System and method for increasing radio frequency...

Oscillators – Solid state active element oscillator – Transistors

Reexamination Certificate

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C331S1170FE, C331S167000, C331S17700V, C331S016000, C331S03600C

Reexamination Certificate

active

07375598

ABSTRACT:
System and method for increasing the frequency tuning range of a RF/microwave LC oscillator. A preferred embodiment comprises a voltage controlled oscillator (VCO) configured to generate an output signal at a frequency that is dependent upon a magnitude of an input voltage level and an effective inductance of an inductive load and a variable inductor coupled to the VCO. The variable inductor comprises a primary inductor coupled to the VCO to produce a magnetic field based upon a current flowing through the primary inductor and a secondary inductor magnetically coupled to the primary inductor, the secondary inductor to affect the magnitude of the effective inductance of the primary inductor.

REFERENCES:
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patent: 6870457 (2005-03-01), Chen et al.
patent: 2003/0042571 (2003-03-01), Chen et al.
patent: 2004/0196110 (2004-10-01), Boccuzzi et al.
Kral, A., et al., “RF-CMOS Oscillators with Switched Tuning,” IEEE 1998 Custom Integrated Circuits Conference, 1998, pp. 555-558, IEEE, Los Alamitos, CA.
Väänänen, P., et al., “A 3.6 GHz Double Cross-Coupled Multivibrator VCO with 1.6-GHZ Tuning,” IEEE Transactions on Circuits and Systems—II: Analog and Digital Signal Processing, Aug. 2001, pp. 799-802, vol. 48, No. 8, IEEE, Los Alamitos, CA.
Yim, S-M., et al., “Demonstration of a Switched Resonator Concept in a Dual-Band Monolithic CMOS LC-Tuned VCO,” IEEE 2001 Custom Integrated Circuits Conference, 2001, pp. 205-208, IEEE, Los Alamitos, CA.

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