公开(公告)号：US3832653A

公开(公告)日：1974-08-27

申请号：US38961073

申请日：1973-08-20

Applicant: WESTINGHOUSE ELECTRIC CORP

Inventor： NUGENT J ,  CLAYPOOL H

IPC: H03B5/32 ,  H03B1/00 ,  H03B5/36

CPC classification number: H03B5/36 ,  H03B2200/0034 ,  H03B2200/007 ,  H03B2200/0088 ,  H03B2201/018

Abstract: A signal generator for generating a high power low noise RF signal is disclosed. The generator includes a low noise crystal control oscillator for generating a relatively low power, low noise RF signal. The output signal of the oscillator is coupled to a high power RF amplifier which amplifies this signal to generate the low noise high power RF signal. The low frequency noise of the oscillator is reduced by a low frequency negative feedback loop in the oscillator circuit. Noise induced into the oscillator circuit by load changes in the power amplifier is reduced by designing the amplifier such that its input impedance is substantially constant for all phase angles of the RF signal. The operating frequency of the generator may be changed by switching the crystal which determines the operating frequency of the oscillator. The bandwidth of the oscillator and the amplifier are such that the operating frequency of the oscillator can be changed over a relatively wide range without circuit readjustments.

Abstract translation: 公开了一种用于产生高功率低噪声RF信号的信号发生器。 发生器包括用于产生相对低功率，低噪声RF信号的低噪声晶体控制振荡器。 振荡器的输出信号耦合到高功率RF放大器，放大该信号以产生低噪声高功率RF信号。 振荡器电路中的低频负反馈环路降低了振荡器的低频噪声。 通过设计放大器使得其输入阻抗对于RF信号的所有相位角基本上是恒定的而减小了通过功率放大器中的负载变化而引入到振荡器电路中的噪声。

公开(公告)号：US20130043957A1

公开(公告)日：2013-02-21

申请号：US13212762

申请日：2011-08-18

Applicant: Hajime SHIBATA

Inventor： Hajime SHIBATA

IPC: H03B5/12 ,  H03H11/00

CPC classification number: H03H11/245 ,  H03B5/00 ,  H03B2201/011 ,  H03B2201/018 ,  H03B2201/0208 ,  H03B2201/025

Abstract: A tunable impedance circuit can include a fixed impedance and one or more impedance selection circuits. Each impedance selection circuit can include a first impedance connected to a first interface terminal, a second impedance connected to a second interface terminal, and a plurality of series-connected transistors connected between the first and second impedances. Each impedance selection circuit can also include a plurality of drive impedance networks connected to gates, sources, drains, bodies, and isolation regions of the series-connected transistors, and a control circuit to provide a plurality of control signals to the drive impedance networks to turn on and turn off the series-connected transistors. For each impedance selection circuit, turning on and turning off the respective plurality of series-connected transistors can bring the series combination of the respective first and second impedances into and out of electrical communication with, e.g., into and out of parallel with, the fixed impedance.

Abstract translation: 可调谐阻抗电路可以包括固定阻抗和一个或多个阻抗选择电路。 每个阻抗选择电路可以包括连接到第一接口端子的第一阻抗，连接到第二接口端子的第二阻抗以及连接在第一和第二阻抗之间的多个串联连接的晶体管。 每个阻抗选择电路还可以包括连接到串联连接晶体管的栅极，源极，漏极，主体和隔离区域的多个驱动阻抗网络，以及控制电路，以向驱动阻抗网络提供多个控制信号 打开并关闭串联晶体管。 对于每个阻抗选择电路，导通和关断相应的多个串联晶体管可以使相应的第一和第二阻抗的串联组合进入和流出与例如固定的 阻抗。

公开(公告)号：US3763440A

公开(公告)日：1973-10-02

申请号：US3763440D

申请日：1972-04-24

Applicant: INTEGRATED SYSTEMS TECHNOLOGY

Inventor： GARCIA H ,  PEEK B

IPC: H03B5/32 ,  H03B1/00 ,  H03B5/36 ,  H03L1/02 ,  H03B3/04

CPC classification number: H03L1/022 ,  H03B5/368 ,  H03B2200/0048 ,  H03B2200/0056 ,  H03B2201/018 ,  H03B2201/0258

Abstract: A signal generation circuit includes a crystal oscillator for generating an oscillatory signal and a temperature compensation circuit coupled to the oscillator for controlling the capacitance loading of the crystal in the oscillator. The temperature compensation circuit includes a temperature sensing device and operates to develop a first capacitance in a first temperature range, a second capacitance which varies at a ertain rate with the variation in temperature in a second temperature range, and a third capacitance which varies at a different rate with the variation in temperature in a third temperature range.

