Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1981-12-15
1984-12-18
Miller, Stanley D.
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 20, 360 362, 360 371, 328155, H03L 722, H04N 595
Patent
active
044892870
ABSTRACT:
A phase sychronizing circuit for a device which reproduces digital data has a phase locked loop including a first phase comparison circuit, a voltage controlled oscillator (VCO) producing an output the frequency of which is controlled by the first phase comparison circuit, and a first frequency divider to divide the output frequency of the VCO. The phase synchronizing circuit further includes second frequency divider for dividing the output frequency of the VCO, a second phase comparison circuit for comparing the phase of a first clock signal from the first frequency divider, with that of a second clock signal from the second frequency divider and a circuit for controlling the frequency dividing ratio of the first frequency dividing circuit according to the phase difference between the first and second clock signals in such a way that the frequency dividing ratio becomes one of 1/N, 1/(N+1) and 1/{(N+(N+1))/2} wherein N is a positive integer.
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Ratz, A. et al., "Automatic Tape Editing Equipment" IEEE Trans. on Space Electronics & Telemetry vol. T-Set 9, No. 2 (Jun. 63) pp. 51-60.
Klinger, R. "Frequenzaufbereitung fur mobile und tragbare funkgerate mit quarzsparenden Shaltungen" Nachrictentechnische Zeitschrift, vol. 31, No. 3 (Mar. 78), pp. 207-209.
Kojima Tadashi
Nagumo Masahide
Miller Stanley D.
Paxman W. R.
Tokyo Shibaura Denki Kabushiki Kaisha
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