A system for split-frequency amplification, preferably including: one or more primary-band amplification stages, one or more secondary-band amplification stages, one or more band-splitting filters, and/or one or more signal couplers. An analog canceller including one or more split-frequency amplifiers. A mixer including one or more split-frequency amplifiers. A voltage-controlled oscillator including one or more split-frequency amplifiers. A method for split-frequency amplification, preferably including: receiving an input signal, separating the input signal into signal portions, and/or amplifying the signal portions, and optionally including combining the amplified signal portions and/or providing one or more output signals.

A variable-gain power amplifying technique includes generating, with a network of one or more reactive components included in an oscillator, a first oscillating signal, and outputting, via one or more taps included in the network of the reactive components, a second oscillating signal. The second oscillating signal has a magnitude that is proportional to and less than the first oscillating signal. The power amplifying technique further includes selecting one of the first and second oscillating signals to use for generating a power-amplified output signal, and amplifying the selected one of the first and second oscillating signals to generate the power-amplified output signal.

A system includes a power receiver including an oscillator with a first coil and a second coil. The oscillator includes a first field effect transistor (FET) having first gate, first source, and first drain terminals, the first drain terminal coupled to the first coil, the first coil adapted to be inductively coupled to a third coil in a power transmitter. The oscillator also includes a first capacitor coupled to the first coil. The oscillator includes a second FET having second gate, second source, and second drain terminals, the second gate terminal coupled to the first capacitor, the second source terminal coupled to the first source terminal, and the second drain terminal coupled to the second coil, the second coil adapted to be inductively coupled to a fourth coil in the power transmitter. The oscillator includes a second capacitor coupled to the first gate terminal and coupled to the second coil.

An integrated circuit may include oscillator circuitry having a resonator formed from fin field-effect transistor (FinFET) devices. The resonator may include drive cells of alternating polarities and sense cells interposed between the drive cells. The resonator may be connected in a feedback loop within the oscillator circuitry. The oscillator circuitry may include an amplifier having an input coupled to the sense cells and an output coupled to the drive cells. The oscillator circuitry may also include a separate inductor and capacitor based oscillator, where the resonator serves as a separate output filter stage for the inductor and capacitor based oscillator.

A position sensing circuit that can be used with a position control device including a differential sensing coil unit having a first sensing coil and a second sensing coil disposed to face a conductor disposed on one side of a lens barrel. The position sensing circuit includes: a differential oscillation circuit generating a first oscillation signal having a first amplitude based on a first inductance of the first sensing coil, variable according to positional movement of the conductor, and a second oscillation signal having a second amplitude based on a second inductance of the second sensing coil, variable according to positional movement of the conductor; an amplitude detection circuit detecting the first amplitude of the first oscillation signal and the second amplitude of the second oscillation signal; and a signal processing circuit calculating the first amplitude and the second amplitude to calculate a position value.

A band-pass filter (BPF) includes a pair of coupled transformers including first through fourth conductive structures. The first conductive structure includes a first terminal and two first extending portions extending from the first terminal and configured as primary windings. The second conductive structure includes a second terminal and two second extending portions extending from the second terminal. A first via connects the third conductive structure to a first one of the two second extending portions, the third conductive structure and the first one of the two second extending portions thereby being configured as a first secondary winding. A second via connects the fourth conductive structure to a second one of the two second extending portions, the fourth conductive structure and the second one of the two second extending portions thereby being configured as a second secondary winding.

The present invention provides an oscillator including a tapped inductor and a cross-coupled pair. The tapped inductor includes a first terminal, a second terminal, a first tap and a second tap. The cross-coupled pair receives two input signals from the first terminal and the second terminal to generate two output signals to the first tap and the second tap, respectively.

A voltage controlled oscillator includes a resonator and an amplifier. The resonator includes a capacitive element and an inductive element. The inductive element has a plurality of conductive segments forming a physical loop. The inductive element has electrical connections on the physical loop to the plurality of conductive segments forming at least one electrical loop disposed within an interior space formed by the physical loop. The amplifier has an input and an output, the input coupled to a first conductive segment forming a first impedance and the output coupled to a second conductive segment forming a second impedance.

Example oscillators and oscillator-based apparatus are described. One example oscillator includes: a resonant circuit, configured to generate an oscillator signal; a first cross-coupled transistor, coupled to the resonant circuit; and a power supply circuit, configured to supply a power supply signal for the first cross-coupled transistor based on a first voltage and a second voltage, where the first voltage is a power supply voltage, and the second voltage is a voltage generated by an external sensing circuit. Because an oscillation frequency of the oscillator changes with the power supply signal of the oscillator, the oscillation frequency of the oscillator can be compensated by adjusting the power supply signal.

A phased-locked loop (PLL) circuit with an injection locked digital digitally controlled oscillator (ILD) that has an ILD control input element, an ILD injection input element and an ILD output element. The PLL circuit also includes an adaptive control unit (ACU), wherein the ACU is configured to receive an error signal and is configured to output an ILD control word. The ILD control input element is configured to receive the ILD control word, and the ILD control word may set a natural oscillation frequency of the ILD. The ILD is further configured to output a first output signal from the ILD output element, where the natural oscillation frequency may set a frequency of the first output signal.