Abstract translation: 信号发生电路包括用于产生振荡信号的晶体振荡器和耦合到振荡器的温度补偿电路，用于控制振荡器中的晶体的电容负载。 温度补偿电路包括温度检测装置，其工作是在第一温度范围内开发第一电容，第二电容随第二温度范围内的温度变化而以不变速率变化，第三电容在 与第三温度范围内的温度变化不同的速率。

公开(公告)号：US09350321B2

公开(公告)日：2016-05-24

申请号：US13212762

申请日：2011-08-18

Applicant: Hajime Shibata

Inventor： Hajime Shibata

IPC: H03B5/12 ,  H03C3/09 ,  H03H11/24 ,  H03B5/00

CPC classification number: H03H11/245 ,  H03B5/00 ,  H03B2201/011 ,  H03B2201/018 ,  H03B2201/0208 ,  H03B2201/025

Abstract: A tunable impedance circuit can include a fixed impedance and one or more impedance selection circuits. Each impedance selection circuit can include a first impedance connected to a first interface terminal, a second impedance connected to a second interface terminal, and a plurality of series-connected transistors connected between the first and second impedances. Each impedance selection circuit can also include a plurality of drive impedance networks connected to gates, sources, drains, bodies, and isolation regions of the series-connected transistors, and a control circuit to provide a plurality of control signals to the drive impedance networks to turn on and turn off the series-connected transistors. For each impedance selection circuit, turning on and turning off the respective plurality of series-connected transistors can bring the series combination of the respective first and second impedances into and out of electrical communication with, e.g., into and out of parallel with, the fixed impedance.

Abstract translation: 可调谐阻抗电路可以包括固定阻抗和一个或多个阻抗选择电路。 每个阻抗选择电路可以包括连接到第一接口端子的第一阻抗，连接到第二接口端子的第二阻抗以及连接在第一和第二阻抗之间的多个串联连接的晶体管。 每个阻抗选择电路还可以包括连接到串联连接晶体管的栅极，源极，漏极，主体和隔离区域的多个驱动阻抗网络，以及控制电路，以向驱动阻抗网络提供多个控制信号 打开并关闭串联晶体管。 对于每个阻抗选择电路，导通和关断相应的多个串联晶体管可以使相应的第一和第二阻抗的串联组合进入和流出与例如固定的 阻抗。

公开(公告)号：US4379271A

公开(公告)日：1983-04-05

申请号：US180580

申请日：1980-08-25

Applicant: William L. Lehmann

Inventor： William L. Lehmann

IPC: H04B1/26 ,  H03B1/00 ,  H03B5/12 ,  H03J5/02 ,  H03J5/24 ,  H04B1/16 ,  H04N5/44

CPC classification number: H03J5/242 ,  H03B5/1203 ,  H03B5/1231 ,  H03B5/1243 ,  H03B5/1296 ,  H03J5/0272 ,  H03B2201/018

Abstract: In a multiband tuner, an input arrangement for selectively applying first and second local oscillator signals to a single input of a prescaler of a phase locked loop tuning system includes a first capacitor connected in series from the output of a first local oscillator to the prescaler input, a second capacitor and inductor connected in series from one output of a second local oscillator to the same prescaler input and a diode switching arrangement for selectively coupling a third capacitor between the junction of the second capacitor and the inductor and signal ground when the first local oscillator is enabled to operate. The first capacitor, inductor and third capacitor comprise a matching network for the output of the first local oscillator. The second capacitor and inductor form a series tuned circuit in the frequency band of the second local oscillator which rejects signals in the frequency band of the first local oscillator. The arrangement is particularly advantageous for allowing the UHF input of a prescaler intended for a VHF/UHF tuner to be used for dividing the frequency of a superband cable local oscillator signal as well as for dividing the frequency of a UHF local oscillator signal.

Abstract translation: 在多频段调谐器中，用于选择性地将第一和第二本机振荡器信号施加到锁相环调谐系统的预分频器的单个输入的输入装置包括从第一本地振荡器的输出到预分频器输入串联连接的第一电容器 ，从第二本地振荡器的一个输出端串联连接到相同的预分频器输入端的第二电容器和电感器，以及二极管开关装置，用于在第二电容器和电感器的接点之间选择性地耦合第三电容器，并且当第一本地 振荡器使能运行。 第一电容器，电感器和第三电容器包括用于第一本地振荡器的输出的匹配网络。 第二电容器和电感器在第二本地振荡器的频带中形成一个串联调谐电路，其抑制第一本地振荡器的频带中的信号。 该装置特别有利于允许用于VHF / UHF调谐器的预分频器的UHF输入用于分频超频带电缆本地振荡器信号的频率以及用于分频UHF本地振荡器信号的频率。