公开(公告)号：US06836193B1

公开(公告)日：2004-12-28

申请号：US10325504

申请日：2002-12-20

申请人： Beomsup Kim ,  Cormac S. Conroy

发明人： Beomsup Kim ,  Cormac S. Conroy

IPC分类号： H03B508

CPC分类号： H03B5/00 ,  H03B2200/0048 ,  H03B2200/005 ,  H03J2200/10 ,  H03L7/099

摘要： A system and method are disclosed for generating a variable frequency output. A voltage controlled oscillator (VCO) is used. The VCO comprises a plurality of aggregate capacitor circuits, wherein each of the aggregate capacitor circuits has a collective capacitance, at least two of the collective capacitances have different values, and each of the aggregate capacitor circuits includes one or more individual capacitors wherein each of the individual capacitors are substantially the same size. The VCO further comprises a plurality of switches configured to select one or more aggregate capacitor circuits from among the plurality of aggregate capacitor circuits to form a discretely variable capacitor network having a discretely variable capacitance, wherein the discretely variable capacitor network is configured to cause an oscillator to generate a variable frequency as a result of the discretely variable capacitance.

摘要翻译： 公开了一种用于产生可变频率输出的系统和方法。 使用压控振荡器（VCO）。 VCO包括多个聚集电容器电路，其中每个聚集电容器电路具有集体电容，集体电容中的至少两个具有不同的值，并且每个聚集电容器电路包括一个或多个单独的电容器，其中 单个电容器的尺寸基本相同。 VCO还包括多个开关，其被配置为从多个聚集电容器电路中选择一个或多个聚集电容器电路，以形成具有离散可变电容的离散可变电容器网络，其中离散可变电容器网络被配置为使振荡器 作为离散可变电容的结果产生可变频率。

公开(公告)号：US06784753B2

公开(公告)日：2004-08-31

申请号：US10144528

申请日：2002-05-13

申请人： Dominicus Martinus Wilhelmus Leenaerts ,  Eise Carel Dijkmans

发明人： Dominicus Martinus Wilhelmus Leenaerts ,  Eise Carel Dijkmans

IPC分类号： H03B508

CPC分类号： H03C3/0966 ,  H03B5/1212 ,  H03B5/1221 ,  H03B5/1228 ,  H03B5/1253 ,  H03B5/1293 ,  H03B2201/0208 ,  H04B1/04

摘要： The invention relates to a method for modulating an output voltage of a transmitter circuit comprising a voltage controlled oscillator, a digital/analog converter and an antenna circuit, the method comprising the method comprising sending an output signal of sufficient power from the voltage controlled oscillator directly to the antenna circuit and directly modulating a frequency of the output signal of the voltage controlled oscillator. The invention furthermore relates to a transmitter circuit comprising a voltage controlled oscillator having a tank circuit, a digital/analog converter and an antenna circuit, wherein the voltage controlled oscillator is adapted to send an output signal of sufficient power directly to the antenna circuit and wherein the digital/analog converter is arranged to modulate an output frequency of the voltage controlled oscillator. A capacitive load circuit may be connected to the tank circuit or a crystal oscillator circuit of the voltage controlled oscillator for modulating the frequency of the voltage controlled oscillator.

摘要翻译： 本发明涉及一种用于调制包括压控振荡器，数字/模拟转换器和天线电路的发射机电路的输出电压的方法，该方法包括直接从压控振荡器发送足够功率的输出信号 到天线电路并直接调制压控振荡器的输出信号的频率。 本发明还涉及一种包括具有振荡电路，数字/模拟转换器和天线电路的压控振荡器的发射机电路，其中压控振荡器适于将足够功率的输出信号直接发送到天线电路，其中 数字/模拟转换器被布置成调制压控振荡器的输出频率。 容性负载电路可以连接到用于调制压控振荡器的频率的压控振荡器的振荡电路或晶体振荡器电路。

公开(公告)号：US06509805B2

公开(公告)日：2003-01-21

申请号：US09810663

申请日：2001-03-19

申请人： Toshiyuki Ochiai

发明人： Toshiyuki Ochiai

IPC分类号： H03B508

CPC分类号： H03B5/1228 ,  H03B5/1215 ,  H03B5/1243 ,  H03B5/1265

摘要： A control voltage Vin that has been input is sequentially reduced at NMOS's 111˜113 constituting means for voltage reduction. The individual voltages resulting from the voltage reduction are applied to control electrodes of MOS varactors 211˜213 constituting voltage-controlled variable-capacitance elements which are connected in parallel and, thus, the capacitance values of the individual MOS varactors 211˜213 are determined. An LC resonance circuit constituted of the MOS varactors 211˜213 and a coil 22 resonates at a specific frequency, NMOS's 23 and 24 constituting means for switching engage in on/off operation and oscillation occurs at an oscillation frequency corresponding to the voltage Vin resulting in an oscillation signal output through output terminals 3 and 4. Thus, an LC resonance circuit that allows the rate at which the capacitance values of the voltage-controlled variable-capacitance elements change to be set freely in correspondence to the particulars of design and a high-performance voltage-controlled oscillation circuit (VCO) that employs this LC resonance circuit and enables good control are provided.

