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1. 发明授权

US06424241B1 Fine tuning system for voltage controlled oscillators 有权
公开(公告)号：US06424241B1
公开(公告)日：2002-07-23
申请号：US09814679
申请日：2001-03-22
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： H03B518
摘要： A fine tuning system for adjusting the frequency of voltage controlled oscillators with fine resolution by mechanical tuning. A resonator is located on the dielectric substrate resonant frequency. The tuning system has metal strip located on a dielectric substrate. The metal strip has a pair of edges and a primary cut extending into the metal strip. The primary cut has a pair of ends. Several cavities in the metal strip are located adjacent an end of the primary cut. An elongated slot is cut into the metal strip. The slot is located between the cavities and an edge. The slot reduces the coupling of the tuning elements such as shorts, formed by cavities, to the resonator, and therefore allows fine tuning of the resonant frequency. Location of the slot closer to the cavities results in more fine tuning. Location of the slot further away from the cavities results in coarse tuning. An alternative embodiment is shown.

2. 发明授权

US06943629B2 Transient protection circuit of Darlington amplifier 有权
标题翻译：达林顿放大器瞬态保护电路
公开(公告)号：US06943629B2
公开(公告)日：2005-09-13
申请号：US10647186
申请日：2003-08-25
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： H03F1/52 , H02H7/20
CPC分类号： H03F1/52
摘要： A protection circuit for Darlington amplifiers prevents destructive voltage overshoot conditions from occurring. The Darlington amplifier has a pair of transistors connected in a Darlington configuration. A biasing network is coupled to the transistors for supplying a bias voltage to the transistors. A pair of de-coupling capacitors is coupled to the transistors. One of the de-coupling capacitors is coupled to the input of the Darlington amplifier and the other is coupled to the output. The output capacitor has a larger capacitance than the input capacitor such that excessive voltage is prevented from developing on the transistors.
摘要翻译：达林顿放大器的保护电路可防止出现破坏性电压过冲条件。达林顿放大器有一对以达林顿配置连接的晶体管。偏置网络耦合到晶体管，以向晶体管提供偏置电压。一对解耦电容器耦合到晶体管。解耦电容器之一耦合到达林顿放大器的输入端，另一个耦合到输出端。输出电容器具有比输入电容器更大的电容，使得防止在晶体管上产生过大的电压。

3. 发明授权

US06750741B2 Band pass filter 失效
标题翻译：带通滤波器
公开(公告)号：US06750741B2
公开(公告)日：2004-06-15
申请号：US10233964
申请日：2002-09-04
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： H01P120
CPC分类号： H01P1/20381
摘要： A band pass hairpin filter that has improved pass band performance and low loss. The filter has a dielectric substrate. The dielectric substrate has a top and bottom surface. A hairpin resonator is mounted to the top surface. The resonator has an open end and a closed end. An input coupling element is located adjacent to and is communicated with the resonator. An output coupling element is located adjacent to and is communicated with the resonator. A first inductive element is connected to the resonator. A second inductive element is connected to the input coupling element. A third inductive element is connected to the output coupling element.
摘要翻译：带通发夹滤波器，具有改善的通带性能和低损耗。该滤波器具有电介质基片。电介质基片具有顶表面和底表面。发夹谐振器安装到顶表面。谐振器具有开口端和封闭端。输入耦合元件位于与谐振器相邻并与谐振器连通的位置。输出耦合元件位于与谐振器相邻并与谐振器连通的位置。第一电感元件连接到谐振器。第二电感元件连接到输入耦合元件。第三感应元件连接到输出耦合元件。

4. 发明授权

US06549084B1 Low phase noise variable frequency oscillator 有权
公开(公告)号：US06549084B1
公开(公告)日：2003-04-15
申请号：US09576932
申请日：2000-05-24
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： H03B512
CPC分类号： H03B5/1847 , H03B2201/0208 , H03B2202/03
摘要： A variable frequency oscillator which exhibits low phase noise by increasing the quality factor of the resonator in the oscillator circuit. This is achieved by employing multiple means of decoupling the resonator from all elements and circuits to which the resonator is connected. For example, the resonator is decoupled from the whole oscillator circuitry by connecting the oscillator to a tap on the resonator which reflects the oscillator as a lighter load across the entire resonator. The resonator is further decoupled from the emitter to the base junction circuitry by placing a impedance network between the base of the transistor and the ground. Additional decoupling circuitry is employed to reduce the loading of the resonator due to the external oscillator load.

