Gain calibration of a digital controlled oscillator

Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements

Reexamination Certificate

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C331S014000, C331S017000, C331S025000, C327S159000, C332S127000, C375S376000

Reexamination Certificate

active

11149859

ABSTRACT:
A novel apparatus for and a method of estimating, calibrating and tracking in real-time the gain of a radio frequency (RF) digitally controlled oscillator (DCO) in an all-digital phase locked loop (ADPLL). Precise setting of the inverse DCO gain in the ADPLL modulating path allows direct wideband frequency modulation that is independent of the ADPLL loop bandwidth. The gain calibration technique is based on a steepest descent iterative algorithm wherein the phase ADPLL error is sampled and correlated with the modulating data to generate a gradient. The gradient is then scaled and added to the current value of the DCO gain multiplier.

REFERENCES:
patent: 7046098 (2006-05-01), Staszewski
“A 2.5-Mb/s GFSK 5.0-Mb/s 4-FSK Automatically Calibrated Σ-Δ Frequency Synthesizer”, Daniel R. McMahill and Charles G. Sodini, IEEE Journal of Solid-State Circuits, vol. 37, No. 1, Jan. 2002, pp. 18-26.
“All-Digital Phase-Domain TX Frequency Synthesizer for Bluetooth Radios in 0.13μm CMOS”, Robert B. Staszewski, et al., IEEE International Solid-State Circuits Conference, Session 15, Wireless Consumer ICs 15.3, Jun. 2004, pp. 1-10.
“All Digital PLL and GSM/EDGE Transmitter in 90nm CMOS”, IEEE International Solid State Circuits Conference, Session 17, RF Cellular ICs, 17.5, 2005, pp. 316-317 Figure 17.5.7: Die Micrograph.
“Automatic Calibration of Modulated Frequency Synthesizers”, IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 29, No. 5, May 2002, pp. 301-311.
“Just-In-Time Gain Estimation of an RF Digitally-Controlled Oscillator”, Robert B. Staszewski, et al., IEEE Custom Integrated Circuits Conference, Proc of May 2003, pp. 571-574.
“Just-In-Time Gain Estimation of an RF Digitally-Controlled Oscillator for Digital Direct Frequency Modulation”, Robert B. Staszewki et al., IEEE Transactions on Circuits and Systems-II: Analog and Digital Signal Processing, vol. 50, No. 11, Nov. 2003, pp. 887-892.
“Phase-Domain All-Digital Phase-Locked Loop”, Robert B. Staszewski, et al., IEEE Transactions on Circuits and Systems-II: Express Briefs, vol. 52, No. 3, Mar. 2005, pp. 159-163.

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