公开(公告)号：US3965438A

公开(公告)日：1976-06-22

申请号：US518663

申请日：1974-10-29

申请人： Fendall Gregory Winston, IV

发明人： Fendall Gregory Winston, IV

IPC分类号： H03L7/16 ,  G01R23/173 ,  H03B23/00 ,  H03C3/09 ,  H03L7/18 ,  H03B3/10

CPC分类号： H03C3/0991 ,  H03B23/00 ,  H03C3/095

摘要： A system for automatically maintaining the center frequency of a swept voltage controlled oscillator. At a known amplitude of sweep voltage input, a lock pulse is actuated. The oscillator output is divided by a number N and applied simultaneously with the reference signal to a phase and/or frequency detector. The detected signal is applied via a gate under the control of such lock pulse to a memorization unit whose output is used to maintain the center frequency.

摘要翻译： 用于自动维持扫频压控振荡器的中心频率的系统。 在已知的扫描电压输入幅度下，启动锁定脉冲。 振荡器输出除以数字N，并与参考信号同时施加到相位和/或频率检测器。 在这种锁定脉冲的控制下，检测到的信号经由门被施加到其输出用于维持中心频率的存储单元。

公开(公告)号：US3512108A

公开(公告)日：1970-05-12

申请号：US3512108D

申请日：1965-01-13

申请人： WESTINGHOUSE ELECTRIC CORP

发明人： WORRELL EDSEL A

IPC分类号： G01R29/06 ,  H03B23/00 ,  H03B3/10 ,  H03C3/08 ,  H03K1/16

CPC分类号： H03B23/00 ,  G01R29/06

公开(公告)号：US3748590A

公开(公告)日：1973-07-24

申请号：US3748590D

申请日：1972-04-14

申请人： SINGER CO

发明人： GRAY J

IPC分类号： G01R23/02 ,  G01R23/173 ,  G01S1/54 ,  G01S1/60 ,  G01S13/50 ,  H03L7/02 ,  H03L7/06 ,  H03L7/087 ,  H03B3/10

CPC分类号： H03L7/087

摘要： A frequency tracker in which the input frequency to be tracked is first heterodyned by a pair of signals, in phase quadrature, at a first reference frequency thereby producing a pair of filtered signals, in phase quadrature, proportional to the difference in frequency between the input and reference frequency. The time derivative is taken of each of these filtered signals. The outputs of each of the differentiators are multiplied together with the filtered output of the opposite channel, with the multiplied outputs combined to form a signal proportional to the input power and the difference in frequency between the input and reference frequency. The combined outputs are integrated to provide an error signal, proportional to the frequency difference, which is periodically applied to the reference frequency oscillator to adjust its frequency so that it is more closely aligned with the input frequency.

摘要翻译： 要跟踪的输入频率首先以相位正交的第一参考频率的一对信号外差的频率跟踪器，从而产生与输入之间的频率差成比例的相位正交的一对滤波信号 和参考频率。 对这些滤波信号中的每一个采取时间导数。 每个微分器的输出与相反通道的滤波输出相乘，其中相乘的输出被组合以形成与输入功率成正比的信号和输入和参考频率之间的频率差。 组合的输出被集成以提供与频率差成比例的误差信号，其周期性地施加到参考频率振荡器以调整其频率，使得其与输入频率更紧密地对准。

