that a particularly low forward resistance takes effect in the switched-on state of the connectable capacitances and particularly small parasitic capacitances nevertheless take effect in the switched-off state. The oscillator circuit can be implemented with a particularly small chip area since the switches can be integrated in a common transistor structure with a common control terminal. The oscillator circuit is particularly suitable for mobile radio applications.

Abstract translation: 具有可连接电容的振荡器电路可使振荡器在至少两个频率之间切换。 提供切换单元用于切换。 开关单元具有连接在可切换电容之间的第一开关，以及相对于电源电压端子连接的另外的开关。 与可以改变的常规振荡器相比，新颖的电路提供的优点是特别低的正向电阻在可连接电容的接通状态下起作用，特别是小的寄生电容在关断状态下起作用。 振荡器电路可以实现特别小的芯片面积，因为开关可以集成在具有公共控制端子的公共晶体管结构中。 振荡电路特别适用于移动无线电应用。

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：US5805029A

公开(公告)日：1998-09-08

申请号：US861605

申请日：1997-05-22

Applicant: Ulrich Theus ,  Norbert Greitschus

Inventor： Ulrich Theus ,  Norbert Greitschus

IPC: H03B1/00 ,  H03B5/36 ,  H03L7/099

CPC classification number: H03B5/364 ,  H03B2201/0266

Abstract: The invention relates to a digitally adjustable crystal oscillator having a quartz crystal and a monolithic integrated oscillator circuit including a series combination of a first frequency-adjusting capacitor C1 and a second frequency-adjusting capacitor C2 connected in parallel with the quartz crystal and comprising parallel-connected first capacitance stages and parallel-connected second capacitance stages, respectively, and an inverter circuit connected in parallel with the quartz crystal and comprising a feedback resistor R.sub.K, the output of the innverter circuit being connected to a load resistor. The inverter circuit comprises parallel-connected inverter stages, and switching elements are provided within the inverter stages and cqapacitor stages in such a way that a respective one of the inverter stages as well as a first capacitance stage C.sub.1i and a second capacitance stage C.sub.2i are switchable into or out of circuit by means of a control signal I.sub.i.

Abstract translation: 本发明涉及具有石英晶体和单片集成振荡电路的数字可调晶体振荡器，它包括与石英晶体并联连接的第一调频电容器C1和第二调频电容器C2的串联组合， 连接的第一电容级和并联的第二电容级，以及与石英晶体并联连接并包括反馈电阻器RK的逆变器电路，该变流器电路的输出连接到负载电阻器。 逆变器电路包括并联逆变级，并且在逆变器级和cqapitor级中设置开关元件，使得各个反相器级以及第一电容级C1i和第二电容级C2i可切换 通过控制信号Ii进入或断开电路。

公开(公告)号：US5764112A

公开(公告)日：1998-06-09

申请号：US703670

申请日：1996-08-27

Applicant: Jagdeep Bal ,  Christopher J. Bland

Inventor： Jagdeep Bal ,  Christopher J. Bland

IPC: H03B1/00 ,  H03B5/36 ,  H03K3/03 ,  H03B5/32

CPC classification number: H03B5/366 ,  H03K3/0307 ,  H03B2200/0026 ,  H03B2200/005 ,  H03B2200/0092 ,  H03B2201/0266 ,  H03B5/364 ,  H03J2200/10

Abstract: The present invention provides for a voltage-controlled crystal oscillator (VCXO) which, other than the crystal itself, is full integrated. The VCXO has a pre-amplifier block, a gain stage, a first MOS transistor, a first capacitor, a second MOS transistor, and a one second capacitor. The pre-amplifier block receives an input tuning voltage and the gain stage is connected across the terminals of the oscillating crystal. The first MOS transistor and first capacitor are connected between one of the terminals of the oscillating crystal and a reference voltage. The second MOS transistor and the second capacitor are connected between the second crystal terminal and the reference voltage. The gates of both MOS transistors are connected to the output node of the pre-amplifier block. The first and second MOS transistors connect the first and second capacitors to the first and second terminals of the gain stage for a portion of the time responsive to the input tuning voltage. Thus the oscillating crystal has a load capacitance, which varies according to the input tuning voltage, so that the frequency of the VCXO varies according to the input tuning voltage.