5. 发明授权

US07348854B1 Automatic biasing and protection circuit for field effect transistor (FET) devices 有权
标题翻译：用于场效应晶体管（FET）器件的自动偏置和保护电路
公开(公告)号：US07348854B1
公开(公告)日：2008-03-25
申请号：US11413810
申请日：2006-04-28
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： H02H7/20
CPC分类号： H03F1/301 , H03F1/523 , H03F3/193 , H03F2200/18
摘要： A transistor biasing circuit is shown that utilizes a negative feedback loop control circuit to set the gate bias voltage in the output transistors of a power amplifier. This control circuit has a current sensor in series with the drain of the transistor, the current sensor output in turn feeding a dc signal into a dc amplifier, and the output of the dc amplifier driving a gate bias integrator which forms a dc control loop for maintaining the bias point. The output transistor is protected from excessive temperature and/or excessive power dissipation.
摘要翻译：示出了晶体管偏置电路，其利用负反馈环路控制电路来设置功率放大器的输出晶体管中的栅极偏置电压。该控制电路具有与晶体管的漏极串联的电流传感器，电流传感器输出又将直流信号馈送到直流放大器，直流放大器的输出驱动栅极偏置积分器，其形成直流控制回路保持偏见。输出晶体管被保护免受过度的温度和/或过大的功耗。

6. 发明授权

US06911812B2 Method and apparatus for measuring frequency pulling in oscillators 失效
标题翻译：用于测量振荡器中的频率拉动的方法和装置
公开(公告)号：US06911812B2
公开(公告)日：2005-06-28
申请号：US10395934
申请日：2003-03-25
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： G01R31/28 , G01R23/16 , G01R31/08 , G01R35/00
CPC分类号： G01R31/2824
摘要： A test apparatus and method of measuring pulling of the frequency of an oscillator. The apparatus includes a bias tee, a power supply, a spectrum analyzer, a second power supply, a symmetrical resistive power splitter, a power meter and a synthesized signal generator. The method includes sweeping the synthesized signal generator frequency from the nominal frequency down to a first frequency. The first frequency is recorded when the oscillator goes out of frequency lock as a first pulling frequency. The synthesized signal generator frequency is then sweet from the nominal frequency up to a second frequency and the second pulling frequency is recorded when the oscillator goes out of frequency lock. The difference between the first and second pulling frequencies is the peak to peak pulling value.
摘要翻译：测量振荡器频率拉动的测试装置和方法。该装置包括偏置三通，电源，频谱分析仪，第二电源，对称电阻功率分配器，功率计和合成信号发生器。该方法包括将合成信号发生器频率从标称频率下降到第一频率。当振荡器作为第一个拉出频率离开频率锁定时，记录第一个频率。合成的信号发生器频率从标称频率到第二个频率很好，当振荡器超出频率锁定时，记录第二个拉频。第一和第二牵引频率之间的差异是峰值到峰值的拉动值。

7. 发明授权

US06479977B1 Automatic electronic load pull circuit for oscillators 有权
标题翻译：用于振荡器的自动电子负载拉电路
公开(公告)号：US06479977B1
公开(公告)日：2002-11-12
申请号：US09705298
申请日：2000-11-03
申请人： Mikhail Mordkovich
发明人： Mikhail Mordkovich
IPC分类号： G01R2316
CPC分类号： G01R31/2822 , G01R31/2824
摘要： A load pull circuit with a monitoring port which provides a constant VSWR throughout a phase variation in excess of 360°. The fundamental circuit comprises a fixed resistor of fifty ohms placed in series with an external fifty ohm load monitoring port resistor to ground. In parallel with the two series resistors, which total 100 ohms, is placed a 33.3 ohm resistor that is connected to ground through a series L-C circuit. The capacitance in the L-C circuit is adjustable and can be varied to cause the L-C circuit to change in net value from being inductive, to being resonant, and finally being capacitive. This causes the 33.3 ohm resistor to be connected to ground through an inductor, then through a short, and finally through a capacitor, making the load pull circuit present a load that vary through 360 degree in phase, while still remaining at a VSWR of 2:1. The inductor in the L-C circuit is a varactor, making the sweep through all 360° totally electronically controllable and simple to automate. This invention reduces the measurement time from typically 5 minutes to less than one second.
摘要翻译：具有监控端口的负载拉电路，其在超过360°的相位变化中提供恒定的VSWR。基本电路包括一个50欧姆的固定电阻器，与一个外部的50欧姆负载监控端口电阻串联放置。与总共100欧姆的两个串联电阻并联，放置一个33.3欧姆电阻，通过一个L-C电路与地相连。 L-C电路中的电容是可调节的，可以改变，使得L-C电路的净值从电感变为谐振，最后变为电容。这使得33.3欧姆电阻器通过电感器接地，然后通过短路，最后通过电容器，使负载拉电路呈现出相位相差360度的负载，同时仍保持在2W的VSWR ：1。 L-C电路中的电感器是一个变容二极管，使得扫描全部360°全电子可控并且易于自动化。本发明将测量时间从典型的5分钟缩短到小于1秒。

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