公开(公告)号：US20180254742A1

公开(公告)日：2018-09-06

申请号：US15448360

申请日：2017-03-02

申请人： SPREADTRUM COMMUNICATIONS USA INC.

发明人： Aram AKHAVAN ,  Daniel RALSTON

IPC分类号： H03B5/36 ,  H03K3/03

CPC分类号： H03B5/364 ,  H03B5/362 ,  H03B2200/0082 ,  H03L7/00

摘要： A low-power crystal oscillator circuit operating in Class B, with positive feedback and a step-down voltage regulator.

公开(公告)号：US20180145665A1

公开(公告)日：2018-05-24

申请号：US15358782

申请日：2016-11-22

申请人： Jonathan Ephraim David Hurwitz ,  Sean B. Brennan

发明人： Jonathan Ephraim David Hurwitz ,  Sean B. Brennan

IPC分类号： H03K4/502

CPC分类号： H03K4/502 ,  H03B1/00 ,  H03B5/20 ,  H03B2200/0082 ,  H03K3/0231 ,  H03K3/0315 ,  H03L7/0995

摘要： A relaxation oscillator can provide a smaller and cheaper alternative to a crystal oscillator circuit in a wide variety of applications. A sawtooth relaxation oscillator can include overshoot error integration. Separate and distinct oscillator capacitor charging, overshoot error integration, and reset phases can be provided using separate comparators for first and second oscillation capacitors. Potential advantages can include high accuracy high-frequency clock, convenient trimming during initial calibration, clock frequency stability over temperature and time, fast startup with low overshoot, high power supply rejection, low power, or low noise/jitter. The oscillator can charge an oscillation capacitor up to a target voltage, then interrupt charging before beginning an error integration phase that adjusts the target voltage by integrating an overshoot error of a voltage on the oscillation capacitor. After completing the overshoot error integration, the voltage on the oscillation capacitor can be reset. The techniques described are believed to be capable of improving clock frequency accuracy and other characteristics.

公开(公告)号：US20170294915A1

公开(公告)日：2017-10-12

申请号：US15355073

申请日：2016-11-18

申请人： MEDIATEK INC.

发明人： Hao-Wei Huang ,  Yen-Tso Chen ,  Song-Yu Yang

IPC分类号： H03L5/00 ,  H03B5/36 ,  H03B5/24

CPC分类号： H03L5/00 ,  H03B5/06 ,  H03B5/1262 ,  H03B5/24 ,  H03B5/364 ,  H03B2200/0082 ,  H03B2200/009 ,  H03B2200/0094 ,  H03B2201/0266 ,  H03L3/00

摘要： An oscillator circuit has a reconfigurable oscillator amplifier. The reconfigurable oscillator amplifier is used to be coupled to a resonant circuit in parallel. The reconfigurable oscillator amplifier supports different circuit configurations for different operation modes, respectively. The reconfigurable oscillator amplifier has at least one circuit component shared by the different circuit configurations. The reconfigurable oscillator amplifier employs one of the different circuit configurations under one of the different operation modes.

公开(公告)号：US09722538B2

公开(公告)日：2017-08-01

申请号：US15015501

申请日：2016-02-04

申请人： SII Semiconductor Corporation

发明人： Masaya Murata ,  Makoto Mitani ,  Kotaro Watanabe

IPC分类号： H03B5/32 ,  H03B5/36 ,  H03L5/00 ,  H03L1/02 ,  H03L7/08

CPC分类号： H03B5/364 ,  H03B2200/0082 ,  H03L1/02 ,  H03L5/00 ,  H03L7/0802

摘要： Provided are a constant voltage circuit configured to, when a power supply voltage is low, detect a leakage current to output a stable voltage at a power supply voltage level, and a crystal oscillation circuit using the constant voltage circuit. The constant voltage circuit includes a leakage current detection circuit including a PMOS transistor for monitoring a leakage current, which has a gate and a source being grounded. When a leakage current is detected, even with a constant voltage power supply, a voltage sufficient for turning on an output transistor of the constant voltage circuit can be applied to a gate of the output transistor.

公开(公告)号：US20170070139A1

公开(公告)日：2017-03-09

申请号：US15357033

申请日：2016-11-21

申请人： Dialog Semiconductor (UK) Limited

发明人： Stefano D'Amico ,  Francesco Dalena ,  Mirko Pasca

IPC分类号： H02M3/07 ,  H03B5/12

CPC分类号： H02M3/07 ,  H03B5/1212 ,  H03B5/1228 ,  H03B2200/0082

摘要： A DC-DC converter comprises an oscillator and a charge pump, to ensure operation at low voltage. The oscillator comprises one or more source degenerated transistors comprising a degeneration impedance located between a source of the transistor and a ground connection. The degeneration impedance comprises an inductor and a capacitor. Also provided is an energy harvesting device comprising such a DC-DC converter.

