公开(公告)号：US4359694A

公开(公告)日：1982-11-16

申请号：US156858

申请日：1980-06-04

Applicant: Kazuyuki Suenaga

Inventor： Kazuyuki Suenaga

IPC: H03D3/00 ,  H03D3/26

CPC classification number: H03D3/26

Abstract: An FM signal demodulating circuit comprises a peak differential type amplifier having two input terminals, a resonance circuit network connected between the two input terminals of the peak differential type amplifier, and a capacitor between the resonance circuit network and the ground. The resonance circuit network comprises a plurality of parallel resonance circuits which are connected in series and have respectively different parallel resonance frequencies. The demodulating circuit has a demodulating characteristic curve for demodulating FM signals having different carrier frequencies.

Abstract translation: FM信号解调电路包括具有两个输入端的峰值差分放大器，连接在峰值差分放大器的两个输入端之间的谐振电路网络和谐振电路网络与地之间的电容器。 谐振电路网络包括串联连接并具有分别不同的并联谐振频率的多个并联谐振电路。 解调电路具有用于解调具有不同载波频率的FM信号的解调特性曲线。

公开(公告)号：US4272726A

公开(公告)日：1981-06-09

申请号：US59469

申请日：1979-07-20

Applicant: Max E. Malchow

Inventor： Max E. Malchow

IPC: H03D3/14 ,  H03D3/26

CPC classification number: H03D3/26 ,  H03D3/14

Abstract: A balanced discriminator for frequency modulation systems particularly useful in integrated circuit applications. A source of FM signal having substantially zero source impedance drives a discriminator circuit-differential peak detector combination. The discriminator comprises first and second like capacitors connected between the FM source and first and second input connections to the differential peak detector respectively, an inductor connected between the input connections of the differential peak detector, and a third capacitor connected between said second input connection and a point of fixed potential.

Abstract translation: 用于频率调制系统的平衡鉴频器，在集成电路应用中特别有用。 具有基本上零源阻抗的FM信号源驱动鉴别器电路 - 差分峰值检测器组合。 鉴频器包括分别连接在FM源和分别与差分峰值检测器的第一和第二输入连接点之间的第一和第二类似电容器，连接在差分峰值检测器的输入连接之间的电感器和连接在所述第二输入连接和 一个固定的潜力点。

公开(公告)号：US4207597A

公开(公告)日：1980-06-10

申请号：US95551678

申请日：1978-10-30

Applicant: RCA CORP

Inventor： GIBSON WALTER G ,  LIU FRANK C

IPC: H03J7/02 ,  H03D3/26 ,  H03J7/04 ,  H03L7/02 ,  H04N5/50

CPC classification number: H03J7/04 ,  H03D3/26 ,  H03L7/02

Abstract: An automatic fine tuning (AFT) circuit is provided which generates an AFT control signal in response to a video intermedate frequency (I.F.) signal. The I.F. signal is supplied to the input of a current source amplifier, which provides current signals of like phase relationship to a discriminator network. The discriminator network is comprised of two tuned circuits, one of which is resonant at a frequency below the desired frequency of the I.F. picture carrier, and the other resonant at a frequency above the desired frequency. The tuned circuits develop voltage variations which vary differentially in magnitude in response to the frequency deviation of the I.F. picture carrier from its desired frequency. The differentially related voltages are detected by two peak detector networks for use as AFT control signals. The current source amplifier and peak detector networks may be conveniently fabricated on a single I.C. chip. The tuned circuits are coupled to the current source amplifier and peak detector networks through two external I.C. terminals.

Abstract translation: 提供了一种自动微调（AFT）电路，其响应于视频中间频率（I.F.）信号产生AFT控制信号。 I.F. 信号被提供给电流源放大器的输入，电流源放大器向鉴别器网络提供类似相位关系的电流信号。 鉴别器网络由两个调谐电路组成，其中一个调谐电路以低于I.F的期望频率的频率谐振。 图像载体，另一个以高于期望频率的频率谐振。 调谐电路产生响应于I.F.的频率偏差而在幅度上差异变化的电压变化。 图片载体从其所需的频率。 差分相关电压由两个峰值检测器网络检测，用作AFT控制信号。 电流源放大器和峰值检测器网络可以方便地在单个I C上制造。 芯片。 调谐电路通过两个外部I C耦合到电流源放大器和峰值检测器网络。 终端。

公开(公告)号：US4087757A

公开(公告)日：1978-05-02

申请号：US755719

申请日：1976-12-30

Applicant: Vernon R. Cunningham

Inventor： Vernon R. Cunningham

IPC: H03D3/26

CPC classification number: H03D3/26

Abstract: The method of designing a circuit having a substantially constant delay over a given frequency band and having a substantially linear attenuation characteristic or amplitude change characteristic over the same frequency band and the product resulting from such a design approach. One such approach uses a primary tank circuit having a given Q and amplitude response feeding two secondary tank circuits each of which have a higher Q and amplitude response and wherein the resonant points are on either side of the resonant point of the primary tank. By adjusting the Q, amplitude response and resonant frequency of the three tanks, the "delayless" and linear amplitude change characteristics over a given frequency band can be achieved.

