| 摘要 |
<p>A phase locking system for phase/frequency providing a sampling signal which is to be phase frequency locked to an applied signal includes a controllable oscillator (86) coupled to a sampling circuit (50-53) to produce samples of the applied signal representing substantially quadrature phase related components of the applied signal. An accumulator (54,58,60) respectively accumulates the quadrature phase components over predetermined intervals. A differencing circuit (62-70) successively forms the differences of one of the components from successive intervals. The differences are used (74,88-94,108) to generate a control signal to alter the signal generated by the controlled oscillator.</p> |
