公开(公告)号：EP0267332A1

公开(公告)日：1988-05-18

申请号：EP86308734.2

申请日：1986-11-10

申请人： Weeks, Richard W.

发明人： Weeks, Richard W.

IPC分类号： H03B5/36

CPC分类号： H03B5/368 ,  H03B5/362 ,  H03B2200/004 ,  H03B2201/0208 ,  H03C3/22

摘要： A direct frequency modulation crystal-controlled oscillator circuit is provided having a configuration which minimizes the number of parts required for modulation while maintaining a linear relationship between the incoming modulation voltage and the outputted frequency. The circuit includes a tuning diode (12) in a parallel arrangement with a tank circuit (22) connected to the collector of a transistor (20). In the preferred embodiment, the tank circuit includes only an inductor (24). The crystal (26) of the circuit operates in the anti-resonant mode and its impedance is much greater than that of the tank circuit (22). Direct frequency modulation results from the frequency change of the crystal (26) in responding to a phase change caused by the modulation voltage applied to the tuning diode (12), which subsequently results in a change in the phase of a transistor collector voltage. The desired linear relationship is achieved over a frequency range by prop er selection of the tuning diode (12), wherein the I non-linearity that exists between voltage and capacitance associated with the tuning diode is compensated for by the offsetting non-linearity that exists between capacitance and frequency associated with the tank circuit (22).

摘要翻译： 提供一种直接调频晶体振荡器电路，其具有使输入调制电压和输出频率之间保持线性关系的同时最小化调制所需的部件数量的配置。 该电路包括与并联布置的调谐二极管（12），其与连接到晶体管（20）的集电极的振荡电路（22）连接。 在优选实施例中，储能电路仅包括电感器（24）。 电路的晶体（26）以反谐振模式工作，其阻抗远大于电路（22）的阻抗。 响应由施加到调谐二极管（12）的调制电压引起的相位变化，晶体（26）的频率变化导致直接频率调制，其随后导致晶体管集电极电压的相位变化。 通过调谐二极管（12）的适当选择，在频率范围内实现期望的线性关系，其中存在于与调谐二极管相关联的电压和电容之间的非线性由电容之间存在的偏移非线性补偿 和与所述电路（22）相关联的频率。