公开(公告)号：US1675457A

公开(公告)日：1928-07-03

申请号：US16672427

申请日：1927-02-08

申请人： FRED D JOHNSON ,  W N BUTLER

发明人： MATHEWS THEODORE A

IPC分类号： F04B41/02

CPC分类号： F04B41/02 ,  Y10T137/86019 ,  Y10T137/86051 ,  Y10T137/86163

公开(公告)号：US4825294A

公开(公告)日：1989-04-25

申请号：US106078

申请日：1987-10-07

申请人： Fred D. Johnson

发明人： Fred D. Johnson

IPC分类号： H04N9/64 ,  H04N5/68

CPC分类号： H04N9/648

摘要： An RGB video output drive amplifier is provided with current limiting circuitry at the base of the driver circuit. In a preferred embodiment, the driver circuit comprises a drive transistor with associated biasing circuits. The base of the drive transistor is coupled to a current limiting circuit to shunt excess current from the base of the transistor and to block additional input current at or near the level representative of the driver transistor reaching its saturation mode. Excess current is dissipated through associated resistance in the base circuit and while diode means prevent high input signals from driving the drive transistor into saturation. Maintaining the drive transistor at or below its saturation level pevents flaring in the resulting video picture display. No appreciable storage charge is built up during the short periods which the drive transistor may enter saturation in response to rapid transients provided through a transient response circuit in parallel with the current limiting circuit. Detail in the resulting picture is optimized and minimal additional capacitance is added to the output circuitry.

摘要翻译： RGB视频输出驱动放大器在驱动器电路的基极设有限流电路。 在优选实施例中，驱动器电路包括具有相关偏置电路的驱动晶体管。 驱动晶体管的基极耦合到限流电路，以分流来自晶体管的基极的过剩电流，并阻止在代表驱动晶体管达到饱和模式的电平处或附近的附加输入电流。 过电流通过基极电路中的相关电阻消散，而二极管意味着防止高输入信号驱动驱动晶体管饱和。 将驱动晶体管保持在其饱和水平以下或低于其饱和水平，从而产生视频图像显示。 在短时间内不会产生明显的存储电荷，驱动晶体管可以响应于通过与限流电路并联的瞬态响应电路提供的快速瞬变而进入饱和状态。 所得图片中的细节被优化，并且最小的附加电容被添​​加到输出电路。

公开(公告)号：US4370674A

公开(公告)日：1983-01-25

申请号：US239969

申请日：1981-03-03

申请人： Fred D. Johnson ,  Michael D. Flasza ,  Wayne E. Bretl

发明人： Fred D. Johnson ,  Michael D. Flasza ,  Wayne E. Bretl

IPC分类号： H04N9/72 ,  H04N9/16

CPC分类号： H04N9/72

摘要： A stabilization network is disclosed which compensates for variable emission characteristics of a cathode in a television receiver's cathode ray tube. During the receiver's vertical interval, a variable gain video amplifier applies a black level D.C. voltage to the cathode. The resulting cathode current is sensed and compared to a low level reference current. If the cathode current does not equal the reference current, a control signal is applied to the amplifier. The amplifier responds to changing its D.C. output voltage until the cathode current is equal to the reference current. The amplifier also responds to the control signal by altering its gain so that, when a video signal is received, the cathode develops peak white currents of a given value in response to peak white portions of the video signal.

摘要翻译： 公开了稳定网络，其补偿电视接收机的阴极射线管中的阴极的可变发射特性。 在接收机的垂直间隔期间，可变增益视频放大器将黑电平直流电压施加到阴极。 所得到的阴极电流被检测并与低电平参考电流进行比较。 如果阴极电流不等于参考电流，则控制信号被施加到放大器。 放大器响应改变直流输出电压直到阴极电流等于参考电流。 放大器还通过改变其增益来响应控制信号，使得当接收到视频信号时，阴极响应于视频信号的峰值白色部分产生给定值的峰值白电流。

公开(公告)号：US4309718A

公开(公告)日：1982-01-05

申请号：US189498

申请日：1980-09-22

申请人： Fred D. Johnson

发明人： Fred D. Johnson

IPC分类号： H04N17/04 ,  H04N9/62

CPC分类号： H04N17/04

摘要： A service switch arrangement for a color television receiver having a low level matrixing system developing red, blue and green color signals includes a service switch having a normal position and a service position. In the normal position of the switch, a video output amplifier is enabled for coupling the red, blue and green color signals to the electron gun cathode elements of a color cathode ray tube. In the service position of the switch, the video output amplifier is disabled while an independently generated DC control voltage is coupled to the electron gun cathode elements for facilitating adjustment of the cut-off points of the cathode elements.

