公开(公告)号：US4520327A

公开(公告)日：1985-05-28

申请号：US388630

申请日：1982-06-15

申请人： Roland Myers

发明人： Roland Myers

IPC分类号： H03L7/02 ,  H03L7/181 ,  H03L7/00

CPC分类号： H03L7/02 ,  H03L7/181

摘要： A variable frequency oscillator 10 has an output frequency Fo responsive to a voltage input Vo derived from an analogue integrator 11 controlled by potentiometer 15, 16, the frequency Fo being displayed on frequency meter 19 having a ghost least significant digit. A converter 24 responds to the digit of a digital output fed to a digital to analogue converter 20 providing an error voltage Ve whose magnitude is proportional to the deviation of the digit from a datum, e.g. 5, and whose polarity depends on whether the deviation is + or -. The voltage Ve is also fed to the integrator 11 to control the voltage Vo.An arrangement is also described in which the voltage Ve is derived from the divider chain of a gate period generator controlling a frequency counter whose input is Fo.

摘要翻译： 可变频率振荡器10具有响应于由电位计15,16控制的模拟积分器11导出的电压输入Vo的输出频率Fo，频率仪表19上显示的频率Fo具有重影最小有效数字。 A转换器24响应馈送到数模转换器20的数字输出的数字，提供误差电压Ve，其幅度与数字与数据的偏差成比例，例如。 5，其极性取决于偏差是+还是 - 。 电压Ve也被馈送到积分器11以控制电压Vo。 还描述了其中电压Ve从控制输入为Fo的频率计数器的门限周期发生器的分频器导出的装置。