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    Frequency Modulator and Magnetic Resonance Tomography System with a Frequency Modulator
    31.
    发明申请
    Frequency Modulator and Magnetic Resonance Tomography System with a Frequency Modulator 有权
    具有频率调制器的频率调制器和磁共振层析成像系统

    公开(公告)号：US20140009237A1

    公开(公告)日：2014-01-09

    申请号：US13934183

    申请日：2013-07-02

    Applicant: Ralph Oppelt

    Inventor： Ralph Oppelt

    IPC: H03C3/00

    CPC classification number: H03C3/00 ,  G01R33/36 ,  H03B2200/004 ,  H03B2201/011 ,  H03B2201/0208 ,  H03C3/22 ,  H03L7/099

    Abstract: A frequency modulator includes a first pair of diodes with two capacity diodes, and a second pair of diodes with two additional capacity diodes. The second pair of diodes is employed in parallel. The frequency modulator also includes a first modulator input for reception of a first modulation signal and a second modulator input for reception of a symmetrical second modulation signal. Both pairs of diodes are coupled to an oscillator unit.

    Abstract translation: 频率调制器包括具有两个容量二极管的第一对二极管和具有两个附加容量二极管的第二对二极管。 第二对二极管并联使用。 频率调制器还包括用于接收第一调制信号的第一调制器输入和用于接收对称的第二调制信号的第二调制器输入。 两对二极管耦合到振荡器单元。

    Dual port oscillator for two-stage direct conversion receiver
    33.
    发明授权
    Dual port oscillator for two-stage direct conversion receiver 失效
    双端口振荡器，用于两级直接转换接收器

    公开(公告)号：US5263197A

    公开(公告)日：1993-11-16

    申请号：US762759

    申请日：1991-09-20

    Applicant: Yoshiharu Manjo ,  Charles R. McMurray ,  Tadashi Ohga

    Inventor： Yoshiharu Manjo ,  Charles R. McMurray ,  Tadashi Ohga

    IPC: H03B1/00 ,  H03B5/36 ,  H03B19/14 ,  H03B25/00 ,  H03D7/16 ,  H03J5/02 ,  H04B1/28 ,  H04B1/30 ,  H04B1/26

    CPC classification number: H03J5/0272 ,  H03B25/00 ,  H04B1/28 ,  H04B1/30 ,  H03B19/14 ,  H03B2201/011 ,  H03B2201/0208 ,  H03B5/362 ,  H03D7/16

    Abstract: A two-stage direct conversion receiver. A first mixer (13) converts the incoming signal to an intermediate frequency (IF) signal. A second mixer (16) converts the IF signal to a baseband signal. A detector (17), receiver logic circuit (18), and alerting device circuit (19) act upon the baseband output signal. A two port oscillator (14) provides a fundamental frequency output (FO) and a tripled output frequency (3 FO). The tripled output frequency is again tripled (9 FO) by a frequency multiplier (15) and is provided as a mixing signal to the first mixer (13). The fundamental frequency output is provided to a phase locked loop (20, 21, 22). The output frequency (FV) of the phase locked loop is doubled (2 FV) by a frequency multiplier (23) and provided to a phase shift circuit (24). The output of the phase shift circuit (24) is provided as the second mixing signal to the second mixer (16). The phase locked loop comprises a phase locked loop controller (20), a phase locked loop filter (21), and a voltage controlled oscillator (22). The main oscillator (14) is configured as a crystal controlled Colpitts oscillator, which has an emitter resonant circuit selected to produce oscillation at the fundamental frequency, and a collector resonant circuit selected to extract the third harmonic of the fundamental oscillation frequency. A single active device can therefore provide both the fundamental frequency and the third harmonic frequency. Calibration of the receiver is effected by simply tuning the oscillator (14) to produce a baseband output signal at the output of the second mixer (16). Single step calibration is therefore effected because the voltage controlled oscillator (22) is locked to the main oscillator (14).

    Abstract translation: 两级直接转换接收机。 第一混频器（13）将输入信号转换成中频（IF）信号。 第二混频器（16）将IF信号转换为基带信号。 检测器（17），接收器逻辑电路（18）和报警装置电路（19）作用于基带输出信号。 双端口振荡器（14）提供基频输出（FO）和三倍输出频率（3 FO）。 倍增输出频率由倍频器（15）再三倍（9F），并作为混合信号提供给第一混频器（13）。 基频输出被提供给锁相环（20,21,22）。 锁相环的输出频率（FV）由倍频器（23）加倍（2 FV），并提供给相移电路（24）。 将相移电路（24）的输出作为第二混频信号提供给第二混频器（16）。 锁相环包括锁相环控制器（20），锁相环滤波器（21）和压控振荡器（22）。 主振荡器（14）被配置为晶体控制的Colpitts振荡器，其具有选择用于产生基频振荡的发射极谐振电路和选择为提取基波振荡频率的三次谐波的集电极谐振电路。 因此，单个有源器件可以提供基频和三次谐波频率。 通过简单地调谐振荡器（14）来在第二混频器（16）的输出处产生基带输出信号来实现接收机的校准。 因此，单步校准是因为压控振荡器（22）被锁定到主振荡器（14）。

    Transistor microstrip oscillator and diode attenuator modulator
    35.
    发明授权
    Transistor microstrip oscillator and diode attenuator modulator 失效
    晶体管微带振荡器和二极管衰减器调制器

    公开(公告)号：US4140982A

    公开(公告)日：1979-02-20

    申请号：US885711

    申请日：1978-03-13

    Applicant: Wilson E. Alexander

    Inventor： Wilson E. Alexander

    IPC: H03B1/00 ,  H03B5/18 ,  H03C1/14

    CPC classification number: H03B5/1847 ,  H03C1/14 ,  H03B2200/0008 ,  H03B2201/011

    Abstract: An RF oscillator and modulator especially useful for UHF applications. The oscillator may comprise a series-tuned Colpitts circuit with the tuned circuit including microstrip transmission lines as impedance elements. The modulator includes a pair of serially connected diodes with the common terminal of the diodes receiving a modulation signal which varies the total current through the diodes. The diodes function as current-variable resistances to attenuate the carrier frequency signal in response to the modulation signal.

    Abstract translation: RF振荡器和调制器特别适用于UHF应用。 振荡器可以包括串联调谐的Colpitts电路，其中调谐电路包括作为阻抗元件的微带传输线。 调制器包括一对串联连接的二极管，二极管的公共端接收调制信号，该调制信号改变通过二极管的总电流。 二极管作为电流可变电阻起到响应于调制信号衰减载波频率信号的作用。

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