30results 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.

An acoustic resonator circuit to be integrated into a semiconductor product including: a resonator comprising first and second resonant frequencies; an inductive resistor tuned to said second resonant frequency so as to cancel the latter and to allow tuning of the resonator to said first resonant frequency; an tunable capacitive tuning element allowing to tune the resonator to said first frequency. A method is also provided for manufacturing an integrated circuit comprising an acoustic component allowing sufficient control of resonator characteristics.

An amplifier arrangement for ultra-wideband, UWB, applications and. a method to amplify a UWB signal are presented. A transistor, whose control input forms an input of the arrangement, is connected to a resonant circuit having a controllable resonator frequency. At the resonator circuit, an output of the arrangement is formed. The resonant circuit includes a frequency determining inductance whose value is controllable. By doing this, it is possible to preselect different frequency bands, while achieving the same gain characteristics in each band.

A system, apparatus and / or method provides frequency response adjustment of an RF input filter (208) of an RF tuner (40) based on impedance of an antenna system (24) that is providing reception of RF signals to the RF tuner. The frequency response adjustment is preferably accomplished dynamically and / or with respect to each frequency tuned. Particularly, the system, method and / or apparatus provides compensation at the RF tuner level for mistuning effects produced on the RF tuner (40) by antenna system impedance (29) presented at the antenna input (30) that is other than a designed for impedance. Frequency response of an RF input filter (208, 216) for the RF tuner (40) is electronically adjustable with an independent or semi-independent control voltage signal based on one or more measured parameters of a tuning frequency. Frequency response adjustment may include adjustment of a center frequency of the RF input filter bandpass frequency range and / or altering the bandpass frequency range of the RF input filter. The subject invention expands the capability of an RF signal receiver, particularly one using at least one electronically adjustable RF filter at the input of an electronic alignment type tuner.

Disclosed is a variable inductance applying device using a variable capacitor, and a variable frequency generating device thereof. The variable inductance applying device includes: a first inductor whose both terminals are connected to an inductance applying terminal applying inductance to an external circuit; a second inductor inductively coupled to the first inductor; and a variable capacitor connected to both terminals of the second inductor, which varies inductance from the inductance applying terminal by changing capacitance. Therefore, the inductance to be applied to the external circuit can be varied by changing the capacitance of the variable capacitor. Since the variable capacitor rarely contains a resistance component, energy loss due to the resistance component hardly occurs. As a result, the variable inductance applying device has a high value of Q.

An Inductive Power Transfer System pickup provides a controlled AC power supply by controlled variation of the phase angle between the pickup coil induced voltage (jwMI) and the tuning capacitor C voltage. The phase angle can be varied by maintaining the tuning capacitor C voltage substantially constant for a selected time period. Switches S1 and S2 may be used to clamp the tuning capacitor C voltage at substantially zero volts during the selected time period. Switch S1 can be operated to prevent a rise in positive voltage across the tuning capacitor, and switch S2 can be used to prevent the voltage across the tuning capacitor from going negative.

A system, apparatus and / or method provides frequency response adjustment of an RF input filter of an RF tuner based on impedance of an antenna system that is providing reception of RF signals to the RF tuner. The frequency response adjustment is preferably accomplished dynamically and / or with respect to each frequency tuned. Particularly, the system, method and / or apparatus provides compensation at the RF tuner level for mistuning effects produced on the RF tuner by antenna system impedance presented at the antenna input that is other than a designed for impedance. Frequency response of an RF input filter for the RF tuner is electronically adjustable with an independent or semi-independent control voltage signal based on one or more measured parameters of a tuning frequency. Frequency response adjustment may include adjustment of a center frequency of the RF input filter bandpass frequency range and / or altering the bandpass frequency range of the RF input filter. The subject invention expands the capability of an RF signal receiver, particularly one using at least one electronically adjustable RF filter at the input of an electronic alignment type tuner.

A calibration device (CD) is dedicated to a RF band-pass filter (RFF) comprising a means (FM) for filtering a frequency band depending on the value of a control voltage applied by a controllable power supply means (PSM). This device (CD) comprises i) a generator (GM) for feeding the filter means (FM) with a test signal of a chosen frequency, ii) a means (MM) arranged to measure the output power values of the test signal at the filter means output, and iii) a control means (CM) arranged a) to order the power supply means (PSM) to apply successive increasing control voltages as long as the output power value increases, reaches a maximum value and then begins to decrease, then b) to store the first decreasing output power value and the corresponding control voltage, then c) to order the power supply means (PSM); to apply successive decreasing control voltages as long as the output power value increases, reaches said maximum value and then begins to decrease to a last output power value, and then d) to determine a control voltage corresponding to a maximum of the filter output power at the chosen frequency from the stored control voltage and the control voltage applied last and corresponding to the last output power value.

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.

An RF bandpass filter includes a cascaded series of a first subfilter and a second subfilter. Each subfilter includes a respective inverter, voltage-controlled capacitor and inductor. A first selected one of the first subfilter and the second subfilter is a pseudo low pass filter and a second selected one of the first subfilter and the second subfilter is a pseudo high pass filter. The RF bandpass filter is configured to separately control a bandwidth and center frequency of output RF energy. The bandwidth may be controlled to be substantially fixed over a significant substantial range. The center frequency and bandwidth are controlled by adjusting a voltage input to one or more of the voltage-controlled capacitors.

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.

The present invention provides a central frequency adjustment device and adjustable inductor layout; wherein, the central frequency adjustment device is applied in an inductor / capacitor tank (LC tank) for adjusting the central frequency of the LC tank. The device comprises a first inductor with a first end and a second end; a second inductor with one end coupled with the second end of the first inductor; and, a first trimmable wire connected to the first inductor in parallel and to the second inductor in series, which adjusts the central frequency by cutting off the first trimmable wire.

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.

A calibration device (CD) is dedicated to a RF band-pass filter (RFF) comprising a means (FM) for filtering a frequency band depending on the value of a control voltage applied by a controllable power supply means (PSM). This device (CD) comprises i) a generator (GM) for feeding the filter means (FM) with a test signal of a chosen frequency, ii) a means (MM) arranged to measure the output power values of the test signal at the filter means output, and iii) a control means (CM) arranged a) to order the power supply means (PSM) to apply successive increasing control voltages as long as the output power value increases, reaches a maximum value and then begins to decrease, then b) to store the first decreasing output power value and the corresponding control voltage, then c) to order the power supply means (PSM); to apply successive decreasing control voltages as long as the output power value increases, reaches said maximum value and then begins to decrease to a last output power value, and then d) to determine a control voltage corresponding to a maximum of the filter output power at the chosen frequency from the stored control voltage and the control voltage applied last and corresponding to the last output power value.

A multi-frequency tuning circuit includes a first branch including a first inductor and a first capacitor arranged in series and a second branch including a second inductor and a second capacitor arranged in series. The circuit is arranged within a circuitry module configured to be positioned between a source and a load, the first branch and the second branch both associated with loads, from the source, having low impedance frequencies. In order to improve transmitter antenna output power for downhole tools, the tuning circuit creates high impedance at operating frequencies between frequencies corresponding to low impedance.