Modulators – Frequency shift keying modulator or minimum shift keying...
Reexamination Certificate
2006-07-24
2010-06-22
Pascal, Robert (Department: 2817)
Modulators
Frequency shift keying modulator or minimum shift keying...
C375S135000, C375S307000
Reexamination Certificate
active
07741926
ABSTRACT:
A frequency synthesizer switches the frequency at a high rate, is of low power consumption, and has a high signal-to-noise ratio. CMOS quadrature VCOs31, 32generate and output four-phase signals36, 37, respectively. CMOS selector33selects either one of two four-phase signals36, 37generated by CMOS quadrature VCOs31, 32and outputs the selected signal as output signal38. CMOS SSB mixer34multiplies output signal38selected by CMOS selector33and four-phase input signal39input from an external source by each other to generate a signal having a frequency represented by the sum of, or the difference between, the frequency of output signal38and the frequency of four-phase input signal39, and outputs the generated signal as output signal40. CML buffer35adjusts the level of output signal40from CMOS SSB mixer34and outputs the level-adjusted signal to another circuit.
REFERENCES:
patent: 6268778 (2001-07-01), Mucke et al.
patent: 6995619 (2006-02-01), Cho
patent: 2005/0255822 (2005-11-01), Friedrich et al.
patent: 2001-077632 (2001-03-01), None
patent: 2001-273048 (2001-10-01), None
patent: 2002-163034 (2002-06-01), None
patent: 2002232314 (2002-08-01), None
patent: 2003-198329 (2003-07-01), None
patent: 2003-258666 (2003-09-01), None
patent: 2005-051732 (2005-02-01), None
patent: 2005-175698 (2005-06-01), None
D. Leenaerts et al., “A SiGe BiCMOS 1ns Fast Hopping Frequency Synthesizer for UWB Radio”, Solid-State Circuits Conference, Digest of Technical Papers, ISSCC, IEEE International, Feb. 10, 2005, pp. 202, 203 and 593.
C. Sandner et al., “A 3GHz to 7GHz Fast-Hopping Frequency Synthesizer for UWB”, International Workshop on UWB Technologies, May 21, 2004, pp. 405-409.
K. Yamaguchi et al., “A 2.5-GHz Four-Phase Clock Generator With Scalable No-Feedback-Loop Architecture”, IEEE Journal of Solid-State Circuits, vol. 36, No. 11, Nov. 2001, pp. 1666-1672.
A. Hajimiri et al., “Design Issues in CMOS Differential LC Oscillators”, IEEE Journal of Solid-State Circuits, vol. 34, No. 5, May 1999, pp. 717-724.
International Search Report of PCT/JP2006/314553 filed Jul. 24, 2006, date of mailing Oct. 24, 2006.
Kodama Hiroshi
Tanaka Akio
Johnson Ryan
NEC Corporation
Pascal Robert
Young & Thompson
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