公开(公告)号：US06348841B1

公开(公告)日：2002-02-19

申请号：US09465219

申请日：1999-12-15

申请人： Puay Hoe See

发明人： Puay Hoe See

IPC分类号： H03B508

CPC分类号： H03L7/099 ,  H03B5/1206 ,  H03B5/1243 ,  H03L2207/06

摘要： A Voltage Controlled Oscillator (VCO) with the ability to tune its operating frequency over a wide range using a limited control voltage range. The VCO implements a novel resonant circuit that provides the wide frequency tuning range and simultaneously provides increased immunity to induced low frequency noise. The resonant circuit utilizes an element configuration that includes high pass filters on each input to the resonant circuit. Varactor diodes are used to couple a conventional tuning circuit to the remainder of the resonant circuit. This configuration allows the resonant frequency to tune over a wide range using a limited control voltage range.

摘要翻译： 一个压控振荡器（VCO），能够使用有限的控制电压范围在宽范围内调节其工作频率。 VCO实现了一种新颖的谐振电路，提供宽频率调谐范围，同时提供增强的抗感应低频噪声的抗扰度。 谐振电路利用在谐振电路的每个输入上包括高通滤波器的元件配置。 变容二极管用于将常规调谐电路耦合到谐振电路的其余部分。 该配置允许谐振频率在有限的控制电压范围内在宽范围内调谐。

公开(公告)号：US06819193B2

公开(公告)日：2004-11-16

申请号：US10407909

申请日：2003-04-02

申请人： German Gutierrez

发明人： German Gutierrez

IPC分类号： H03B508

CPC分类号： H03B5/1228 ,  H03B5/1212 ,  H03B5/1253 ,  H03B5/1256

摘要： The present invention generally relates to voltage-controlled oscillators. More specifically, the present invention relates to method and circuitry for implementing a differentially tuned varactor-inductor oscillator. In one exemplary embodiment, the present invention includes an LC tank circuit having a couple of terminals, a first and second capacitors, and a first and second varactors. The first and second varactors are connected in series forming a first and a second node. The first capacitor connects the first node and one terminal of the LC tank circuit. The second capacitor connects the second node and the other terminal of the LC tank circuit. A pair of differential input control signals is applied across the first and the second varactors, respectively, to tune the LC tank circuit thereby generating an oscillator output.

公开(公告)号：US06801097B2

公开(公告)日：2004-10-05

申请号：US10199898

申请日：2002-07-18

申请人： Raymond C. Wallace

发明人： Raymond C. Wallace

IPC分类号： H03B508

CPC分类号： H03B5/1206 ,  H03B5/1243 ,  H03B2201/0208 ,  H03B2201/0275 ,  H03J3/185 ,  H03J2200/38 ,  H03L2207/06

摘要： A wideband Voltage Controlled Oscillator (VCO) uses a resonant circuit tunable over a wide range of resonant frequencies. The resonant circuit includes voltage variable elements such that the resonant frequency, and thus the frequency of oscillation, may be electronically tuned. The voltage variable elements are arranged such that multiple control voltages determine the resonant frequency. A first control voltage is applied to a first set of tuning elements and operates as a coarse control of the resonant frequency. A second control voltage is applied to a second set of tuning elements and operates as a fine control of the resonant frequency. Using multiple control voltages on multiple elements allows for a wideband VCO while maintaining a low VCO gain.

公开(公告)号：US06661301B2

公开(公告)日：2003-12-09

申请号：US10013288

申请日：2001-12-10

申请人： Johann Traub

发明人： Johann Traub

IPC分类号： H03B508

CPC分类号： H03J5/244 ,  H03B5/1215 ,  H03B5/1228 ,  H03B5/1243 ,  H03B5/1265 ,  H03B2201/0208 ,  H03B2201/0266

摘要： 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.

