Oscillators – Solid state active element oscillator – Transistors
Reexamination Certificate
2008-05-20
2008-05-20
Kinkead, Arnold (Department: 2817)
Oscillators
Solid state active element oscillator
Transistors
C331S1170FE, C331S167000, C331S17700V, C331S016000, C331S03600C
Reexamination Certificate
active
11009495
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.
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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.
Barton Nathen
Hung Chih-Ming
Leipold Dirk
Brady W. James
Kinkead Arnold
Shaw Steven A.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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