Capless Regulator Overshoot and Undershoot Regulation Circuit
    1.
    发明申请
    Capless Regulator Overshoot and Undershoot Regulation Circuit 有权
    无功调节器过冲和欠压调节电路

    公开(公告)号:US20120086420A1

    公开(公告)日:2012-04-12

    申请号:US12901868

    申请日:2010-10-11

    IPC分类号: G05F1/00

    CPC分类号: G05F1/575

    摘要: Systems and methods for reducing voltage undershoot and overshoot of a voltage regulator are disclosed. In one embodiment of the present disclosure, an undershoot/overshoot regulation circuit comprises a control node having a control voltage. The regulation circuit also comprises a control circuit configured to increase the control voltage in response to a load being applied to an output node of a voltage regulator and decrease the control voltage in response to the load being removed from the output node. The regulation circuit also comprises a control capacitor including a first terminal coupled to the control node and a second terminal coupled to a gate node of the voltage regulator. The control capacitor is configured to increase a gate voltage at the gate node in response to the increase of the control voltage, and decrease the gate voltage in response to the decrease of the control voltage.

    摘要翻译: 公开了用于减小电压调节器的电压下冲和过冲的系统和方法。 在本公开的一个实施例中,下冲/超调调节电路包括具有控制电压的控制节点。 调节电路还包括控制电路,其被配置为响应于施加到电压调节器的输出节点的负载而增加控制电压,并且响应于从输出节点移除负载而减小控制电压。 调节电路还包括控制电容器,其包括耦合到控制节点的第一端子和耦合到电压调节器的栅极节点的第二端子。 控制电容器被配置为响应于控制电压的增加而增加栅极节点处的栅极电压,并且响应于控制电压的降低而降低栅极电压。

    Radio receiver and method of calibrating same
    2.
    发明授权
    Radio receiver and method of calibrating same 失效
    无线电接收机及其校准方法

    公开(公告)号:US5701600A

    公开(公告)日:1997-12-23

    申请号:US502997

    申请日:1995-07-17

    IPC分类号: H03J1/00 H04B1/16

    CPC分类号: H03J1/0008 H03J2200/28

    摘要: A method of calibrating a radio receiver (100) which has a desired IF center frequency (fo) includes generating and applying to the receiver's demodulator (126) a plurality of reference signals. The demodulated reference signals are used to generate, for the demodulator, a transfer function that is predictive of amplitude versus frequency characteristics of signals to be demodulated by the demodulator (126). The transfer function (202) is used to determine a frequency offset between a received signal's intermediate frequency and the desired frequency fo. The determined frequency offset is used to adjust the IF frequency of the received signal towards the desired frequency fo. The adjustment process preferably continues until the frequency offset is below a desired threshold. A receiver using the disclosed method is also described.

    摘要翻译: 校准具有期望的IF中心频率(fo)的无线电接收机(100)的方法包括生成并向接收机的解调器(126)应用多个参考信号。 解调的参考信号用于为解调器产生预测由解调器(126)解调的信号的幅度 - 频率特性的传递函数。 传递函数(202)用于确定接收信号的中间频率和期望频率fo之间的频率偏移。 所确定的频率偏移用于将接收到的信号的IF频率调整到期望的频率fo。 调整过程优选地继续直到频率偏移低于期望的阈值。 还描述了使用所公开的方法的接收机。

    Capless regulator overshoot and undershoot regulation circuit
    3.
    发明授权
    Capless regulator overshoot and undershoot regulation circuit 有权
    无电压调节器过冲和下冲调节电路

    公开(公告)号:US08436595B2

    公开(公告)日:2013-05-07

    申请号:US12901868

    申请日:2010-10-11

    IPC分类号: G05F1/565

    CPC分类号: G05F1/575

    摘要: Systems and methods for reducing voltage undershoot and overshoot of a voltage regulator are disclosed. In one embodiment of the present disclosure, an undershoot/overshoot regulation circuit comprises a control node having a control voltage. The regulation circuit also comprises a control circuit configured to increase the control voltage in response to a load being applied to an output node of a voltage regulator and decrease the control voltage in response to the load being removed from the output node. The regulation circuit also comprises a control capacitor including a first terminal coupled to the control node and a second terminal coupled to a gate node of the voltage regulator. The control capacitor is configured to increase a gate voltage at the gate node in response to the increase of the control voltage, and decrease the gate voltage in response to the decrease of the control voltage.

