Multi-Band VCO Circuit With Coupled Inductors and Synchronous Switching

The patent merges multiple voltage controlled oscillators into a single integrated circuit by sharing common components (cross-coupled pair circuit, capacitive circuits, inductors) among different oscillators. This allows multi-band frequency coverage to be achieved without proportionally increasing the circuit area, as the same physical components serve multiple frequency bands through different configuration states.

The patent employs switchable capacitive circuits with variable capacitance values that can be dynamically adjusted through control voltages. By changing the capacitance values in real-time, the oscillator can switch between different frequency bands, enabling adaptability without requiring separate fixed-frequency oscillator circuits for each band.

The patent designs a universal voltage controlled oscillator architecture where a single cross-coupled pair circuit and set of passive components can generate multiple frequency bands. The same core oscillator circuit is configured for different bands by switching capacitive values, eliminating the need for separate dedicated oscillator circuits for each frequency band and reducing overall device complexity.

The patent segments the frequency control function into independent switchable capacitive circuits that can be individually controlled. This segmentation allows each capacitor to be adjusted independently to achieve different frequency combinations, providing versatile frequency control while maintaining a relatively simple overall circuit structure through modular design.