-
公开(公告)号：EP0760954A4
公开(公告)日：1999-11-10
申请号：EP95919278
申请日：1995-05-25
CPC分类号： H03B5/18 , G01R29/26 , G01R31/2824 , H03B2202/027 , H03B2202/076
摘要： A phase noise detector for a signal having a carrier frequency, comprising a frequency discriminator producing a dispersed signal from the signal and a phase detector means (28) responsive to the carrier frequency in the signal and to a carrier suppressed signal to produce an output signal corresponding to the noise close to the carrier frequency in the signal, the carrier suppressed signal being produced by a carrier suppression means (30) responsive to two input signals, the input signals corresponding to the signal, one of the input signals being the dispersed signal.
-
公开(公告)号：EP0902895A4
公开(公告)日：2000-08-16
申请号：EP97923665
申请日：1997-05-30
摘要： An interferometric signal processing apparatus (10) producing an output signal from a first input signal (34) and a second input signal (34), said input signals (34) having substantially equal carrier frequencies, comprising: a bridge (12) having a first arm (26) and a second arm (28), each arm having a first end (30) and a second end (32), the first and second input signals (34) being input to the first end (30) of the first and second arms (26, 28), respectively; a device-under-test (36) provided the first arm (26); a carrier suppression means (14) connected to the second ends (32) of the first and second arms (26, 28) to produce a carrier-suppressed signal at its output (A); an amplifier (16) arranged to amplify said carrier-suppressed signal; and a mixing means (22, 24) responsive to the amplified carrier-suppressed signal and a carrier-dominated signal to produce the output signal; wherein the differential group delay between: the first end (30) of the first arm (26) and the output (A) of the carrier suppression means (14); and the first end (30) of the second arm (28) and the output (A) of the carrier suppression means (14) is less than or equal to 1000/fo seconds, where fo is the time-averaged mean value of the carrier frequencies of the input signals (34).
-
公开(公告)号：EP1449272A4
公开(公告)日：2005-11-30
申请号：EP02771877
申请日：2002-10-30
CPC分类号： H03B5/1817 , H03B5/04 , H03B21/01
摘要： An oscillator having a desired output frequency, comprising a cavity resonator (102) loaded with an anisotropic dielectric material and an oscillator circuit (100) including the cavity resonator (102) as a frequency determining element, the oscillator circuit (100) arranged to operate the cavity resonator (102) at a first frequency in a first mode and at a second frequency in a second mode, the first mode and the second mode each being influenced to a different extent by the thermal coefficient of permittivity of at least one crystal axis of the dielectric material, the oscillator circuit arranged to produce the desired operating frequency from the first frequency and the second frequency. The first frequency and the second frequency differ by an amount corresponding to the desired output frequency.
-
公开(公告)号：EP0643874A4
公开(公告)日：1995-07-05
申请号：EP93912406
申请日：1993-06-01
发明人： IVANOV EUGENE NIKOLAY , BLAIR DAVID GERALD , TOBAR MICHAEL EDMUND , SEARLS JESSE HUYCK , EDWARDS SIMON JOHN
CPC分类号： H01P1/2084 , H01P7/10
摘要： A method of producing a microwave resonator comprising a cavity (50) defined, at least in part, by a generally cylindrical wall (64) having an electrically conductive inner surface and containing a generally cylindrical piece of low loss dielectric material (22), characterised by forming a generally cylindrical piece of low loss dielectric material of predetermined size and placing same in a cavity to produce a microwave resonator which operates in a particular mode at a specific frequency at a particular temperature. Microwave radiation corresponding to a further operating mode is then passed into the cavity and then the frequency corresponding to the further operating mode is searched for and measured. A further generally cylindrical piece of dielectric material is produced by scaling from the first piece of dielectric material according to the ratio between the first and second frequencies. Then, the diameter and/or height of the cavity is varied to compensate for manufacturing inaccuracies in the crystal so as to obtain an output frequency close to the desired output frequency.
摘要翻译： 一种制造微波谐振器的方法，该微波谐振器包括至少部分由具有导电内表面并包含大致圆柱形的低损耗电介质材料片（22）的大致圆柱形壁（64）限定的空腔（50），其特征在于， 通过形成预定尺寸的大致圆柱形的低损耗介电材料片并将其放置在空腔中以产生微波谐振器，该微波谐振器在特定温度下以特定频率以特定模式操作。 然后将对应于另一操作模式的微波辐射传送到空腔中，然后搜索并测量对应于另一操作模式的频率。 根据第一和第二频率之间的比率，通过从第一块介电材料上缩放来产生另一大体圆柱形的介电材料块。 然后，改变空腔的直径和/或高度以补偿晶体中的制造不精确性，以便获得接近所需输出频率的输出频率。
-
-
-
搜索结果
4 条记录 (耗时 0.012 秒)