    摘要翻译: 公开了用于减小电压调节器的电压下冲和过冲的系统和方法。 在本公开的一个实施例中,下冲/超调调节电路包括具有控制电压的控制节点。 调节电路还包括控制电路,其被配置为响应于施加到电压调节器的输出节点的负载而增加控制电压,并且响应于从输出节点移除负载而减小控制电压。 调节电路还包括控制电容器,其包括耦合到控制节点的第一端子和耦合到电压调节器的栅极节点的第二端子。 控制电容器被配置为响应于控制电压的增加而增加栅极节点处的栅极电压,并且响应于控制电压的降低而降低栅极电压。

    System and Method For Supporting Different Types of Oscillator Circuits
    4.
    发明申请
    System and Method For Supporting Different Types of Oscillator Circuits 有权
    支持不同类型振荡器电路的系统和方法

    公开(公告)号:US20120280842A1

    公开(公告)日:2012-11-08

    申请号:US13100656

    申请日:2011-05-04

    IPC分类号: H03M1/00 H03L7/00

    摘要: In accordance with some embodiments of the present disclosure, an oscillator circuit comprises, a first pad associated with a first terminal of an oscillator and a second pad associated with a second terminal of the oscillator. The oscillator is configured to generate an oscillating signal and communicate the oscillating signal from the second terminal to a clock distributor coupled to the second pad. The oscillator circuit further comprises an oscillator gain element comprising an output node coupled to the first pad and an input node coupled to the second pad. The oscillator circuit also comprises a digital-to-analog converter (DAC) coupled to the first pad. The oscillator circuit additionally comprises a switching circuit coupled to the gain element. The switching circuit is configured to enable the gain element when the oscillator comprises a resonator and disable the gain element when the oscillator comprises a voltage controlled oscillating module.

    摘要翻译: 根据本公开的一些实施例,振荡器电路包括:与振荡器的第一端子相关联的第一焊盘和与振荡器的第二端子相关联的第二焊盘。 振荡器被配置为产生振荡信号并将振荡信号从第二终端传送到耦合到第二焊盘的时钟分配器。 振荡器电路还包括振荡器增益元件,其包括耦合到第一焊盘的输出节点和耦合到第二焊盘的输入节点。 振荡器电路还包括耦合到第一焊盘的数模转换器(DAC)。 振荡器电路还包括耦合到增益元件的开关电路。 开关电路被配置为当振荡器包括谐振器时启用增益元件,并且当振荡器包括电压控制的振荡模块时禁用增益元件。

    System and Method for Reducing Temperature-and Process-Dependent Frequency Variation of a Crystal Oscillator Circuit
    5.
    发明申请
    System and Method for Reducing Temperature-and Process-Dependent Frequency Variation of a Crystal Oscillator Circuit 审中-公开
    降低晶体振荡电路的温度和工艺相关频率变化的系统和方法

    公开(公告)号:US20120206209A1

    公开(公告)日:2012-08-16

    申请号:US13026425

    申请日:2011-02-14

    IPC分类号: H03L1/02

    CPC分类号: H03L1/026

    摘要: An oscillator may include a crystal resonator, an active element coupled in parallel with the crystal resonator and configured to produce at its output a waveform with an approximate 180-degree phase shift from its input, a voltage regulator a voltage regulator coupled to the active element, a sum of thresholds circuit coupled to the input of the voltage regulator, and a temperature-dependent current source coupled to the input of the voltage regulator. The voltage regulator may be configured to supply a supply voltage to the active element, the supply voltage a function of a reference voltage received at an input of the voltage regulator. The sum of thresholds circuit may be configured to generate the reference voltage such that the reference voltage is process-dependent. The temperature-dependent current source may be configured to generate a temperature-dependent current such that the reference voltage is temperature-dependent.

    摘要翻译: 振荡器可以包括晶体谐振器,与晶体谐振器并联耦合的有源元件,并且被配置为在其输出端产生其输入端具有大约180度相移的波形,电压调节器,耦合到有源元件的电压调节器 ,耦合到电压调节器的输入的阈值电路的总和以及耦合到电压调节器的输入的与温度相关的电流源。 电压调节器可以被配置为向有源元件提供电源电压,电源电压是在电压调节器的输入处接收的参考电压的函数。 阈值电路的总和可以被配置为产生参考电压,使得参考电压是依赖于过程的。 温度依赖性电流源可以被配置为产生温度依赖电流,使得参考电压是温度依赖性的。

    Method and apparatus for optimizing an oscillator start up time
    6.
    发明授权
    Method and apparatus for optimizing an oscillator start up time 失效
    振荡器启动时间优化的方法和装置

    公开(公告)号:US5844448A

    公开(公告)日:1998-12-01

    申请号:US928162

    申请日:1997-09-12

    摘要: An oscillator circuit (10) having an optimized start up time includes an inverting amplifier (12) coupled in parallel to a crystal (14), a first bank of capacitors (16) coupled to the crystal, and a second bank of capacitors (20) switchably coupled (18) in parallel to the frequency resonant network, wherein the second bank of capacitors has a higher capacitance load than the first bank of capacitors. The oscillator circuit may also include a processor (62) for controlling when the second bank of capacitors gets switched and coupled to the crystal.

    摘要翻译: 具有优化的启动时间的振荡器电路(10)包括与晶体(14)并联耦合的反相放大器(12),耦合到晶体的第一组电容器(16)和第二组电容器(20) )与所述频率共振网络并联地切换耦合(18),其中所述第二组电容器具有比所述第一组电容器更高的电容负载。 振荡器电路还可以包括用于控制何时第二组电容器被切换并耦合到晶体的处理器(62)。