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热词
    • 8. 发明公开
    • Wide range oscillator
    • Oszillator mit grossem Bereich。
    • EP0270298A2
    • 1988-06-08
    • EP87310386.5
    • 1987-11-25
    • RCA Thomson Licensing Corporation
    • Muterspaugh, Max Ward
    • H03B5/12
    • H03B5/1228H03B5/1203H03B5/1243H03B5/1296H03B2200/0008H03B2200/004H03B2200/0048H03B2200/0056H03B2201/0208
    • A local oscillator (7), arranged e.g. in a Colpitts type configuration, includes an amplifying device (101) such as a bipolar transistor or field effect transistor having a control electrode (G1) (base or gate electrode) which is coupled to a first electrode (S) (emitter or source electrode), defining one end of a conduction channel, through an oscillation conditioning network (200) for conditioning the device to oscillate in a given range, and also to a frequency determining network (300) including a first varactor diode (307) responsive to the tuning voltage (TV) and an inductance element (305) coupled in series between the control electrode (G1) and signal ground. The output is taken at a second electrode (D) (collector or drain) defining the other end of the conduction channel. A range extending circuit (205) including a second varactor diode (209) responsive to the tuning voltage is coupled between the control electrode and signal ground for ensuring that the oscillator operates reliably at both ends of the tuning range. In an alternative arrangement the frequency determining network comprises a parallel combination of inductance and first varactor diode, and the second varactor diode is connected in series between it and the control electrode.
    • 本机振荡器(7) 在Colpitts型配置中,包括诸如双极晶体管或场效应晶体管的放大装置(101),其具有耦合到第一电极(S)(发射极或源极)的控制电极(G1)(基极或栅电极) ),通过用于调节设备在给定范围内振荡的振荡调节网络(200)定义导通通道的一端,还包括频率确定网络(300),频率确定网络(300)包括响应于所述第一变容二极管 调谐电压(TV)和串联耦合在控制电极(G1)和信号地之间的电感元件(305)。 输出在限定导通通道另一端的第二电极(D)(集电极或漏极)处取出。 包括响应于调谐电压的第二变容二极管(209)的量程扩展电路(205)被耦合在控制电极和信号地之间,以确保振荡器在调谐范围的两端可靠地运行。 在替代布置中,频率确定网络包括电感和第一变容二极管的并联组合,并且第二变容二极管串联连接在其与控制电极之间。