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1. 发明授权

US06750726B1 Oscillator circuit with flicker noise suppression and method for operating the same 失效
标题翻译：具有闪烁噪声抑制的振荡器电路及其操作方法
公开(公告)号：US06750726B1
公开(公告)日：2004-06-15
申请号：US10301099
申请日：2002-11-20
申请人： Chih-Jen Hung , Ravindra Shenoy , Samuel W. Sheng
发明人： Chih-Jen Hung , Ravindra Shenoy , Samuel W. Sheng
IPC分类号： H03B508
CPC分类号： H03B5/1228 , H03B5/1215 , H03B5/1221 , H03B5/124 , H03B2202/027
摘要： An oscillator circuit includes an electrical load, a first metal oxide semiconductor (MOS) devise, a second MOS device, and a negative feedback circuit. The electrical load is coupled between a first node and a second node. The first MOS device is coupled between the first node and a third node, and controls a first current flowing from the first node to the third node. The second MOS device is coupled between the second node and a fourth node, and controls a second current flowing from the second node to the fourth node. A positive feedback circuit is formed with the first and second MOS devices. The positive feedback circuit has inputs from the first and second nodes and outputs to the first and second MOS devices. The negative feedback circuit has inputs from the third and fourth nodes and outs to the first and second MOS devices.
摘要翻译：振荡电路包括电负载，第一金属氧化物半导体（MOS）器件，第二MOS器件和负反馈电路。电负载耦合在第一节点和第二节点之间。第一MOS器件耦合在第一节点和第三节点之间，并且控制从第一节点流向第三节点的第一电流。第二MOS器件耦合在第二节点和第四节点之间，并且控制从第二节点流向第四节点的第二电流。正反馈电路与第一和第二MOS器件形成。正反馈电路具有来自第一和第二节点的输入，并输出到第一和第二MOS器件。负反馈电路具有来自第三和第四节点的输入，并且输出到第一和第二MOS器件。

2. 发明授权

US5175884A Voltage controlled oscillator with current control 失效
标题翻译：带电流控制的压控振荡器
公开(公告)号：US5175884A
公开(公告)日：1992-12-29
申请号：US531668
申请日：1990-06-01
申请人： Jose I. Suarez
发明人： Jose I. Suarez
IPC分类号： H03B1/00 , H03B1/04 , H03B5/12 , H03L7/099 , H03L7/183
CPC分类号： H03L7/183 , H03B5/1203 , H03B5/1231 , H03B5/1243 , H03L7/099 , H03B2200/004 , H03B2200/0062 , H03B2200/0088 , H03B2201/0208 , H03B2202/027 , H03L2207/06
摘要： An apparatus (200) and method for adjusting the bias current of the oscillating device (320) in a VCO (202) in response to changes in the tuning voltage of the VCO to achieve reduced sideband noise.
摘要翻译：一种用于响应于VCO的调谐电压的变化来调节VCO（202）中的振荡器件（320）的偏置电流以实现降低的边带噪声的装置（200）和方法。

3. 发明授权

US5164686A High-frequency oscillator having a field-effect transistor with a stepwise increasing active layer carrier concentration 失效
标题翻译：具有增加主动层载流子浓度的场效应晶体管的高频振荡器
公开(公告)号：US5164686A
公开(公告)日：1992-11-17
申请号：US791738
申请日：1991-11-15
申请人： Nobuo Shiga
发明人： Nobuo Shiga
IPC分类号： H01L21/22 , H03B1/04 , H03B5/02 , H03B5/18
CPC分类号： H03B5/1876 , H03B2200/0028 , H03B2200/0058 , H03B2200/0088 , H03B2200/009 , H03B2202/027 , H03B2202/06 , H03B5/1852
摘要： This invention is a high-frequency oscillator including a MESFET, wherein a GaAs MESFET, in which the doping profile of an active layer has a pulse-doped structure, is used as the MESFET. Since the GaAs MESFET is formed to have the pulse-doped structure, the change in transconductance with respect to the change in gate resistance remains constant at gate voltages within a predetermined range. When the gate voltage is set to be a voltage within this predetermined range, a capacitance change with respect to a gate voltage across a gate and a source is reduced. FM noise proportional to the magnitude of this capacitance change is reduced. Accurate information transmission is not interfered with unlike in conventional arrangements.

