Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion
Patent
1996-09-13
1999-08-10
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency modifying or conversion
455207, 375324, H04B 126
Patent
active
059373415
ABSTRACT:
An RF tuner and tuning method employs analog quadrature mixing with a coarse-stepwise tunable local oscillator to a near-baseband passband region, followed by A/D conversion of the I and Q signals, correction of phase, group delay, and amplitude errors, image rejection, and translation to baseband by (1) fixed frequency translation, (2) stepwise channelized translation, or (3) essentially continuously variable tuning over a given digital tuning range. The near-baseband passband region is sized and located such that alternating image rejection provides non-redundant and complete tuning coverage of a desired high frequency spectrum with a local oscillator step size equal to about twice the digital tuning range or about twice the number of channels digitally stepwise tunable times the channel width, effectively doubling the typical local oscillator step size. The digital tuning is preferably performed by a continuously variable bandpass decimating filter with aliasing to within R.sub.D of baseband, where R.sub.D is the filter's out put sampling rate, followed by fine-shifting to baseband by digital complex mixing. Demodulation is then accomplished according to signal type.
Image rejection and phase error and gain correction are preferably performed with a modified type III Hilbert transform pair with 90.degree..+-.CF phase change and variable gain. The near-baseband passband is preferably centered at R/4 where R is the sampling rate entering the Hilbert transform.
REFERENCES:
patent: 4241451 (1980-12-01), Maixner et al.
patent: 4675882 (1987-06-01), Lillie et al.
patent: 4737728 (1988-04-01), Nakamura et al.
patent: 4803700 (1989-02-01), Dewey et al.
patent: 4864643 (1989-09-01), French et al.
patent: 4884265 (1989-11-01), Schroeder et al.
patent: 4944025 (1990-07-01), Gehring et al.
patent: 4965853 (1990-10-01), Barnard
patent: 4994769 (1991-02-01), Kishi
patent: 5003621 (1991-03-01), Guilus
patent: 5125008 (1992-06-01), Trawick et al.
patent: 5142553 (1992-08-01), Rosenkranz
patent: 5230099 (1993-07-01), Loper
patent: 5249203 (1993-09-01), Loper
patent: 5375146 (1994-12-01), Chalmers
patent: 5402449 (1995-03-01), Schultes et al.
patent: 5548244 (1996-08-01), Clewer
patent: 5640698 (1997-06-01), Shen et al.
patent: 5761615 (1998-06-01), Jaffee
patent: 5784414 (1998-07-01), Bruekers et al.
patent: 5802463 (1998-09-01), Zuckerman
patent: 5826180 (1998-10-01), Golan
patent: 5828955 (1998-10-01), Lipowski et al.
Crols, Jan et al., A Single-Chip 900 MHz CMOS Receiver Front-End with a High Performance Low-IF Topology, IEEE Journal of Solid-State Circuits, vol. 30, No. 12, Dec. 1995, pp. 1483-14923.
Paez-Borrallo, JoseM. ; Casaju Quiroos, Francisco J.; Zazo, Santiago, Self Calibrating Low IF Digital Image Rejection Receiver For Mobile Communications, (believed presented at conference Sep. 10, 1996.).
Casaju Quiros, Francisco J. and Paez Borrallo, Jose M. ; A Low IF Image Rejection Receiver For DECT, RACE Mobile Telecommunications Summit, Cascais, Portugal, Nov. 22-24, 1995, vol. 1.
Patent N. 0 595 277 A1 Translation.
Larson, Lawrence E., RF and Microwave Circuit Design for Wireless Communications, Artech House, Boston, pp. 52-55 (Excerpt from Chapter by Asad A. Abidi, UCLA), Feb. 1996.
Fernandez-Duran, Alfonso, et al., Alcatel, Zero-IF Receiver Architecture for Multistandard Compatible Radio Systems, 46th IEEE Vehicular Technology Conference, May 1996, pp. 1052-1056.
Oscarsson, Fredrik; Lindblad, Arne; National Defence Research Establishment, Sweden, Wideband HF Receiver With Digital Quadrature Splitting, 1993, pp. 1267-1271.
Phillips Semiconductors, Specification Sheet, Image Rejecting Front-end for GSM Applications. UAA207M, Nov. 1996.
Wuorinen, John H., A Fully Integrated 900 MHz CMOS Double Quadrature Downconverter, 1995 IEEE International Solid-State Circuits Conference, Digest of Technical Papers, Castine, ME, First Edition, Feb. 1995, pp. 137-138.
Gray, P. R., et al., Future Directions in Silicon ICs for RF Personal Communications, Proceeding of the IEEE 1995 Custom Integrated Circuits Conference, Berkeley, CA, May 1-4, 1995, pp. 83-90.
Hawley, Robert A., et al., A 300 MHz Digital Double-Sideband to Single-Sideband Converter in 1 .mu.m CMOS, IEEE Journal of Solid-State Circuits, vol. 30, No. 1, Jan. 1995.
Min, Jonathan, et al., An All-CMOS Architecture for a Low-Power Frequency-Hopped 900 MHz Spread Spectrum Transceiver, IEEE 1994 Custom Integrated Circuits Conference, Los Angeles, CA, pp. 379-382.
Bhattacharya Sam
Eisenzopf Reinhard J.
University of Washington
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