Telecommunications – Receiver or analog modulated signal frequency converter
Reexamination Certificate
2008-09-02
2008-09-02
Nguyen, Simon (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
C455S315000, C455S323000
Reexamination Certificate
active
10825655
ABSTRACT:
An RF mixer includes a plurality of submixers coupled to a single input transistor pair and a single tail current source. An input LO signal is divided into multiple individual waveforms, each having a different phase. The phase differences are even in that the phase difference between any two time-adjacent individual waveforms is approximately equal to the phase difference between any other two time-adjacent individual waveforms. The submixers are appropriately scaled so that the individual waveforms, when summed, create a piecewise linear LO signal. The submixers also combine the individual waveforms with an input baseband signal to produce an output signal or to produce a baseband signal from an input mixed signal. In order to reduce noise in the system, only one submixer is active at any time. Further, polarities of some individual waveforms are reversed so that to avoid signal cancellation when by combining waveforms of opposite polarities.
REFERENCES:
patent: 5708399 (1998-01-01), Fujii et al.
patent: 6140849 (2000-10-01), Trask
patent: 6628343 (2003-09-01), Yamaguchi et al.
patent: 6782247 (2004-08-01), Nilson et al.
patent: 6947513 (2005-09-01), O'Toole et al.
patent: 7027792 (2006-04-01), Luff et al.
patent: 7088981 (2006-08-01), Chang
patent: 7130604 (2006-10-01), Wong et al.
patent: 2001/0041548 (2001-11-01), Bult et al.
patent: 2002/0004376 (2002-01-01), Lee et al.
patent: 2002/0193089 (2002-12-01), Hatcher et al.
patent: 2003/0007377 (2003-01-01), Otaka
patent: 2003/0119474 (2003-06-01), Kimura
patent: 2003/0176177 (2003-09-01), Molnar et al.
patent: 2004/0166799 (2004-08-01), Kral
patent: 2004/0214547 (2004-10-01), Kim et al.
patent: 2005/0024544 (2005-02-01), Waight et al.
patent: 2005/0186930 (2005-08-01), Rofougaran et al.
patent: 2005/0206416 (2005-09-01), Kizer
patent: 2005/0239430 (2005-10-01), Shah
patent: 2006/0003727 (2006-01-01), Litwin et al.
patent: 2006/0148440 (2006-07-01), Bargroff
patent: 2006/0154625 (2006-07-01), Malone et al.
Jeffrey A. Weldon et al., “A 1.75-GHz Highly Integrated Narrow-Band CMOS Transmitter with Harmonic-Rejection Mixers,” IEEE Journal of Solid State Circuits, vol. 36, No. 12, Dec. 2001, pp. 2003-2015.
Gomez Ramon A.
Hayashi Takayuki
Broadcom Corporation
Nguyen Simon
Sterne Kessler Goldstein & Fox P.L.L.C.
LandOfFree
RF mixer with high local oscillator linearity using multiple... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with RF mixer with high local oscillator linearity using multiple..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RF mixer with high local oscillator linearity using multiple... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3943299