Frequency synthesizer having phase control loop with plural bran

Details Frequency synthesizer having phase control loop with plural bran Frequency synthesizer having phase control loop with plural bran

1992-06-26

1993-10-19

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

331 14, 331 25, H03L 7087, H03L 7191

Patent

active

052549593

ABSTRACT:
The invention relates to a circuit arrangement for frequency synthesis with a phase control circuit (1) which comprises a first phase discriminator (3) for receiving a reference signal and an output signal supplied by a first frequency divider (6) with a division ratio k, a low-pass filter (4) coupled to the output of the first phase discriminator (3), and an oscillator (5) coupled to the output of the low-pass filter (4) for generating an output signal which can be supplied to the first frequency divider (6). At least one further branch (2) with a further phase discriminator (8) and a further frequency divider (9) which is to be released and which has a division ratio k is present. The further phase discriminator (8) coupled to the input of the low-pass filter (4) is designed for receiving the reference signal delayed by a delay element (10) and the output signal of the further frequency divider (9) provided for receiving the output signal of the oscillator (5). Each delay element (10) has a different delay time corresponding to a fraction of a period T=1/(n*f.sub.ref) of the reference signal, n being the number of branches (1,2) and f.sub.ref being the frequency of the reference signal. A control unit (11) releases the frequency divider (9) approximately after the delay time of the delay element (10) assigned to the relevant frequency divider (9).

REFERENCES:
patent: 3571743 (1971-03-01), Menkes
patent: 4697156 (1987-09-01), Rudolph
patent: 4800342 (1989-01-01), Jackson
patent: 4888564 (1989-12-01), Ishigaki
patent: 4912432 (1990-03-01), Galani et al.

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