Multi-point modulation and VCO compensation

Details Multi-point modulation and VCO compensation Multi-point modulation and VCO compensation

2007-08-06

2009-08-18

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S034000, C331S17700V

Reexamination Certificate

active

07576615

ABSTRACT:
The present invention, generally speaking, provides a VCO linearization technique applicable to advanced loop architectures. In particular, the linearization technique is applicable to a mostly-digital frequency locked loop (FLL), phase locked loop (PLL) or the like using multi-point modulation. In an exemplary embodiment, a correction table is used to form a corrected control variable that affects one modulation point only (e.g., a fast modulation path) of the multi-point modulation circuit. The other modulation point (e.g., a slow modulation path) of the multi-point modulation circuit is controlled in accordance with an error-forming circuit including a loop filter. The use of correction within the fast path enables the VCO to achieve more rapid phase changes than would otherwise be possible, an advantage in high-data-rate communications applications, for example.

REFERENCES:
patent: 4706047 (1987-11-01), Avila et al.

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