公开(公告)号：US07075378B2

公开(公告)日：2006-07-11

申请号：US10885118

申请日：2004-07-07

申请人： David A. Howe ,  Amitava Sen Gupta ,  Craig Nelson ,  Fred L. Walls

发明人： David A. Howe ,  Amitava Sen Gupta ,  Craig Nelson ,  Fred L. Walls

IPC分类号： H03B5/18

CPC分类号： H03B9/12 ,  H03B5/1817 ,  H03L7/00 ,  H03L7/081 ,  H03L7/099

摘要： A high spectral purity microwave oscillator is provided. The Oscillator uses an air-dielectric cavity and employs the known carrier-suppression technique. In one embodiment, the oscillator employs a high-Q cavity to self-sustain an oscillating signal formed by feeding back into its input a power-amplified output signal of the cavity in which residual phase noise in the amplifier stages is suppressed. A bandpass filter selects the cavity mode. FIG. 1 illustrates this embodiment. Another embodiment suppresses the noise of a voltage-controlled oscillator whose frequency and power-amplified output interrogates the cavity mode. FIG. 2 illustrates this embodiment.

摘要翻译： 提供高光谱纯度的微波振荡器。 振荡器使用空气介电腔并采用已知的载流子抑制技术。 在一个实施例中，振荡器采用高Q空腔来自我维持通过向其输入反馈形成的放大器级中的残余相位噪声被抑制的空腔的功率放大输出信号而形成的振荡信号。 带通滤波器选择腔模式。 图。 图1示出了该实施例。 另一个实施例抑制其频率和功率放大输出询问空腔模式的压控振荡器的噪声。 图。 图2示出了该实施例。

公开(公告)号：US4968908A

公开(公告)日：1990-11-06

申请号：US319197

申请日：1989-03-06

申请人： Fred L. Walls

发明人： Fred L. Walls

IPC分类号： G01R29/26 ,  H03C3/40

CPC分类号： G01R29/26 ,  H03C3/40

摘要： A phase modulator for use in a two-oscillator phase noise measurement system is placed in the line from either the reference oscillator or the device under test. The phase modulator couples a small portion of the input signal to an amplitude modulator and phase shifter to shift the small signal by exactly 90 degrees. The small signal portion is then coupled back into the input signal such that small variations in the coupled signal result in phase modulation and not amplitude modulation which would undermine the calibration of the instrument. The phase modulator described can also be used with known devices of many types to correct the added phase noise of components, e.g., power amplifiers.

摘要翻译： 用于双振荡器相位噪声测量系统的相位调制器被放置在来自参考振荡器或被测器件的线路中。 相位调制器将输入信号的一小部分耦合到幅度调制器和移相器，以将小信号精确地移动90度。 然后将小信号部分耦合回输入信号，使得耦合信号的小变化导致相位调制而不是幅度调制，这将破坏仪器的校准。 所描述的相位调制器也可以与许多类型的已知装置一起使用，以校正组件例如功率放大器的相加噪声。

公开(公告)号：US5172064A

公开(公告)日：1992-12-15

申请号：US801560

申请日：1991-12-02

申请人： Fred L. Walls

发明人： Fred L. Walls

IPC分类号： G01R35/00

CPC分类号： G01R35/005

摘要： An apparatus and a method for determining the error due to inherent PM andM noise in a noise measurement device. The apparatus is a calibration standard having a high frequency carrier source and a Gaussian noise source. The outputs of both sources are linearly combined by a power summer so that AM and PM noise components are equal at the output terminals of the calibration standard. To carry out the process of calibrating the calibration standard then determining inherent noise in a noise measuring device under test, the calibration standard includes means for switching to output a signal indicative of either the noise floor or a high frequency signal linearly combined with the output of a Gaussian noise source.

摘要翻译： 一种用于在噪声测量装置中确定由固有的PM和AM噪声引起的误差的装置和方法。 该装置是具有高频载波源和高斯噪声源的校准标准。 两个源的输出通过功率加法线性组合，使得AM和PM噪声分量在校准标准的输出端子相等。 为了执行校准校准标准的过程，然后确定被测噪声测量装置中的固有噪声，校准标准包括用于切换输出指示噪声基底或高频信号的信号的装置，该信号线性地与 高斯噪声源。

公开(公告)号：US5101506A

公开(公告)日：1992-03-31

申请号：US424454

申请日：1989-10-20

申请人： Fred L. Walls

发明人： Fred L. Walls

IPC分类号： G01R29/26 ,  H03C3/40

CPC分类号： H03C3/40 ,  G01R29/26

摘要： A phase modulator for use in a two-oscillator phase noise measurement sys is placed in the line from either the reference oscillator or the device under test. The phase modulator couples a small portion of the input signal to an amplitude modulator and phase shifter to shift the small signal by exactly 90 degrees. The small signal portion is then coupled back into the input signal such that small variations in the coupled signal result in phase modulation and not amplitude modulation which would undermine the calibration of the instrument. The phase modulator described can also be used with known devices of many types to correct the added phase noise of components, e.g., power amplifiers. The phase modulator, when used with a given fixed or variable frequency source, also forms a frequency calibration standard in a single portable instrument.

摘要翻译： 用于双振荡器相位噪声测量系统的相位调制器被放置在来自参考振荡器或被测器件的线路中。 相位调制器将输入信号的一小部分耦合到幅度调制器和移相器，以将小信号精确地移动90度。 然后将小信号部分耦合回输入信号，使得耦合信号的小变化导致相位调制而不是幅度调制，这将破坏仪器的校准。 所描述的相位调制器也可以与许多类型的已知装置一起使用，以校正组件例如功率放大器的相加噪声。 相位调制器在与给定的固定或可变频率源一起使用时，也可在单个便携式仪器中形成频率校准标准。

公开(公告)号：US4575690A

公开(公告)日：1986-03-11

申请号：US715862

申请日：1985-03-25

申请人： Fred L. Walls ,  John R. Vig

发明人： Fred L. Walls ,  John R. Vig

IPC分类号： H03B5/32 ,  H03L1/00

CPC分类号： H03L1/00 ,  H03B5/32 ,  H03B2200/0018

摘要： A crystal oscillator, including two crystals of unequal acceleration sensvity magnitude and mounted such that their respective acceleration sensitivity vectors are aligned in an anti-parallel relationship, further includes at least one electrical reactance, such as a variable capacitor, coupled to one of the crystals for providing cancellation of acceleration sensitivities. After the acceleration sensitivity vectors of the two crystals are aligned anti-parallel, the variable capacitor is adjusted until the net or resultant acceleration sensitivity vector of the pair of resonators is reduced to zero. A second electrical reactance, such as a variable capacitor, is utilized as a tuning capacitor for adjusting the oscillator's output frequency to the desired value, while maintaining the cancellation of acceleration sensitivities.

摘要翻译： 一种晶体振荡器，包括具有不等加速度灵敏度幅度的两个晶体并且被安装为使得它们各自的加速度灵敏度矢量以反并联关系对准，还包括耦合到晶体之一的至少一个电抗，例如可变电容器 用于提供加速度敏感性的取消。 在两个晶体的加速度灵敏度矢量反平行对准之后，调节可变电容器直到该对谐振器的净或合成的加速度灵敏度矢量被减小到零。 诸如可变电容器的第二电抗被用作调谐电容器，用于将振荡器的输出频率调整到期望值，同时保持加速度灵敏度的消除。