163results about "Tunable filters" patented technology

An electronic decoder for decoding of block coded wireless communications signals. The electronic decoder comprises at least two electrically interconnected analogue crossbar arrays (1110, 1120) of memristors. An electrical interconnection (1115) between a column (1111) of an analogue crossbar array of the at least two electrically 5 interconnected analogue crossbar arrays (1110, 1120) and a row (1121) of a following analogue crossbar array of the at least two electrically interconnected analogue crossbar arrays (1110, 1120) comprises a current-to-voltage converter (1101). A first analogue crossbar array (1110) of the at least two analogue crossbar arrays (1110, 1120) comprises at least a first row of memristors (1112a) with a single input and a 10 respective output for each column of memristors.

An impedance matching network for a radio frequency (RF) transmission system can include first port for coupling to a first transistor differential pair. The network can further include a second port for coupling to a second transistor differential pair. The network can further include a matching network connected to the first port and the second port, the matching network comprised of a pair of coupled lines. Other aspects are described.

An adaptive electronic filter (200) comprising a memristive-based filter circuit (201) for filtering an electrical input signal to obtain a filtered electrical signal. The adaptive electronic filter (200) further comprises a memristive-based subtractor circuit (202) for obtaining an error signal based on the filtered electrical signal and a reference signal and an error minimization circuit (203) configured to provide adapted filter coefficients of the memristive-based filter circuit (201) based on the error signal to minimize the error signal.

A tracker circuit is provided that includes a supply modulator to selectively output at least one of a plurality of discrete voltages to a power amplifier, and a filter circuit connected between the supply modulator and the power amplifier. The filter circuit includes an inductor connected between the supply modulator and the power amplifier, a capacitor connected between ground and a path connecting the inductor and the power amplifier, and a switch connected between the supply modulator and the power amplifier without via the inductor.

An electronic filter (200a) for band stop or band pass filtering of an electrical input signal. The electronic filter (200a) comprises a memristive low-pass filter (210) comprising a first crossbar array of memristors (211, 212). Each memristor (211, 212) of the first crossbar array is configured to represent a respective filter coefficient of a low-pass filter implemented as a filter matrix. The electronic filter (200a) further comprises a memristive high-pass filter (220) comprising a second crossbar array of memristors (221, 222). Each memristor of the second crossbar array is configured to represent a respective filter coefficient of a high-pass filter function implemented as a filter matrix.

Embodiments of resonator circuits and modulating resonators and are described generally herein. One or more acoustic wave resonators may be coupled in series or parallel to generate tunable filters. One or more acoustic wave resonances may be modulated by one or more capacitors or tunable capacitors. One or more acoustic wave modules may also be switchable in a filter. Other embodiments may be described and claimed.

An embedded-cavity tunable filter integrated with high-quality, high-capacitance tuning ratio varactors, metal-insulator-metal (MIM) capacitors, and 3D inductors with alumina ceramic substrate through-vias is disclosed. The varactor and MIM capacitor dies are embedded in a blind alumina cavity (BAC) in an alumina ceramic substrate.

An acoustic transformer in a transmitter chain is disclosed. In one aspect, a differential power amplifier may produce a differential signal that is provided to a first transformer. A differential output of this first transformer is provided to an acoustic transformer that provides a single ended output signal for use by an acoustic filter. By making the second transformer an acoustic transformer, the second transformer may be integrated into the same circuitry that forms the acoustic filter, thereby simplifying the die. Further, the acoustic transformer may be tuned if ferroelectric resonators are used, which provides strong out-of-band signal cancelation.

The present invention relates to a switchable filter comprising: a filter unit in which a first filter group for filtering the frequency of a first frequency band is provided on one surface thereof and a second filter group for filtering the frequency of a second frequency band is provided on the other surface thereof on the basis of a center partition wall; and a frequency band switching unit, which moves to be adjacent to or separated from the one surface or the other surface of the filter unit, and thus converts a frequency band into the first frequency band or the second frequency band. Therefore, the deterioration of RF characteristics is prevented and selective conversion between frequency bands is facilitated.

Disclosed herein are methods, systems, and apparatuses that involve variable capacitor diodes for impedance matching. In some embodiments, an RF match circuit for impedance matching in a semiconductor fabrication chamber may comprise a variable reactance comprising a variable capacitor diode. A voltage associated with the variable capacitor diode is modified to cause a change in a width of a depletion region of the variable capacitor diode based at least in part on an impedance of a plasma load associated with plasma within at least one station of the semiconductor fabrication chamber to perform impedance matching between an RF source and the plasma load.