摘要翻译： DC-DC转换器包括振荡器和电荷泵，以确保在低电压下工作。 振荡器包括一个或多个源极退化晶体管，其包括位于晶体管的源极与接地连接之间的退化阻抗。 退化阻抗包括电感器和电容器。 还提供了包括这种DC-DC转换器的能量收集装置。

公开(公告)号：US09531323B1

公开(公告)日：2016-12-27

申请号：US14748946

申请日：2015-06-24

申请人： QUALCOMM Incorporated

发明人： Alireza Khalili ,  Yashar Rajavi ,  Mazhareddin Taghivand

IPC分类号： H03B5/32 ,  H03B5/36

CPC分类号： H03B5/364 ,  H03B5/1212 ,  H03B5/1228 ,  H03B2200/0036 ,  H03B2200/0082

摘要： A circuit includes: first and second output terminals; a reference resonator coupled between the first and second output terminals; a cross-coupled oscillation unit coupled to the first and second output terminals; a first MOSFET diode coupled to the cross-coupled oscillation unit, the first MOSFET diode including a first transistor, a first resistor coupled between gate and drain terminals of the first transistor, and a first capacitor; a second MOSFET diode coupled to the cross-coupled oscillation unit, the second MOSFET diode including a second transistor, a second resistor coupled between gate and drain terminals of the second transistor, and a second capacitor cross coupled between the drain terminal of the second transistor and the gate terminal of the first transistor, wherein the first capacitor is cross coupled between the drain terminal of the first transistor and the gate terminal of the second transistor.

摘要翻译： 电路包括：第一和第二输出端子; 耦合在所述第一和第二输出端子之间的参考谐振器; 耦合到所述第一和第二输出端子的交叉耦合振荡单元; 耦合到所述交叉耦合振荡单元的第一MOSFET二极管，所述第一MOSFET二极管包括第一晶体管，耦合在所述第一晶体管的栅极和漏极端子之间的第一电阻器和第一电容器; 耦合到交叉耦合振荡单元的第二MOSFET二极管，所述第二MOSFET二极管包括第二晶体管，耦合在所述第二晶体管的栅极和漏极端子之间的第二电阻器以及耦合在所述第二晶体管的漏极端子之间的第二电容器 和第一晶体管的栅极端子，其中第一电容器交叉耦合在第一晶体管的漏极端子和第二晶体管的栅极端子之间。

公开(公告)号：US09374100B2

公开(公告)日：2016-06-21

申请号：US12496422

申请日：2009-07-01

申请人： Dongmin Park ,  Jafar Savoj

发明人： Dongmin Park ,  Jafar Savoj

IPC分类号： H04B1/06 ,  H03L7/24 ,  H03B27/00 ,  H03B5/12

CPC分类号： H03L7/24 ,  H03B5/1215 ,  H03B5/1228 ,  H03B19/14 ,  H03B27/00 ,  H03B2200/007 ,  H03B2200/0074 ,  H03B2200/0078 ,  H03B2200/0082

摘要： A local oscillator communicates a signal of relatively low frequency across an integrated circuit to the location of a mixer. Near the mixer, a frequency-multiplying SubHarmonically Injection-Locked Oscillator (SHILO) receives the signal and generates therefrom a higher frequency signal. If the SHILO outputs I and Q quadrature signals, then the I and Q signals drive the mixer. If the SHILO does not generate quadrature signals, then a quadrature generating circuit receives the SHILO output signal and generates therefrom I and Q signals that drive the mixer. In one advantageous aspect, the frequency of the signal communicated over distance from the local oscillator to the SHILO is lower than the frequency of the I and Q signals that drive the mixer locally. Reducing the frequency of the signal communicated over distance can reduce power consumption of the LO signal distribution system by more than fifty percent as compared to conventional systems.

摘要翻译： 本地振荡器将跨越集成电路的相对较低频率的信号传送到混频器的位置。 在混频器附近，倍频次谐波注入锁定振荡器（SHILO）接收信号并从中产生较高频率的信号。 如果SHILO输出I和Q正交信号，则I和Q信号驱动混频器。 如果SHILO不产生正交信号，则正交发生电路接收SHILO输出信号并由其产生驱动混频器的I和Q信号。 在一个有利的方面，从本地振荡器到SHILO的距离传递的信号的频率低于驱动混频器的本地I和Q信号的频率。 与常规系统相比，降低信号传输距离的频率可以将LO信号分配系统的功耗降低50％以上。

