Coarse and fine compensation for frequency error

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United States of America Patent

PATENT NO 11729040
APP PUB NO 20230097689A1
SERIAL NO

17484058

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Disclosed are techniques to compensate frequency systematic known error (FSKE) in reflector or initiator radios using a hybrid RF-digital approach in multi-carrier phase-based ranging. The hybrid RF-digital approach combines a coarse frequency compensation technique in the RF domain and a fine frequency compensation technique in the digital domain to remove the FSKE across all carrier frequencies from a device. The coarse frequency compensation performed in the RF domain may use a PLL to multiply the crystal frequency to arrive close to a target carrier frequency to compensate for a coarse portion of the known FSKE at the target frequency. The fine frequency compensation may use digital techniques to remove the remaining portion of the known FSKE not compensated by the RF. The hybrid approach reduces the number of fractional bits in the multiplier of the PLL when compared to an approach that uses only the RF-PLL to remove the FSKE.

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Patent Owner(s)

  • CYPRESS SEMICONDUCTOR CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Li, Yan Morganville, US 1330 19638
Uln, Kiran Pleasanton, US 57 209
Wihardja, James Tustin, US 10 9
Zand, Pouria Irvine, US 8 1

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