Oscillators – Plural oscillators – Adjustable frequency
Reexamination Certificate
2011-06-14
2011-06-14
Mis, David (Department: 2817)
Oscillators
Plural oscillators
Adjustable frequency
C331S055000, C331S1170FE, C331S173000, C331S17700V, C455S256000
Reexamination Certificate
active
07961056
ABSTRACT:
Embodiments of the present invention include a low phase noise oscillator circuit using a current-reuse technique to reduce power consumption and improve phase noise, where the oscillator circuit comprises a first VCO coupled to a second VCO, and the outputs of the first and second VCOs are coupled with passive elements, such as capacitors. The overall power consumption of both the first and second VCOs is about the same as a single VCO. Furthermore, the phase noise is lowered by around 3 dB. Thus, the phase noise performance is improved without increasing the power consumption of the oscillator circuit.
REFERENCES:
patent: 7199675 (2007-04-01), Lee et al.
patent: 2009/104839 (2009-08-01), None
patent: 2011/031389 (2011-03-01), None
Park et al., “Current Reusing VCO and Divide-by-Two Frequency Divider for Q uadrature LO Generation”, IEEE Microwave and Wireless Components Letters ; vol. 18(6), (Jun. 2008),pp. 413-415. Abstract Only.
Oh et al., “Current Reused LC VCOs”, IEEE Microwave and Wireless Com Ponents Letters ; vol. 15(11), See abstract, figures 1,3 and corresponding detai led description.,(Nov. 2005),pp. 736-738. Abstract Only.
Lee et al., “A Low Power Injection Locked LC-Tank Oscillator With Current Reused Topology”, IEEE Microwave and Wireless Components Letters, vol. 17(3), (Mar. 2007),pp. 220-222. Abstract Only.
Hsieh et al., “Design of Ultra-Low-Voltage RF Frontends With Complementary Current-Reused Architectures”, IEEE Transactions on Microwave Theory and Techniques, vol. 55(7), (Jul. 2007), pp. 1445-1458. Abstract Only.
International Search Report and Written Opinion received for PCT Application No. PCT/US2010/044100, mailed on Mar. 30, 2011,10 pgs.
Ghosh Diptendu
Taylor Stewart S.
Intel Corporation
Mis David
Thorpe North & Western LLP
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