公开(公告)号：US20160036382A1

公开(公告)日：2016-02-04

申请号：US14447478

申请日：2014-07-30

申请人： Texas Instruments Incorporated

发明人： Sudipto Chakraborty

IPC分类号： H03B5/12

CPC分类号： H03B5/1215 ,  H03B1/00 ,  H03B5/08 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/125 ,  H03B5/1262 ,  H03B5/1296 ,  H03B2200/0082 ,  H03B2201/0266

摘要： A wide tuning range oscillator system uses multiple active cores with cross-coupled transistors and multiple tapped inductors having windings that can be connected to circuit nodes. These active cores are connected to a pair of symmetric tapping points and are switched ON/OFF by biasing elements. Biasing schemes and the topology of the individual cross-coupled cores may be different from each other. The tapping points are symmetrically arranged around the center point of the inductor. One or more of the active cores may be enabled for tuning the center frequency of the oscillator system.

摘要翻译： 宽调谐范围振荡器系统使用具有交叉耦合晶体管的多个有源核心和具有可以连接到电路节点的绕组的多个抽头电感器。 这些活性芯连接到一对对称的攻丝点，并通过偏置元件接通/断开。 各个交叉耦合核心的偏置方案和拓扑可能彼此不同。 攻丝点围绕电感器的中心点对称排列。 可以使能一个或多个有源内核来调谐振荡器系统的中心频率。

公开(公告)号：US09035708B2

公开(公告)日：2015-05-19

申请号：US13916612

申请日：2013-06-13

申请人： International Business Machines Corporation

发明人： Pinping Sun

IPC分类号： H03B5/24 ,  H03B5/12

CPC分类号： H03B5/24 ,  H03B5/1212 ,  H03B5/1228 ,  H03B5/1243 ,  H03B2200/0082 ,  H03B2200/009

摘要： An enhanced negative resistance voltage controlled oscillator (VCO) circuit is provided, in which a parallel connection of a capacitor and a resistor configured to provide frequency-dependent transconductance is present across source nodes of a first pair of field effect transistors in which gate nodes and drain nodes are cross-coupled. The source nodes of the first pair of field effect transistors are electrically shorted to drain nodes of a second pair of field effect transistors of which the gate nodes are electrically shorted to the gate nodes of the first pair of field effect transistors. The parallel connection of the capacitor and the resistor includes a parallel connection of a capacitor and a resistor such that the net transconductance of the first pair of field effect transistors is less at low frequencies where thermal noise and flicker noise are dominant part of the phase noise than at the operational frequency range.

摘要翻译： 提供了一种增强的负电阻压控振荡器（VCO）电路，其中电容器和被配置为提供频率相关跨导的电阻器的并联连接存在于第一对场效应晶体管的源节点之间，其中栅极节点和 排水节点是交叉耦合的。 第一对场效应晶体管的源极节点与第二对场效应晶体管的漏极节点电短路，其栅极节点与第一对场效应晶体管的栅极节点电短路。 电容器和电阻器的并联连接包括电容器和电阻器的并联连接，使得第一对场效应晶体管的净跨导在低频处较小，其中热噪声和闪烁噪声是相位噪声的主要部分 比在工作频率范围。

公开(公告)号：US08525603B2

公开(公告)日：2013-09-03

申请号：US12890714

申请日：2010-09-27

申请人： Shuo-Chun Hung

发明人： Shuo-Chun Hung

IPC分类号： H03B5/36

CPC分类号： H03B5/36 ,  H03B2200/0046 ,  H03B2200/0082

摘要： An oscillating signal generating device includes an oscillating circuit and a control circuit. The oscillating circuit includes: a resonator having a first terminal and a second terminal for generating an oscillating signal, a resistive element having a first terminal coupled to the first terminal of the resonator, and a second terminal coupled to the second terminal of the resonator, and an oscillating start-up circuit having an input terminal coupled to the first terminal of the resonator and an output terminal coupled to the second terminal of the resonator. The control circuit generates a control signal to change the oscillating start-up circuit into a disable mode from an enable mode when the oscillating circuit generates an oscillating output signal under an operation mode, and outputs the oscillating signal generated by the resonator as the oscillating output signal of the oscillating circuit.

摘要翻译： 振荡信号发生装置包括振荡电路和控制电路。 振荡电路包括：谐振器，具有用于产生振荡信号的第一端子和第二端子，具有耦合到谐振器的第一端子的第一端子的电阻元件和耦合到谐振器的第二端子的第二端子， 以及振荡启动电路，其具有耦合到谐振器的第一端子的输入端子和耦合到谐振器的第二端子的输出端子。 当振荡电路在工作模式下产生振荡输出信号时，控制电路产生一个控制信号，以将振荡启动电路从使能模式转变为禁止模式，并将由谐振器产生的振荡信号作为振荡输出 振荡电路的信号。