Offset local oscillator without using frequency divider

Details Offset local oscillator without using frequency divider Offset local oscillator without using frequency divider

2008-01-15

2008-01-15

Mis, David (Department: 2817)

Oscillators

Beat frequency

C331S046000, C331S1170FE, C331S1170FE, C455S318000

Reexamination Certificate

active

11409886

ABSTRACT:
A local oscillator without a frequency divider is provided. The local oscillator includes a quadrature voltage controlled oscillator generating I and Q signals having a frequency which is one-third of a local oscillation frequency, and a differential second-harmonic signal having a frequency which is two-thirds of the local oscillation frequency, a poly-phase filter converting the differential second-harmonic signal input from the quadrature voltage controlled oscillator into I and Q signals, and a single side band (SSB) mixer receiving the I and Q signals having the frequency which is one-third of the local oscillation frequency from the quadrature voltage controlled oscillator as an input and receiving the I and Q signals having the frequency which is two-thirds of the local oscillation frequency from the poly-phase filter as an input, and outputting the I and Q signals having the local oscillation frequency.

REFERENCES:
patent: 6836180 (2004-12-01), Kwok
H. Darabi et al., A 2.4-GHz CMOS Transceiver for Bluetooth,IEEE Journal of Solid-State Circuits, (Dec. 2001), p. 2016-2024, vol. 36, No. 12.
P. Zhang et al., A 5-GHz Direct-Conversion CMOS Transceiver,IEEE Journal of Solid-State Circuits, (Dec. 2003), p. 2232-2238, vol. 38, No. 12.
L. Perraud et al., A Direct-Conversion CMOS Transceiver for the 802.11 a/b/g WLAN Standard Utilizing a Cartesian Feedback Transmitter,IEEE Journal of Solid-State Circuits, (Dec. 2004), p. 2226-2238, vol. 39, No. 12.

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