Frequency synthesizer having a phase-locked loop structure for f

Details Frequency synthesizer having a phase-locked loop structure for f Frequency synthesizer having a phase-locked loop structure for f

1995-06-07

1996-06-25

Pascal, Robert

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

455260, 327105, 327107, H03L 706, H03L 718

Patent

active

055304060

ABSTRACT:
Based on a phase lock loop structure, having a reference signal generator (1), a first phase detector (2), a low pass filter (3), a VCO (4) and a frequency divider (5), in order to achieve a faster channel switching an maintain the design of the filters to be as simple as possible, a second phase detector (6) is provided that receives the reference signal (9) and a second output signal (11) coming from the frequency divider (5) and shifted 90.degree. with respect to its other output signal (10), and that generates a second phase error signal (13), in quadrature with the first phase error signal (12), that is filtered by a second low pass filter (7) thereby generating a second filtered phase error signal (15). The two filtered phase error signals (14,15) are provided to a quadratic correlator (8) whose output is provided to the VCO (4). Its amplitude is proportional to the difference of frequencies between the reference signal (9) and any of the output signals (10,11) from the frequency divider (5).

REFERENCES:
patent: 3568067 (1971-03-01), Williford
patent: 3748590 (1973-07-01), Gray
patent: 3768030 (1973-10-01), Brown et al.
patent: 3789316 (1974-01-01), Goetz et al.
patent: 4100503 (1978-07-01), Lindsey et al.
patent: 4143322 (1979-03-01), Shimamura
patent: 4314206 (1982-02-01), Attwood et al.
patent: 4358740 (1982-11-01), Dinter
patent: 4470145 (1984-09-01), Williams
patent: 4507617 (1985-03-01), Sasaki
patent: 5036296 (1991-07-01), Yoshida
"Double Loop PLL Based Frequency Synthesizer With A Continuous Phase Divider" by Ori Kost, et al, The 15th Conference of Electrical & Electronics Engineers in Israel, Apr. 7-9, 1987, pp. 1-3.

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