Abstract translation: 本发明提供一种电压控制晶体振荡器（VCXO），该晶体振荡器除晶体本身之外是完全集成的。 VCXO具有前置放大器模块，增益级，第一MOS晶体管，第一电容器，第二MOS晶体管和一个第二电容器。 前置放大器模块接收输入调谐电压，并且增益级跨越振荡晶体的端子。 第一MOS晶体管和第一电容器连接在振荡晶体的一个端子和参考电压之间。 第二MOS晶体管和第二电容器连接在第二晶体端子和参考电压之间。 两个MOS晶体管的栅极连接到前置放大器模块的输出节点。 第一和第二MOS晶体管响应于输入调谐电压将第一和第二电容器连接到增益级的第一和第二端子的一部分时间。 因此，振荡晶体具有根据输入调谐电压而变化的负载电容，使得VCXO的频率根据输入调谐电压而变化。

公开(公告)号：US5574406A

公开(公告)日：1996-11-12

申请号：US525689

申请日：1995-09-28

Applicant: Donald J. Sauer ,  William E. Rodda ,  Edward R. Campbell, III

Inventor： Donald J. Sauer ,  William E. Rodda ,  Edward R. Campbell, III

IPC: H03B1/00 ,  H03L7/099 ,  H03L7/113 ,  H03L7/14 ,  H04N7/12

CPC classification number: H03L7/14 ,  H03L7/0991 ,  H03L7/113 ,  H04N7/122 ,  H03B2201/02 ,  H03B2201/0266 ,  H03J2200/10

Abstract: In a phase-lock-loop circuit a frequency detector measures a frequency error between an oscillatory signal and a synchronizing signal in alternate horizontal line periods for generating a frequency error indicative signal. The frequency error indicative signal is applied to an oscillator for correcting the frequency error in other alternate horizontal line periods in a manner to prevent frequency error measurement and correction from occurring in the same horizontal line period.

Abstract translation: PCT No.PCT / US94 / 04307 Sec。 371 1995年9月28日第 102（e）1995年9月28日PCT PCT 1994年4月19日PCT公布。 公开号WO94 / 24769 日期1994年10月27日在锁相环电路中，频率检测器测量在交替的水平行周期中的振荡信号和同步信号之间的频率误差，以产生频率误差指示信号。 频率误差指示信号被施加到用于校正其它交替水平行周期中的频率误差的振荡器，以防止频率误差测量和校正发生在相同的水平行周期中。

公开(公告)号：US20230378911A1

公开(公告)日：2023-11-23

申请号：US17987153

申请日：2022-11-15

Applicant: Microchip Technology Incorporated

Inventor： Andrew Bottomley ,  David Simmonds

IPC: H03B5/24

CPC classification number: H03B5/24 ,  H03B2201/0266

Abstract: An device having an oscillator circuit modifiable between a first operating mode and a second operating mode, wherein the first operating mode has a first frequency accuracy and a first power consumption, wherein the second operating mode has a second frequency accuracy and a second power consumption, wherein the second frequency accuracy is more accurate than the first frequency accuracy and the second power consumption is higher than the first power consumption, and a control circuit in communication with the oscillator circuit to modify the operating mode of the oscillator circuit.

公开(公告)号：US20190123687A1

公开(公告)日：2019-04-25

申请号：US15791250

申请日：2017-10-23

Applicant: Analog Devices, Inc.

Inventor： Byungmoo Min ,  John A. Chiesa

IPC: H03B5/12

CPC classification number: H03B5/1265 ,  H03B5/1203 ,  H03B5/1231 ,  H03B5/1841 ,  H03B5/1847 ,  H03B2200/0034 ,  H03B2200/004 ,  H03B2200/005 ,  H03B2200/009 ,  H03B2201/0266

Abstract: An LC tank circuit, such as an LC tank circuit of a step-tuned voltage controlled oscillator, includes a plurality of switched capacitor banks and one or more inductors. A first switched capacitor bank switch in response to a range of control signals used to control the VCO output across a range of frequencies. A second switched capacitor bank can switch in response to a subset of the range of control signals used to control the VCO output across a subset of the range of frequencies. The control scheme for the first and second switched capacitor banks can improves the linearity of changes in the frequency of the output signal of the VCO.

公开(公告)号：US20170288650A1

公开(公告)日：2017-10-05

申请号：US15087723

申请日：2016-03-31

Applicant: ANALOG DEVICES GLOBAL

Inventor： Xin YANG ,  Tianting ZHAO ,  Baoxing CHEN

IPC: H03K3/013 ,  H03B5/12

CPC classification number: H03K3/013 ,  H03B5/08 ,  H03B5/12 ,  H03B5/1228 ,  H03B5/1231 ,  H03B5/1253 ,  H03B5/1265 ,  H03B5/1296 ,  H03B2200/0072 ,  H03B2201/0266

Abstract: Embodiments of the present disclosure may provide a circuit comprising a tank circuit. The tank circuit may include an inductor having a pair of terminals, a first pair of transistors, and a first pair of capacitors. Each transistor may be coupled between a respective terminal of the inductor and a reference voltage along a source-to-drain path of the transistor. Each capacitor may be provided in a signal path between an inductor terminal coupled to a respective first transistor in the first pair and a gate of a second transistor in the first pair.