| 摘要 |
A controlled oscillator suitable for construction largely in integrated circuit form includes an oscillating amplifier stage and a regenerative feedback loop including a resonant frequency determining element coupled to the amplifier stage for providing an oscillatory reference signal. A phase shift network is provided outside the loop for shifting the phase of the oscillatory signal a predetermined amount. A control circuit which is supplied with the phase shifted oscillatory signal to produce anti-phase signal outputs is responsive to control signal representative of the phase and/or frequency of a predetermined reference signal for selecting portions of the anti-phase output signals. A combining network sums the oscillatory signal and the selected portions from the control circuit to produce a combined signal with a resultant phase which is supplied to the oscillating amplifier stage for maintaining the oscillatory signal in desired relation with the reference signal. |