The present application provides apparatuses and methods for tunable filtering. In certain embodiments, tunable filters are implemented using one or more controllable capacitors formed on a semiconductor die and using one or more shielded integrated inductors formed on a secondary circuit board that is attached to a carrier circuit board. Additionally, the shielded integrated inductors are formed from patterned metallization layers of the secondary circuit board and shielding is provided on the secondary circuit board and / or carrier circuit board to shield the inductors from the semiconductor die and / or other components.

A switching circuit outputs a modulated signal. A low-pass filter circuit receives the modulated signal and applies low-pass filtering processing at a low-pass cut-off frequency to generate a demodulated signal to a load impedance. A replicating circuit receives the modulated signal and applies a replica of the low-pass filtering processing of the low-pass filter circuit to generate a reference signal. A signal processing circuit applies signal processing to the demodulated signal and the reference signal to generate at least one indicator signal which is indicative of a variation of the low-pass cut-off frequency.

A device configured to support different numbers of outputs. The device includes an input port configured to receive an input signal. The device also includes a first transmission line characterized by a first characteristic impedance and coupled to a first output port. A switch is configured to either connect or disconnect the first transmission line to the input port. The device also includes a second transmission line characterized by a second characteristic impedance and coupled between the input port and a second output port. A controller is configured to activate the first switch to set a two-output mode or to deactivate the first switch to set a one-output mode. The second characteristic impedance is configured to be the same as the first characteristic impedance at the two-output mode or configured to be reduced to 1 / √{square root over (2)} of the first characteristic impedance at the one-output mode.

A device for equalising attenuation of a signal by a radio-frequency, RF, chain, includes an input port (18;39;57), an output port (19;40;58), at least one series path interconnecting the input port (18;39;57) and the output port (19;40;58), and at least one shunt path (35;50,53;62,65) having an impedance of which the magnitude increases with frequency. At least one of the series paths and the shunt paths (35;50,53;62,65) includes at least one variable resistor (28,32,36;47,51,54;63,66). The device includes a device (13) for adjusting the respective resistance values of the variable resistors (28,32,36;47,51,54;63,66). Each series path interconnecting the input port (18;39;57) and the output port (19;40;58;70) is a series path including all nodes (20;41,42;59,60) connecting the respective at least one shunt paths (35;50,53;62,65) to the at least one series paths.

The present invention relates to a biquad filter capable of independently adjusting each parameter. In the biquad filter of the embodiment, an output terminal of a first integrator is connected to an input terminal of a negative side of a second integrator, the output terminal of the first integrator is connected to a first input of a negative side of an adder via an inverting amplifier, an output terminal of the second integrator is connected to a second input terminal of the negative side of the adder, an input terminal for inputting an input signal is connected to a third input terminal of the negative side of the first adder, and an output terminal of the adder is connected to an input terminal of a negative side of the first integrator.

A splitter / combiner having a first port, a second port, and a third port includes a first transmission line coupled between the first port and the second port, a second transmission line coupled between the first port and the third port, a resistor coupled between the second port and the third port, and first and second capacitors each having a first terminal and a second terminal, the first terminal of the first capacitor coupled to the second port, the first terminal of the second capacitor coupled to the third port, the second terminal of each of the first and second capacitors coupled to a common node. At least one of the first capacitor, second capacitor, first transmission line, and second transmission line is adjustable during operation for varying the electrical properties of the splitter / combiner.

A device configured to support different numbers of outputs. The device includes an input port (301) configured to receive an input signal. The device also includes a first transmission line (310) characterized by a first characteristic impedance and coupled to a first output port (302). A switch (320) is configured to either connect or disconnect the first transmission line to the input port. The device also includes a second transmission line (330) characterized by a second characteristic impedance and coupled between the input port and a second output port (303). A controller (350) is configured to activate the first switch to set a two-output mode or to deactivate the first switch to set a one-output mode. The second characteristic impedance is configured to be the same as the first characteristic impedance at the two-output mode or configured to be reduced to 1 / SQRT(2) of the first characteristic impedance at the one-output mode.

An example filter for radio frequency signals in a radio includes first resonators (2021, 2022, 2023, 2024) coupled in series between an input (IN) and an output (OUT); a second resonator (2041, 2042, 2043, 2044) coupled as a shunt between a node in the series and a reference voltage; and a first circuit coupled in parallel with one of the first resonators or coupled in series with one of the second resonators, the first circuit including a switch (210, 404) coupled in series with an impedance (210, 410).

An active feedback RF resonator has a signal loop having a signal input and a signal output. The signal loop has a variable gain stage and at least one variable resonator, each variable resonator comprising an inductance element and a variable capacitance element comprising a number of switched fixed value capacitors and a variable capacitor. A phase noise of the active feedback RF signal has a maximum value for an operating frequency of the variable resonator that is based on an operating range of the variable capacitor.

