Method and apparatus for calibrating an adjustable frequency gen

Details Method and apparatus for calibrating an adjustable frequency gen Method and apparatus for calibrating an adjustable frequency gen

1986-07-21

1987-06-30

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

331 11, 331 16, 331 17, 331 25, 331 44, 331 14, H03L 700, H03L 716

Patent

active

046773940

ABSTRACT:
A method for calibrating an adjustable frequency generator having a voltage-controlled oscillator which is preceded by a computer via a digital-to-analog converter. The control input of the oscillator is coupled to a calibrating device comprising a series circuit comprising a digital phase detector and a lowpass filter forming a phase-locked loop circuit arrangement. By the computer, a digital-to-analog converter is caused, upon a frequency reference value signal, to deliver a control voltage to the oscillator which corresponds to the output voltage of the lowpass filter prior to the start of the calibrating process. A digital value corresponding to the control voltage is stored in the computer together with a digital reference value corresponding to the given frequency.

REFERENCES:
patent: 4103250 (1978-07-01), Jackson
patent: 4511858 (1985-04-01), Charavit et al.
patent: 4513448 (1985-04-01), Maher
patent: 4584539 (1986-04-01), Stankey
U. Tietze and Ch. Schenk, "Halbleiter-Schaltungstechnik", 4th ed., 1978, pp. 413, 440, 441 and 692.
Roland Best, "Theorie und Anwendungen des Phase-Locked Loops", 3rd ed., 1982, p. 16, last line.

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