4. 发明授权

US4580109A Low noise oscillator 失效
标题翻译：低噪声振荡器
公开(公告)号：US4580109A
公开(公告)日：1986-04-01
申请号：US674210
申请日：1984-11-23
申请人： Larry R. Lockwood
发明人： Larry R. Lockwood
IPC分类号： H03B5/12 , H03B1/04 , H03B5/18 , H03B5/00
CPC分类号： H03B5/1805 , H03B2202/012 , H03B2202/027
摘要： A circuit configuration is provided for reducing noise sidebands in the output of an oscillator due to modulation of the oscillation signal by characteristic noise produced by the amplifying element. A gallium arsenide field-effect transistor that produces characteristic noise is operated as a linear amplifier. Positive feedback to the input of the amplifier is provided by a resonator. The amplitude of the oscillation signal is limited by a distinct limiting circuit in the feedback loop, the input to which is isolated from the amplifier by a high pass filter, thereby divorcing the non-linear limiting function of the oscillator from the amplifying function where noise is generated.
摘要翻译：提供了一种电路配置，用于通过由放大元件产生的特征噪声调制振荡信号来减少振荡器的输出中的噪声边带。产生特征噪声的砷化镓场效应晶体管作为线性放大器工作。通过谐振器提供对放大器的输入的正反馈。振荡信号的幅度受到反馈环路中不同限制电路的限制，其输入通过高通滤波器与放大器隔离，从而使振荡器的非线性限制功能与放大功能离散，噪声被生成。

5. 发明公开

US20230208357A1 OSCILLATOR WITH BIASED CROSS-COUPLED TRANSISTORS, A CURRENT SOURCE, A TAIL RESISTOR AND A TAIL CAPACITOR 审中-公开
公开(公告)号：US20230208357A1
公开(公告)日：2023-06-29
申请号：US17928316
申请日：2020-06-04
申请人： Telefonaktiebolaget LM Ericsson (publ)
发明人： Pietro ANDREANI
IPC分类号： H03B5/12
CPC分类号： H03B5/1215 , H03B5/1228 , H03B5/124 , H03B2200/009 , H03B2202/027
摘要： Embodiments disclosed herein relate to oscillators including methods of operating the same, for example for use in radio frequency circuits. In an embodiment, an oscillator has cross-coupled transistors connected between a resonant circuit and a tail circuit. The resonant circuit and tail circuit have respective supply connections for powering the oscillator with an external power supply and the cross-coupled transistors have a bias circuit coupled to respective gates of the cross-coupled transistors and arranged to bias said transistors in an active region of operation. The tail circuit has a current source, a tail capacitor and a tail resistor coupled between a common node of the cross-coupled transistors and the supply connection of the tail circuit.

6. 发明授权

US5697095A Tuner capable of reducing power consumption and heat generation 失效
标题翻译：调谐器能够降低功耗和发热
公开(公告)号：US5697095A
公开(公告)日：1997-12-09
申请号：US447250
申请日：1995-05-22
申请人： Syuuji Matsuura
发明人： Syuuji Matsuura
IPC分类号： H03B1/00 , H03B1/02 , H03B1/04 , H03B5/12 , H03B5/18 , H04B1/16 , H04B1/26
CPC分类号： H04B1/1607 , H03B5/1221 , H03B5/1231 , H03B5/1243 , H03B5/1847 , H03B1/02 , H03B2200/0034 , H03B2200/004 , H03B2200/0082 , H03B2200/0088 , H03B2201/0208 , H03B2201/0225 , H03B2202/027 , H03B2202/03 , H03B2202/086
摘要： There is provided a tuner capable of improving reliability thereof with reduced power consumption and reduced heat generation. In the tuner, one wideband amplifier circuit including one transistor constitutes a buffer amplifier. The wideband amplifier circuit is coupled with a first local oscillator circuit in a DC coupling style. With the above-mentioned arrangement, the buffer amplifier is allowed to have a simplified circuit construction and reduce noises. Since the amplifier circuit and the local oscillator circuit are coupled with each other in a DC coupling style, reduced power consumption can be achieved.
摘要翻译：提供了一种能够在降低功耗并减少发热的情况下提高可靠性的调谐器。在调谐器中，包括一个晶体管的一个宽带放大器电路构成缓冲放大器。宽带放大器电路以直流耦合方式与第一本地振荡器电路耦合。通过上述结构，缓冲放大器被允许具有简化的电路结构并降低噪声。由于放大器电路和本地振荡器电路以直流耦合方式彼此耦合，所以可以实现降低的功耗。

7. 发明授权

US5130675A Voltage-controlled oscillator 失效
标题翻译：电压控制振荡器
公开(公告)号：US5130675A
公开(公告)日：1992-07-14
申请号：US754826
申请日：1991-09-04
申请人： Hideo Sugawara
发明人： Hideo Sugawara
IPC分类号： H03L7/099 , H03B1/00 , H03B1/04 , H03B5/18
CPC分类号： H03B5/1876 , H03B2200/0024 , H03B2200/004 , H03B2200/0062 , H03B2201/0208 , H03B2202/027 , H03B2202/076 , H03B5/1852
摘要： A voltage-controlled oscillator according to the present invention comprises: a transistor, where the drain electrode is grounded, the gate electrode is connected to a resonator whose resonant frequency is adjustable according to a voltage applied to a voltage-dependent capacitance diode electromagnetically coupled with the resonator, an output signal is output from the source electrode; a resistor connected in gate bias circuit or source voltage supply circuit for detecting a low-frequency noise component generated in the transistor, where the detected low-frequency noise component is amplified and fed back to the voltage-dependent capacitance diode so as to cancel a phase-noise component generated in the voltage-controlled oscillator. The above-described voltage-controlled oscillator may be further provided with a reference crystal oscillator to which the voltage-controlled oscillator is phase-locked. Thus, a microwave voltage-controlled oscillator excellent in phase-noise characteristics of the oscillated frequency is accomplished though there is employed a GaAs FET which is not good in a low-frequency noise characteristic.