Abstract translation: 设计在给定频带上具有基本上恒定的延迟并且在相同频带上具有基本线性的衰减特性或幅度变化特性的电路的方法以及由这种设计方法产生的乘积。 一种这样的方法使用具有给定的Q和振幅响应的主振荡电路，馈送两个二级电路，每个二级电路具有较高的Q和振幅响应，并且其中谐振点在主级谐振点的任一侧。 通过调整三个坦克的Q，振幅响应和谐振频率，可以实现给定频带上的“无延迟”和线性振幅变化特性。

公开(公告)号：US4066972A

公开(公告)日：1978-01-03

申请号：US712707

申请日：1976-08-09

Applicant: Yukinobu Ishigaki ,  Kohei Sasamura

Inventor： Yukinobu Ishigaki ,  Kohei Sasamura

IPC: G11B3/00 ,  H03D3/00 ,  H03D3/02 ,  H03D3/06 ,  H03D3/24 ,  H03D3/26 ,  H04H20/89 ,  H04S3/00 ,  H03D3/22

CPC classification number: H04H20/88 ,  H03D3/005 ,  H03D3/02 ,  H03D3/06 ,  H03D3/24 ,  H03D3/26 ,  H04H20/89

Abstract: The inventive system demodulates angle-modulated signals. A tracking band-pass filter responds to an input angle-modulated wave signal. The tracking filter has a pass band with a center frequency controlled by a control signal. A first amplitude limiter limits the amplitude of the input angle-modulated wave signal. A differentiation circuit establishes a 90.degree. phase difference between a signal passing through the tracking band-pass filter and a signal passing through the amplitude limiter. A phase comparator responds to an input with the two signals with a 90.degree. phase difference therebetween and produces an output error signal in accordance with this phase difference. This output error signal is supplied as the control signal to the tracking band-pass filter. This output error signal is also passed through a low pass filter to obtain the demodulated signal.

Abstract translation: 本发明的系统解调角度调制信号。 跟踪带通滤波器响应输入角度调制波信号。 跟踪滤波器具有通过控制信号控制的中心频率的通带。 第一幅度限制器限制输入角度调制波信号的幅度。 差分电路在通过跟踪带通滤波器的信号和通过幅度限制器的信号之间建立90°的相位差。 相位比较器响应输入，其中两个信号之间的相位差为90°，并根据该相位差产生输出误差信号。 该输出误差信号作为控制信号提供给跟踪带通滤波器。 该输出误差信号也通过低通滤波器以获得解调信号。

公开(公告)号：US3590276A

公开(公告)日：1971-06-29

申请号：US3590276D

申请日：1969-04-24

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： WATSON JOHN D

IPC: H03D3/26 ,  H03K5/153 ,  H03K5/20 ,  H03K1/12

CPC classification number: H03D3/26 ,  H03K5/153

Abstract: Described is apparatus for generating an electrical pulse each time an input alternating current signal passes through a complete 360* cycle, the pulse having a fixed phase angle with respect to the zero crossing starting point of each 360* cycle. This is accomplished by means of a resistance-capacitance network in which the capacitor is connected across the emitter-base junction of a switching transistor. When an alternating current input is applied across the resistance-capacitance network, the capacitor will charge only when the emitter-base junction is reverse biased. When the voltage waveform across the capacitor reaches the zero crossing point, the transistor will fire to produce an output pulse. Since this waveform across the capacitor lags the input alternating current waveform by an amount dependent upon the time constant of the resistance-capacitance network, the pulses produced at the output of the transistor switch will always bear a fixed phase relationship with respect to the alternating current input.

公开(公告)号：US3586986A

公开(公告)日：1971-06-22

申请号：US3586986D

申请日：1969-02-19

Applicant: INT STANDARD ELECTRIC CORP

Inventor： MARTENS JEAN VICTOR ,  NATENS MARCEL CLEMENT RENE

IPC: H03D3/26

CPC classification number: H03D3/26

Abstract: A frequency selective network is coupled to an input signal source and two output detecting circuits to produce the desired output signal. The selective network is coupled in parallel with the source and includes a two terminal reactive network exhibiting at least one reversal of sign at a predetermined frequency in series with a two terminal resistive network. One of the detecting circuits includes a unity gain transistor amplifier coupled to be responsive to the voltage across the reactive network, and a first output transistor coupled to the output of the amplifier. The other of the detecting circuits includes a second output transistor coupled to be responsive to the voltage across the resistive network. The first output transistor is of a conductivity type opposite to the conductivity type of the second output transistor and the transistor of the amplifier and the collectors of the first and second output transistors are connected directly together to provide the desired output signal.

公开(公告)号：US3533000A

公开(公告)日：1970-10-06

申请号：US3533000D

申请日：1967-10-27

Applicant: SPERRY RAND CORP

Inventor： BUSHNELL THOMAS R

IPC: H03D3/26 ,  H03C3/20 ,  H03D3/14 ,  H03J3/18

CPC classification number: H03D3/26

公开(公告)号：US3413560A

公开(公告)日：1968-11-26

申请号：US46183865

申请日：1965-06-07

Applicant: WARWICK ELECTRONICS INC

Inventor： AUROOY PETER H VAN

IPC: H03D3/26

CPC classification number: H03D3/26

公开(公告)号：US3404318A

公开(公告)日：1968-10-01

申请号：US36610464

申请日：1964-05-08

Applicant: SPRAGUE ELECTRIC CO

Inventor： JOSEPH LINDMAYER ,  WRIGLEY CHARLES Y

IPC: H01L29/00 ,  H03D3/26 ,  H03D7/04 ,  H03K3/313

CPC classification number: H03K3/313 ,  H01L29/00 ,  H03D3/26 ,  H03D7/04 ,  Y10S257/914