Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Patent
1997-03-19
1998-10-20
Nelms, David C.
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
331 2, 455260, 455313, 455323, 455 76, 455118, 455119, 327113, 327117, 327156, 327105, H03L 700
Patent
active
058252541
ABSTRACT:
A frequency converter capable of providing a highly stable frequency by frequency feedback using a phase locked loop circuit. The frequency converter includes a local oscillator; a frequency converter for mixing an output of the local oscillator and a feedback frequency therefrom to generate a mixed frequency; a first filter for filtering the mixed frequency; a phase comparator for generating a voltage signal corresponding to a phase difference in between an input frequency to the frequency convertor and the output frequency of the first filter; a second filter for converting the voltage signal of the phase comparator to a constant polarity voltage and eliminating any noise component of the converted voltage signal; and a voltage controlled oscillator receiving the output of the second filter as a control voltage so as to provide a stable output frequency by generating the feedback frequency responsive to the control voltage.
REFERENCES:
patent: 4831339 (1989-05-01), Nemeth
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patent: 5414391 (1995-05-01), Hori
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Basic principles of the Frequency Synthesis Theory by Shapiro D.N., et al., Moscow, Radio-Yi-Svyas publishers, 1981, p. 155.
Radio Receiving Devices by Chistyakov N.T. et al. Moscow, "Svyaz" publishers, 1974, pp. 18-19.
Phase-locked Loops by Shahghildyan V.V., et al., Moscow, SVYAZ publishers, 1972, pp. 27-28.
Bushnell Esq. Robert E.
Nelms David C.
Samsung Electronics Co,. Ltd.
Tran Andrew Q.
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