Phase locked circuit

Abstract

Abstract PURPOSE:To eliminate a steady deviation existing between inlut and output phases by providing a voltage control 1-shot circuit after the input phase. CONSTITUTION:When the cycle of a phase A supplied to an input terminal 1 is smaller than a normal cycle, the output A' of a voltage control 1-shot circuit 7 is set at a high level with the rise of the phase A and turned into one shot of T1'/2 pulse width. In this case, the T1'/2 is set larger than the cycle T1 of the phase A by an amount equivalent to a steady deviation K. The phase difference between the fall of the signal A' and the fall of the signal E of an output terminal 6 is delivered to the output B of a phase difference detecting circuit 2. A pulse having width equivalent to the deviation K is delivered to the signal C. Then the voltage that secures coincidence between the frequency of the output signal E of a voltage control oscillator 5 and the frequency of the input signal A is delivered to the output D of a filter circuit 4. As a result, the coincidence is obtained between phases of signals A and E.

Inventors

• 👤 Kazuo Isaka
• 👤 井坂　和雄

Bibliographic Details