| US 7,557,671 B2 | ||
| Real time VCO gain non linearity calibration | ||
| Paul Cheng-Po Liang, Santa Clara, Calif. (US) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Feb. 08, 2007, as Appl. No. 11/704,881. | ||
| Prior Publication US 2008/0191811 A1, Aug. 14, 2008 | ||
| Int. Cl. H03C 3/08 (2006.01) | ||
| U.S. Cl. 332—124 [331/44; 331/17] | 22 Claims |
| 1. A method of determining a gain nonlinearity, the method comprising:
receiving a phase difference;
generating an output frequency based on the received phase difference;
reconstructing a waveform by using the output frequency thereby forming a reconstructed waveform;
preprocessing the phase difference to generate a comparison waveform;
comparing the reconstructed waveform to the comparison waveform using a segment-by-segment multi-segment comparison; and
determining a gain nonlinearity based on the comparison between the reconstructed and comparison waveforms.
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