8. 发明授权

US4999589A Low phase noise voltage controlled oscillator 失效
标题翻译：低相位噪声压控振荡器
公开(公告)号：US4999589A
公开(公告)日：1991-03-12
申请号：US473772
申请日：1990-02-02
申请人： Marcus DaSilva
发明人： Marcus DaSilva
IPC分类号： H03B1/00 , H03B1/04 , H03B5/18
CPC分类号： H03B5/1805 , H03B2201/0208 , H03B2202/017 , H03B2202/027
摘要： A varactor diode tuned voltage controlled oscillator which simultaneously optimizes several techniques to minimize AM to FM conversion in the LC resonant circuit to provide an RF signal having minimum phase noise is described. A high gain current limiting RF amplifier is coupled to a high Q, high capacitance, low impedance LC resonant circuit by an impedance transformation network to provide a high tank circulating power having minimum RF voltage fluctuations. The RF voltage across the varactor tuning diodes is further reduced by connecting two varactor diodes in series, back-to-back, or by connecting a fixed capacitance in series with the parallel connected varactor diodes.
摘要翻译：描述了变容二极管调谐压控振荡器，其同时优化了几种技术以最小化LC谐振电路中的AM至FM转换以提供具有最小相位噪声的RF信号。高增益限流RF放大器通过阻抗变换网络耦合到高Q，高电容，低阻抗LC谐振电路，以提供具有最小RF电压波动的高容量循环功率。通过串联连接两个变容二极管，背靠背连接，或者通过连接与并联连接的变容二极管串联的固定电容来进一步减少变容二极管调谐二极管两端的射频电压。

9. 发明授权

US4939481A Low phase noise voltage controlled oscillator 失效
标题翻译：低相位噪声压控振荡器
公开(公告)号：US4939481A
公开(公告)日：1990-07-03
申请号：US212849
申请日：1988-06-29
申请人： Marcus DaSilva
发明人： Marcus DaSilva
IPC分类号： H03B1/00 , H03B1/04 , H03B5/18
CPC分类号： H03B5/1805 , H03B2201/0208 , H03B2202/017 , H03B2202/027
摘要： A varactor diode tuned voltage controlled oscillator which simultaneously optimizes several techniques to minimize AM to FM conversion in the LC resonant circuit to provide an RF signal having minimum phase noise is described. A high gain current limiting RF amplifier is coupled to a high Q, high capacitance, low impedance LC resonant circuit by an impedance transformation network to provide a high tank circulating power having minimum RF voltage fluctuations. The RF voltage across the varactor tuning diodes is further reduced by connecting two varactor diodes in series, back-to-back, or by connecting a fixed capacitance in series with the parallel connected varactor diodes.
摘要翻译：描述了变容二极管调谐压控振荡器，其同时优化了几种技术以最小化LC谐振电路中的AM至FM转换以提供具有最小相位噪声的RF信号。高增益限流RF放大器通过阻抗变换网络耦合到高Q，高电容，低阻抗LC谐振电路，以提供具有最小RF电压波动的高容量循环功率。通过串联连接两个变容二极管，背靠背连接，或者通过连接与并联连接的变容二极管串联的固定电容来进一步减少变容二极管调谐二极管两端的射频电压。

10. 发明授权

US08866557B2 XTAL oscillator 有权
公开(公告)号：US08866557B2
公开(公告)日：2014-10-21
申请号：US13601422
申请日：2012-08-31
申请人： Chang-Hyeon Lee , Lindel Kabalican
发明人： Chang-Hyeon Lee , Lindel Kabalican
IPC分类号： H03B5/36
CPC分类号： H03B5/364 , H03B2200/0034 , H03B2200/0036 , H03B2200/0062 , H03B2200/0088 , H03B2202/027
摘要： Resistor bias circuitry is included in components of an XTAL oscillator system to reduce 1/f noise. An XTAL oscillator includes a resistor bias circuit attached to the XTAL core. A common mode feedback OP amp connected to the XTAL core also includes a resistor bias circuit. An XTAL oscillator chain includes an XTAL core, common mode feedback OP amp, common mode logic buffer (CML BF), and differential to CMOS converter (D2C) each with resistor bias circuitry.

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