Phase-locked loop frequency tracking device including a direct d

Details Phase-locked loop frequency tracking device including a direct d Phase-locked loop frequency tracking device including a direct d

1990-12-26

1992-07-14

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 4, 331 17, 331 34, 455260, H03L 712, H03L 716

Patent

active

051306719

ABSTRACT:
Disclosed is a single phase-locked loop (50, 350) providing tuning over a very large bandwidth for use in wide band carrier tracking and clock recovery systems. In a first embodiment, a DC signal is formed representative of a phase difference between an input signal changing with time and a return signal. The DC signal is applied to a narrow band voltage controlled oscillator (68) which converts the DC signal back to an AC signal. The AC signal is level shifted to form a clocking pulse for an accumulator (80) of a direct digital synthesizer (72). A digital command word is also applied to the accumulator (80), such that the digital command word represents a coarse tuning of the input frequency. The clocking pulse from the narrow band VCO (68) supplies a fine tuning of the input frequency. In a second embodiment, the DC representative phase signal is applied to an analog-to-digital converter (364) which produces an N-bit word representative of the phase difference. The change in phase alters the digital output of the analog-to-digital converter (364) which in turn is applied to the accumulator (376) of a direct digital synthesizer (370). By this invention, very wide band tracting is capable with a single phase-locked loop, thus limiting the hardware and cost.

REFERENCES:
patent: 4568888 (1986-02-01), Kimura et al.
patent: 4577163 (1986-03-01), Culp
patent: 4855683 (1989-08-01), Troudet et al.
patent: 4951004 (1990-08-01), Sheffer et al.
patent: 4965533 (1990-10-01), Gilmore

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