公开(公告)号：US06417740B1

公开(公告)日：2002-07-09

申请号：US09791444

申请日：2001-02-22

申请人： Do Manh Anh ,  Zhao Ruiyan ,  Ma Jian-Guo ,  Yeo Kiat Seng ,  Chew Kok Wai

发明人： Do Manh Anh ,  Zhao Ruiyan ,  Ma Jian-Guo ,  Yeo Kiat Seng ,  Chew Kok Wai

IPC分类号： H03B508

CPC分类号： H03B5/1228 ,  H03B5/1215 ,  H03B5/1253 ,  H03B5/1293 ,  H03B2201/0208

摘要： A variable frequency signal generator, in the form of a voltage controlled oscillator, provides wide-band and/or multi-band output frequency operation using two control voltage inputs. A pair of LC oscillator circuits are cross-coupled through a transconductance control circuit. The oscillator circuits provide quadrature output frequency signals. The oscillator circuits include MOSFET varactors controllable by a first control voltage which can be used to drive the varactors into inversion or depletion operating modes which correspond to respective output signal frequency bands. A second control voltage is provided to the transconductance control circuit to control currents injected from each oscillator to the other, thereby selecting a particular output frequency within the range of the frequency band determined by the first control voltage. A control voltage compensation circuit is included to prevent variations in the second control voltage from altering the frequency band range selected by the first control voltage. Output signals with frequencies in the range 850 MHz to 2.4 GHz with favorable harmonic content and low phase noise are possible with relatively low supply voltages.

摘要翻译： 以压控振荡器形式的可变频率信号发生器使用两个控制电压输入提供宽带和/或多频带输出频率操作。 一对LC振荡器电路通过跨导控制电路交叉耦合。 振荡器电路提供正交输出频率信号。 振荡器电路包括可由第一控制电压控制的MOSFET变容二极管，其可用于将变容二极管驱动成对应于各个输出信号频带的反相或耗尽工作模式。 向跨导控制电路提供第二控制电压以控制从每个振荡器注入的电流到另一振荡器，从而在由第一控制电压确定的频带的范围内选择特定的输出频率。 包括控制电压补偿电路以防止第二控制电压的变化改变由第一控制电压选择的频带范围。 频率在850MHz至2.4GHz范围内的输出信号具有良好的谐波含量和低相位噪声，可以在较低的电源电压下进行。

公开(公告)号：US06667666B2

公开(公告)日：2003-12-23

申请号：US10235394

申请日：2002-09-05

申请人： Vasil Uzunoglu

发明人： Vasil Uzunoglu

IPC分类号： H03B508

CPC分类号： H03L7/24 ,  H03B5/1203 ,  H03B5/1231 ,  H03B5/1296 ,  H03B2200/0074 ,  H03L7/083 ,  H04L7/027

摘要： A modification of the synchronous oscillator is described, having regenerative positive feedback. The circuit includes an amplifier, a high-Q tank circuit, and a conventional synchronous oscillator feedback network. An additional feedback path provides a negative impedance conversion effect.

摘要翻译： 描述了具有再生正反馈的同步振荡器的修改。 该电路包括放大器，高Q槽电路和常规的同步振荡器反馈网络。 额外的反馈路径提供负阻抗转换效果。

公开(公告)号：US06621365B1

公开(公告)日：2003-09-16

申请号：US10115672

申请日：2002-04-03

申请人： Juha Hallivuori ,  Pauli Seppinen

发明人： Juha Hallivuori ,  Pauli Seppinen

IPC分类号： H03B508

CPC分类号： H03J5/244 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03B2201/0208 ,  H03B2201/0266

摘要： An RF VCO (260A) forms, in the preferred embodiment, a part of a dual mode mobile station (100). Also disclosed is a method for operating the VCO. The VCO is operated in a first frequency band using a first inductance (300A) that forms part of a first resonant circuit (parallel resonance), and the VCO is switched for operation to a second frequency band by the closing a switch (M5) that causes a second resonant circuit (serial resonance) to be inductively coupled to the first resonant circuit. The second resonant circuit includes a second inductance (300B), and preferably includes at least one frequency tunable component, such as a varactor (VR3, VR4), for adjusting the resonant frequency of the second resonant circuit. The second inductance is center tapped, and the switch, such as a MOS transistor, is coupled in series between two ends of the center tapped inductance. The first frequency band may include 3.6 GHz (a double frequency GSM band) and the second frequency band may include 4.3 GHz (a double frequency WCDMA band). Additional operational bands can be also be used. In the preferred embodiment the first inductance forms part of a transformer primary fabricated in an integrated circuit, and the second inductance forms part of the transformer secondary that is fabricated in the integrated circuit so as to underlie the first inductance. A signal detector (D1, D2) may be provided that is responsive to a signal induced in the transformer secondary, and the signal detector has an output coupled to a closed loop control circuit (310) for controlling a magnitude of a signal output from the VCO. A further input to the closed loop control circuit may be a signal that is indicative of communication channel conditions, and the current consumption of the VCO circuit is maintained at a level that is adequate to ensure operation with the communication channel conditions. A passive buffering circuit (320) is provided for coupling an output of the VCO circuit to a further circuit, such as a mixer, thereby reducing the total VCO current considerably.