Directly sampling radio frequency signals

Details Directly sampling radio frequency signals Directly sampling radio frequency signals

2007-08-06

2009-06-09

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C375S321000, C329S304000, C455S334000

Reexamination Certificate

active

07545306

ABSTRACT:
The present disclosure is directed to a system and method for directly sampling RF signals. In some implementations, an RF reader includes a clock generator and an Analog-to-Digital Converter (ADC). The clock generator is configured to generate a sample clock signal based, at least in part, on an input signal associated with transmitting RF signals. The ADC is configured to directly sample RF signals in a receive path of the reader using the sample clock signal to generate a digital signal. Mixing of the RF signal and the sample clock, through the sampling process in the ADC, reduces phase noise associated with the transmission signal in the receive path.

REFERENCES:
patent: 4436425 (1984-03-01), Cole
patent: 5301206 (1994-04-01), Ishigaki et al.
patent: 5862139 (1999-01-01), Yanagi
patent: 5889759 (1999-03-01), McGibney
patent: 5901347 (1999-05-01), Chambers et al.
patent: 6067329 (2000-05-01), Kato et al.
patent: 6108529 (2000-08-01), Vice et al.
patent: 6522684 (2003-02-01), Okubo et al.
patent: 6654595 (2003-11-01), Dexter
patent: 6836457 (2004-12-01), Nakamura et al.
patent: 7023947 (2006-04-01), Kobayashi et al.
patent: 2006/0111074 (2006-05-01), Petilli et al.
Ulrich Rhode:Digital PLL Frequency Synthesizers: Theory and Design, Prentice-Hall, 1993.
John J. Podesta, “Phase Noise Cancellation in a Mixer Circuit: Analysis Using a Random Phase Function”, Technical Report ARFSD-TR-95016 (48 pages).
Robert B. Staszewski, Chan Fernando, and Poras T. Balsara, “Event-Driven Simulation and Modeling o Phase Noise of an RF Oscillator”, IEEE Transactions on Circuits and Systems, Apr. 2005 (11 pages).
ITU-T Recommendation G.810 (Aug. 1996) “Definitions and Terminology for Synchronization Networks” (29 pages).
D.B. Leeson, “A Simple Model of Feedback Oscillator Noise Spectrum”, Proceedings Letters, 1966 (2 pages).
Thomas H. Lee and Ali Hajimiri, “Oscillator Phase Noise: A Tutorial”, IEEE Journal of Sold-State Circuits, Mar. 2000 (11 pages).

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