公开(公告)号：US3449690A

公开(公告)日：1969-06-10

申请号：US3449690D

申请日：1967-07-26

申请人： CIT ALCATEL

发明人： BERMAN LEON

IPC分类号： H03L7/20 ,  H03B3/10 ,  H03B3/08 ,  H03B21/02

CPC分类号： H03L7/20

公开(公告)号：US4006429A

公开(公告)日：1977-02-01

申请号：US617143

申请日：1975-09-26

申请人： Daniel B. Talbot

发明人： Daniel B. Talbot

IPC分类号： H03C3/09 ,  H03B3/10 ,  H03C3/00

CPC分类号： H03C3/09

摘要： Homodyne automatic frequency control circuitry maintains the mean or center output frequency of a controlled oscillator, e.g., the output of a voltage controlled oscillator effecting frequency modulation, equal to the output frequency of a reference oscillator. The composite AFC circuitry employs ganged sampling switches and a common mode error obviating common frequency detector (e.g., a discriminator) to alternately store voltages representative of the reference and controlled oscillator frequencies in capacitors connected to the inputs of a difference amplifier. The difference amplifier acts through an integrator to supply any necessary correction potential to the control port of the controlled oscillator when the signals stored in the two capacitors differ, signalling that the mean output frequency of the controlled oscillator has departed from that of the reference oscillator.

摘要翻译： 零差自动频率控制电路维持受控振荡器的平均或中心输出频率，例如，影响频率调制的压控振荡器的输出等于参考振荡器的输出频率。 复合AFC电路采用组合采样开关和共模误差，消除公共频率检测器（例如，鉴频器），以将表示参考和受控振荡器频率的电压交替存储在连接到差分放大器的输入端的电容器中。 差分放大器通过积分器起作用，当存储在两个电容器中的信号不同时，可以向受控振荡器的控制端口提供任何必要的校正电位，表明受控振荡器的平均输出频率偏离了参考振荡器的平均输出频率。

公开(公告)号：US3854103A

公开(公告)日：1974-12-10

申请号：US41323073

申请日：1973-11-06

申请人： TAKARADA E

发明人： TAKARADA E

IPC分类号： H03K3/03 ,  H03K3/72 ,  H03B3/10 ,  H03K5/04

CPC分类号： H03K3/72 ,  H03K3/03

摘要： A pulse generator for use in an EDM power supply or the like wherein the pulse-on time and pulse-off time are each adjustable, substantially independently of the other. The circuit contains a pair of relaxation oscillators, one of which is associated with the on-time and one with the off-time of the output pulse train. The timed signals produced by the oscillators are shaped by respective Schmidt triggers for controlling a flip-flop which thereby generates the output pulse train. The flip-flop outputs are fed back to the oscillator inputs so as to allow only one of such oscillators to be active at any given time thereby allowing the on-period and off-period to be each independently timed.

摘要翻译： 用于EDM电源等的脉冲发生器，其中脉冲开启时间和脉冲关闭时间各自可调节，基本上独立于另一个。 该电路包含一对弛豫振荡器，其中之一与导通时间相关联，一个与输出脉冲串的关闭时间相关。 由振荡器产生的定时信号由相应的施密特触发器形成，用于控制触发器，从而产生输出脉冲串。 触发器输出被反馈到振荡器输入，以便允许这些振荡器中的仅一个在任何给定时间处于活动状态，从而允许导通周期和截止周期各自独立定时。

公开(公告)号：US3789316A

公开(公告)日：1974-01-29

申请号：US3789316D

申请日：1973-06-13

申请人： SINGER CO

发明人： GOETZ P ,  SOLOMON L

IPC分类号： H03L7/087 ,  H03B3/10

CPC分类号： H03L7/087

摘要： A sine-cosine frequency tracking system is provided for tracking the center of power of a Doppler type input signal. The system of the invention includes a discriminator connected in an error feedback loop, and which develops an error signal whenever the center frequency of the input signal differs from the frequency of a pair of sine-cosine keying signals. The aforesaid discriminator incorporates solid state integrated circuitry, and it is constructed to eliminate the need for difficult trim adjustments which are necessary in the prior art systems. The aforesaid discriminator also serves to improve the accuracy of the system by removing error sources present in the prior art systems.

摘要翻译： 提供了一个正弦余弦频率跟踪系统，用于跟踪多普勒型输入信号的功率中心。 本发明的系统包括连接在误差反馈回路中的鉴频器，并且每当输入信号的中心频率与一对正弦余弦键控信号的频率不同时产生误差信号。 上述鉴别器集成了固态集成电路，并且其被构造为消除了对现有技术系统中必需的难修整调整的需要。 上述鉴别器还用于通过消除现有技术系统中存在的误差源来提高系统的精度。