31results about "Single resonant circuit with varying inductance and capacitance simultaneously" patented technology

An impedance tuning system, especially for a cellular telephone system. The system can be used to match the impedance of an antenna element with that of an output stage of a transmitter driving the antenna element. The system includes a piezo capacitor in parallel with the magnetostrictive inductor to form an LC circuit. A voltage controller applies a voltage bias signal to the piezo capacitor and a current controller applies a current bias signal to the inductor. A primary controller monitors the frequency of the output signal from the transmitter and controls the voltage and current controllers as needed to alter the impedance of the system as needed to match the impedance of the antenna element with that of the output stage of the transmitter. In an alternative form an ultrasonic sensor is provided.

An integrated electronic circuit comprises at least first and second variable resonator elements that can be tuned by means of an electric signal (Vtune) and that are arranged on the same silicon substrate, and that are respectively integrated into a Master circuit and a Slave circuit. Each resonator element is associated with a first inductive partner element set in the vicinity of the resonant and antiresonant frequencies; and with a second capacitive partner element, at least one of said partner elements being adjustable by means of said electric signal (Vtune). Controlling both partner elements could be done either by means of an adjustable capacitor, as a varactor, or by means of an inductor, passive or active, fixed or variable.

The present invention discloses a parameter tuning approach for bypass damping filter to suppress subsynchronous resonance in power systems, namely determining the parameters of capacitor, inductor and damping resistor in BDF. Using this approach, the parameters of capacitor and inductor in BDF can be adjusted, so that the frequency where the negative electrical damping of generator reaches minimum can be away from the frequency range of low frequency oscillation mode and typical frequencies of each torsional mode; the parameter of damping resistor in BDF can be further adjusted so that the minimum value of negative electrical damping is in reasonable range. The application of BDF with parameters tuned by the present invention contributes to the suppression of both the torsional interaction effect and the transient torque amplification effect.

The invention discloses a variable inductor, a voltage-controlled oscillator containing the variable inductor and a phase-locked loop, wherein the variable inductor includes a signal line arranged above a substrate. The variable inductor also includes: a first ground plane located above the substrate, the first ground plane disposed on the first side of the signal line; and a second ground plane disposed above the substrate, the second ground plane disposed on the signal line on the second side of the signal line opposite the first side of the line. The variable inductor further includes: a first floating plane located above the substrate, the first floating plane disposed between the first ground plane and the signal line; and a second floating plane located above the substrate, the second The floating plane is arranged between the second ground plane and the signal line. The variable inductor also includes an array of switches configured to selectively connect the first ground plane to the first floating plane, and selectively connect the second ground plane to the second floating plane.

In one embodiment, a tuning network includes: a controllable capacitance; a first switch coupled between the controllable capacitance and a reference voltage node; a second switch coupled between the controllable capacitance and a third switch; the third switch coupled between the second switch and a second voltage node; a fourth switch coupled between the second voltage node and a first inductor; the first inductor having a first terminal coupled to the fourth switch and a second terminal coupled to at least the second switch; and a second inductor having a first terminal coupled to the second terminal of the first inductor and a second terminal coupled to the controllable capacitance.

The invention belongs to the field of oscillation tuning and provides a tuned circuit and near-field payment equipment. By adopting the tuned circuit comprising multiple tuning modules, according to different switch choosing operations, tuning current is processed by one or more of the multiple tuning modules and transmitted to a resonance circuit, and resonance frequency of the tuning circuit is adjusted by cooperation of the processed turning current with a capacitor C1 and an inductor L1, so that the objective of reduction of tuning current leakage is achieved, the number of capacitors needed by the whole tuned circuit is decreased, the circuit size is further reduced, and circuit cost is lowered.

A system and method for a plunger assembly includes a tuning slug with a bore in the stem, a tuning screw rotatably disposed in the stem, and a coupling assembly to rotatably secure the tuning screw to the slug. The system and method may also include a locking assembly to secure the postion of the assembly.