Direct conversion turner

Details Direct conversion turner Direct conversion turner

2006-05-23

2006-05-23

Nguyen, Duc. M. (Department: 2685)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S302000, C455S307000, C455S326000, C455S340000, C455S063100, C455S067110, C455S067130, C455S067140, C455S226100

Reexamination Certificate

active

07050778

ABSTRACT:
A direct conversion tuner down-converts television signals, cable signals, or other signals directly from an RF frequency to an IF frequency and/or baseband, without an intermediate up-conversion step for image rejection. The direct conversion tuner includes a pre-select filter, an amplifier, an image reject mixer, and a poly-phase filter. The pre-select filter, amplifier, and the image reject mixer can be calibrated to provide sufficient image rejection to meet the NTSC requirements for TV signals. The entire direct conversion tuner can be fabricated on a single semiconductor substrate without requiring any off-chip components. The tuner configuration described herein is not limited to processing TV signals, and can be utilized to down-convert other RF signals to an IF frequency or baseband.

REFERENCES:
patent: 3641515 (1972-02-01), Sues
patent: 4006420 (1977-02-01), Schittko
patent: 4031469 (1977-06-01), Johnson
patent: 4340975 (1982-07-01), Onishi et al.
patent: 4368468 (1983-01-01), Lisle et al.
patent: 4696055 (1987-09-01), Marshall
patent: 4858159 (1989-08-01), Wheelwright et al.
patent: 5200826 (1993-04-01), Seong
patent: 5329319 (1994-07-01), Sgrignoli
patent: 5337014 (1994-08-01), Najle et al.
patent: 5390348 (1995-02-01), Magin et al.
patent: 5408196 (1995-04-01), Sempel et al.
patent: 5584068 (1996-12-01), Mohindra
patent: 5692279 (1997-12-01), Mang et al.
patent: 5737035 (1998-04-01), Rotzoll
patent: 5822687 (1998-10-01), Bickley et al.
patent: 5847612 (1998-12-01), Birleson
patent: 5930696 (1999-07-01), Tzuang et al.
patent: 5950119 (1999-09-01), McGeehan et al.
patent: 6009317 (1999-12-01), Wynn
patent: 6011962 (2000-01-01), Lindenmeier et al.
patent: 6028647 (2000-02-01), Fukai et al.
patent: 6035186 (2000-03-01), Moore et al.
patent: 6037999 (2000-03-01), Kunishima
patent: 6160572 (2000-12-01), Matsuura
patent: 6163684 (2000-12-01), Birleson
patent: 6169569 (2001-01-01), Widmer et al.
patent: 6233442 (2001-05-01), Koda et al.
patent: 6330290 (2001-12-01), Glas
patent: 6427068 (2002-07-01), Suominen
patent: 6484042 (2002-11-01), Loke
patent: 6952564 (2005-10-01), Gannholm
patent: 0208470 (1987-01-01), None
patent: 0473373 (1992-03-01), None
patent: 0576082 (1993-12-01), None
patent: 0883237 (1998-12-01), None
patent: WO 99/16179 (1999-04-01), None
Maier et al., “New High Density Multistandard RF-Concept For VCR”IEEE Transactions on Consumer Electronics, vol. 38, No. 3, Aug., 1992, pp. 389-393.
Copy of International Search Report issued Apr. 10, 2002 for PCT/US01/29027, 7 pages.
Tham, J. et al., “A Direct-Conversion Transceiver Chip Set for 900 MHZ (ISM Band) Spread-Spectrum Digital Cordless Telephone”IEEE Symposium on Circuits and Systems. vol. 4, May 12-15 1996, pp. 85-88.
Ducourant et al., “A 3 Chip G&As Double Conversion TV Tuner System With 70 dB Image Rejection,”IEEE 1989 Microwave and Millimeter-Wave Monolithic Circuits Symposium,pp. 87-90.
Farmer, “Specifications for Tuner Design for Use in Cable Ready Television Receivers and VCRs,”IEEE Transactions on Consumer Electronics,vol. 36, No. 3, Aug., 1990, pp. 660-668.
Maas, “Microwave Mixers,” Artech House, Copyright, 1986, pages 248-251.

Affiliated with

Also associated with

Rating

Direct conversion turner does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Direct conversion turner, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct conversion turner will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3547013