Telecommunications – Transmitter – Frequency conversion
Reexamination Certificate
2011-03-08
2011-03-08
Tran, Pablo N (Department: 2618)
Telecommunications
Transmitter
Frequency conversion
C455S102000, C455S196100, C455S209000, C455S258000, C455S316000, C330S010000
Reexamination Certificate
active
07904036
ABSTRACT:
A modulation circuit for use in a radiofrequency transmitter includes a local oscillator circuit configured to generate one or more local oscillator signals at a desired frequency and with a duty cycle at or about twenty-five percent, and a modulator configured to generate one or more modulated signals responsive to the one or more local oscillator signals and one or more baseband information signals. In at least one embodiment, the modulation circuit includes a modulator comprising a combined mixing and transconductance circuit that includes a transistor circuit for each baseband information signal serving as a modulation input to the modulator. Each transistor circuit comprises a first transistor driven by the baseband information signal and coupling a modulator output node to a corresponding transconductance element, and a second transistor driven by one of the one or more local oscillator signals and coupling the corresponding transconductance element to a signal ground node.
REFERENCES:
patent: 4412141 (1983-10-01), Jacobsen
patent: 5838210 (1998-11-01), Midya et al.
patent: 5894592 (1999-04-01), Brueske et al.
patent: 6205325 (2001-03-01), Groe
patent: 6300845 (2001-10-01), Zou
patent: 6385439 (2002-05-01), Hellberg
patent: 6711397 (2004-03-01), Petrov et al.
patent: 6763227 (2004-07-01), Kramer
patent: 6778117 (2004-08-01), Johnson
patent: 6806693 (2004-10-01), Bron
patent: 6865382 (2005-03-01), Behzad
patent: 6937849 (2005-08-01), Kluge et al.
patent: 7062248 (2006-06-01), Kuiri
patent: 7088980 (2006-08-01), Otaka
patent: 7088982 (2006-08-01), Chien
patent: 7177620 (2007-02-01), Tsai et al.
patent: 7263344 (2007-08-01), Manku
patent: 7266357 (2007-09-01), Behzad
patent: 7274253 (2007-09-01), Pan
patent: 7392026 (2008-06-01), Alam et al.
patent: 7425995 (2008-09-01), Johnson
patent: 7457606 (2008-11-01), Kim
patent: 2001/0016016 (2001-08-01), Eidson et al.
patent: 2003/0007377 (2003-01-01), Otaka
patent: 2003/0087614 (2003-05-01), Kramer
patent: 2003/0117222 (2003-06-01), Anderson
patent: 2005/0239430 (2005-10-01), Shah
patent: 2007/0042728 (2007-02-01), Pan
patent: 2007/0087711 (2007-04-01), Pan
patent: 2008/0007339 (2008-01-01), Pan
patent: 0276130 (1988-07-01), None
patent: 0896424 (1999-02-01), None
patent: 0909052 (1999-04-01), None
Klumperink, E. A. M., “A CMOS Switched Transconductor Mixer”. IEEE Journal of Solid—State Circuits. Aug. 2004. 1231-1240. vol. 39; No. 8.
Mattisson Sven
Nilsson Magnus
Coats & Bennett P.L.L.C.
Telefonaktiebolaget LM Ericsson (publ)
Tran Pablo N
LandOfFree
Modulation method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Modulation method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modulation method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2695919