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    Inductive modulator system
    1.
    发明授权
    Inductive modulator system 失效
    感应调制器系统

    公开(公告)号：US4902987A

    公开(公告)日：1990-02-20

    申请号：US341769

    申请日：1989-04-21

    申请人： Eugene A. Albright

    发明人： Eugene A. Albright

    IPC分类号： H03C1/10 ,  H03C1/60 ,  H03C3/18

    CPC分类号： H03C3/18 ,  H03C1/10 ,  H03C1/60

    摘要： A magnetic induction modulation and frequency multiplication system includes three toroidal coils physically mounted close to one another to provide magnetic flux coupling between them. One of the coils is supplied with a relatively high frequency carrier signal which has been shaped to eliminate one or the other of the positive or negative excursions thereof. A second coil is provided with an audio signal or other suitable input signal. The third coil constitutes the output coil and is utilized to provide signals to a transmitting circuit coupled to a transmitting antenna. The output signal from the third coil constitutes an amplitude modulated and phase/frequency modulated signal directly produced through the mutual inductive coupling of the three coils.

    Phase-locking circuit for swept synthesized source preferably having stability enhancement circuit
    6.
    发明授权
    Phase-locking circuit for swept synthesized source preferably having stability enhancement circuit 失效
    用于扫描合成源的锁相电路优选具有稳定性增强电路

    公开(公告)号：US5130670A

    公开(公告)日：1992-07-14

    申请号：US739592

    申请日：1991-08-01

    申请人： Stanley E. Jaffe

    发明人： Stanley E. Jaffe

    IPC分类号： H03B1/00 ,  H03B23/00 ,  H03C3/09 ,  H03C3/18 ,  H03J7/18 ,  H03L7/10 ,  H03L7/12 ,  H03L7/18 ,  H03L7/183 ,  H03L7/20

    CPC分类号： H03B23/00 ,  H03L7/12 ,  H03L7/183 ,  H03L7/20 ,  H03B2200/0092 ,  H03B2201/0241 ,  H03C3/0908 ,  H03C3/18

    摘要： A phase-lock loop for a swept synthesized source in which hysteresis, tuning nonlinearity, and drift over time and temperature of an oscillator incorporated into the swept synthesized source are compensated. The tuning current to the oscillator is initialized to zero to eliminate hysteresis effects. Then, the pretune current is set to produce the minimum operating frequency of the oscillator. Next, the main phase-lock loop is closed, and a low-frequency synthesizer is swept to in turn sweep the oscillator over a selected frequency span. If the selected frequency span extends over other frequency bands, the oscillator is swept to the maximum frequency of the present band and held at this frequency by a track and hold circuit. The main phase-lock loop is opened, the low-frequency synthesizer is re-initialized, the main phase-lock loop is again closed, and the low-frequency synthesizer is swept again. Each frequency band is crossed in a similar manner until the selected frequency span is swept. In order to improve phase-noise and transient response performance of the low-frequency synthesizer, a phase-lock loop speed-up and stability enhancement circuit comprising a zener diode connected across a passive lag-lead network is incorporated. Pretune calibration for the swept synthesized source is also provided.

    摘要翻译： 用于扫描合成源的锁相环，其中补偿了并入到扫描合成源中的振荡器的滞后，调谐非线性以及随时间和温度的漂移。 振荡器的调谐电流初始化为零以消除滞后效应。 然后，预调电流被设置为产生振荡器的最小工作频率。 接下来，主锁相环闭合，并且将低频合成器扫过，从而在选定的频率跨度上扫描振荡器。 如果所选择的频率跨度超过其他频带，则将振荡器扫描到当前频带的最大频率，并通过跟踪和保持电路保持在该频率。 主锁相环打开，低频合成器重新初始化，主相锁闭环再次闭合，低频合成器再次扫频。 每个频带以相似的方式交叉，直到选定的频率跨度被扫描为止。 为了提高低频合成器的相位噪声和瞬态响应性能，包括一个锁相环加速和稳定性增强电路，其包括连接在被动滞后引线网络上的齐纳二极管。 还提供了扫描合成源的预调整校准。