System for compensation of VCO non-linearity

Details System for compensation of VCO non-linearity System for compensation of VCO non-linearity

2007-09-24

2009-06-02

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C331S034000, C327S156000, C375S376000

Reexamination Certificate

active

07541879

ABSTRACT:
A nonlinearity-compensated section has a pre-set compensation table containing a measured value of a voltage vtc, outputted from a loop filter, which is changed accordingly with respect to a change in a voltage vtfc outputted from a frequency controlling section. The nonlinearity-compensated section sets, in the compensation table, the voltage vtfc of an oscillatory frequency oscillated by a VCO and the voltage vtc associated therewith as reference voltages, and creates a look-up table containing voltage differences obtained by subtracting the above-described reference voltages from the voltages vtfc and vtc, respectively. Thereafter, the nonlinearity-compensated section extracts a compensation value corresponding to the voltage vtc actually outputted from the loop filter by means of the look-up table, and adds the compensation value to an input modulated signal adjusted by a multiplier so as to be outputted.

REFERENCES:
patent: 6774738 (2004-08-01), Hammes et al.
patent: 7002416 (2006-02-01), Pettersen et al.
patent: 7061341 (2006-06-01), Groe

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