摘要翻译： 具有开发红色，蓝色和绿色信号的低级矩阵系统的彩色电视接收机的服务开关装置包括具有正常位置和服务位置的服务开关。 在开关的正常位置，使视频输出放大器能够将红色，蓝色和绿色信号耦合到彩色阴极射线管的电子枪阴极元件。 在开关的使用位置，视频输出放大器被禁用，而独立产生的DC控制电压耦合到电子枪阴极元件，以便于调节阴极元件的截止点。

公开(公告)号：US4390817A

公开(公告)日：1983-06-28

申请号：US238771

申请日：1981-02-27

申请人： Fred D. Johnson

发明人： Fred D. Johnson

IPC分类号： H04N3/24 ,  H01J29/70 ,  H01J29/72

CPC分类号： H04N3/24

摘要： An integratable CRT spot cut-off network is described for use in a television receiver. The network establishes a reference current for biasing up the receiver's G.sub.1 grid when the supply voltage comes up, and a bypass capacitor coupled to the grid charges toward the supply voltage. When the receiver is turned off, the network terminates the reference current as the supply voltage starts to collapse and prevents the bypass capacitor from discharging. The charge stored on the capacitor reverse biases the grid to cut off the receiver's beam current.

摘要翻译： 描述了用于电视接收机的可集成的CRT截止网络。 网络建立一个参考电流，用于在电源电压出现时对接收器的G1电网进行偏置，并且耦合到电网的旁路电容向电源电压充电。 当接收机关闭时，网络终止参考电流，因为电源电压开始崩溃，防止旁路电容器放电。 存储在电容器上的电荷反向偏置电网以切断接收器的电流。

公开(公告)号：US4446443A

公开(公告)日：1984-05-01

申请号：US379838

申请日：1982-05-20

申请人： Fred D. Johnson ,  Michael D. Flasza ,  George J. Tzakis

发明人： Fred D. Johnson ,  Michael D. Flasza ,  George J. Tzakis

IPC分类号： H03F1/02 ,  H03F1/34 ,  H03F3/45 ,  H03F3/26 ,  H04N5/44

CPC分类号： H03F1/02 ,  H03F1/34

摘要： An integratable amplifier is disclosed for developing a high level output signal with reduced power dissipation. The amplifier includes a first circuit (108, 110) which responds to an input signal for developing first and second signal currents whose amplitudes increase and decrease, respectively, in response to an input signal transition of a given direction. A second circuit (32a) receives the first signal current for establishing a third signal current which mirrors the first signal current. The second and third signal currents are received by a third circuit (70a) for conversion thereof to an amplified output signal. To stabilize the gain of the amplifier, a negative feedback path (50a) is coupled between the input signal and the output signal.

摘要翻译： 公开了一种用于开发具有降低功耗的高电平输出信号的可积分放大器。 放大器包括响应于输入信号的第一电路（108,110），用于分别响应于给定方向的输入信号转换而开发振幅增加和减小的第一和第二信号电流。 第二电路（32a）接收用于建立第三信号电流的第一信号电流，其反映第一信号电流。 第二和第三信号电流由第三电路（70a）接收，用于将其转换成放大的输出信号。 为了稳定放大器的增益，负反馈路径（50a）耦合在输入信号和输出信号之间。

公开(公告)号：US4347528A

公开(公告)日：1982-08-31

申请号：US244422

申请日：1981-03-16

申请人： Fred D. Johnson ,  George J. Tzakis

发明人： Fred D. Johnson ,  George J. Tzakis

IPC分类号： H04N9/64 ,  H04N9/62 ,  H04N9/20

CPC分类号： H04N9/648

摘要： A circuit is disclosed for establishing proper video output voltages in a color television receiver prior to setting the receiver's G2 voltage. In the preferred embodiment, the circuit includes three emitter follower stages, each coupled to the output of a video amplifier. The collectors of the emitter follower stages are coupled to a supply voltage through a common resistance. A two position switch is connected across the common resistance such that, during normal receiver operation, closure of the switch shunts the common resistance. When G2 set-up is to be effected, the switch is opened so that a predetermined voltage is dropped across the common resistance and the three emitter follower stages have similar, predetermined D.C. output voltages.

摘要翻译： 公开了一种用于在设置接收机的G2电压之前在彩色电视接收机中建立适当的视频输出电压的电路。 在优选实施例中，电路包括三个发射极跟随器级，每个发射极跟随器级耦合到视频放大器的输出端。 射极跟随器级的集电极通过公共电阻耦合到电源电压。 两个位置开关连接在公共电阻上，使得在正常的接收器操作期间，开关的闭合分流公共电阻。 当要实现G2设置时，开关断开，使得预定电压在公共电阻上下降，并且三个射极跟随器级具有相似的预定直流输出电压。

公开(公告)号：US1574231A

公开(公告)日：1926-02-23

申请号：US4834625

申请日：1925-08-05

申请人： FRED D JOHNSON

发明人： CARROLL ANDREW L

IPC分类号： B60B37/10

CPC分类号： B60B37/10