A method for configuring a circuit for generating samples from a target distribution comprises: receiving a matrix representing parameters associated with the target distribution; tuning a plurality of tunable capacitance circuits in a tunable capacitance network based at least in part on respective elements of the matrix, wherein the tunable capacitance network consists essentially of interconnected wires intersecting at a plurality of nodes with selected pairs of nodes of the plurality of nodes interconnected by a respective tunable capacitance circuit of the plurality of tunable capacitance circuits and one or more nodes of the plurality of nodes connected to a common ground by a respective tunable capacitance circuit of the plurality of tunable capacitance circuits; recording respective voltage samples from the plurality of nodes of the tunable capacitance network; and storing a linear transformation of a vector of the voltage samples based at least in part on the matrix.

A system for filter enhancement, preferably including one or more analog taps and a controller, and optionally including one or more couplers. The system is preferably configured to integrate with a filter, such as a passband filter or other frequency-based filter. The system can be configured to integrate with an RF communication system, an RF front end, or any other suitable RF circuitry. A method for filter enhancement, preferably including configuring one or more analog taps, and optionally including calibrating a system for filter enhancement and / or receiving temperature information.

Resonator element for a filter, comprising the following: a first resonator comprising a first electrode (30) coupled to a first terminal, a second electrode (32) coupled to a second terminal, and a first piezoelectric material (31) arranged between the first electrode (30) and the second electrode (32), wherein the first terminal and the second terminal are configured for coupling to a filter structure, a second resonator with a third electrode (34) coupled to a third terminal, a fourth electrode (36) coupled to a fourth terminal, and a second piezoelectric material (35) arranged between the third electrode (34) and the fourth electrode (36), wherein the second resonator is acoustically coupled to the first resonator via at least one electrically insulating layer (33) between the second electrode (32) and the third electrode (34), and a tuning circuit (15) which is coupled to the third and fourth terminals.

An impedance- matching network for a radio frequency (RF) transmission system can include first port for coupling to a first transistor differential pair. The network can further include a second port for coupling to a second transistor differential pair. The network can further include a matching network connected to the first port and die second port, the matching network comprised of a pair of coupled lines. Other aspects are described.

Front-end systems with an adjustable filter architecture are provided. In certain embodiments, a front-end system includes a first bandpass filter with a first passband, a second bandpass filter with a second passband, a stopband filter with a stopband, and switches for controlling connectivity of the filters along transmit and receive paths. The first passband and the second passband include a frequency overlap region, which the stopband at least partially overlaps. The re-configurability of the switches allows for the overall filtering characteristic of the adjustable filter to adjust the duplex gap between transmit and receive passband edges, as well as the passband edges themselves.

An acoustic filter assembly for operating at a target band including multiple spaced sub-target bands. The filter assembly includes a first filter that passes a first band and a second filter that passes a second band. The first filter and the second filter have a transition band between the first band and the second band that is wider than the spacing between the sub-target bands. An interface receives a control signal that controls the transition band to be shifted between a first position and a second position, such that an upper part of a lower sub-target band is covered by the first band in the first position, and a lower part of an upper sub-target band is covered by the second band in the second position.

The present invention relates to a design of a wireless power transmission system and a method for controlling an optimal resonance frequency applied to the system, and provides a wireless power transmission system and a method for controlling an optimal resonance frequency applied to the system, wherein, by a method of designing a power transmission unit to match a frequency control range and by designing a quality factor (Q) of a resonance unit of a power reception unit to be low so that the difference in power reception performance is not large within the control frequency range, power can be received stably even if there is a change in resonance frequencies of a wireless power transmission system installed in a metal environment, and the system frequency can be easily and quickly controlled so as to search for and find the optimal resonance frequency.

A power divider / combiner circuit may include a first port configured to receive a signal, a second port, and a third port. The circuit may include an unequal Wilkinson power divider / combiner circuit including a first node coupled to the first port, a second node coupled to the second port, and a third node. The unequal Wilkinson power divider / combiner circuit is configured to receive a signal at the first node and divide the signal to produce a first signal at the second node and a second signal at the third node. The circuit may include a configurable impedance transformation circuit coupled between the third node and the third port. The configurable impedance circuit is configured to provide a configurable phase shift and a configurable attenuation of the second signal to provide a selected power division ratio between the first signal at the second port and the second signal at the third port.

Multi-frequency capacitance cancellation in an acoustic filter circuit is provided. The acoustic filter circuit includes an acoustic resonator configured to resonate in a series resonance frequency to pass a radio frequency (RF) signal. However, the acoustic resonator may create an electrical capacitance that can cause the acoustic resonator to resonate at multiple operating frequencies outside the series resonance frequency, thus compromising performance of the acoustic resonator at these operating frequencies. Herein, a negative capacitance circuit is provided in parallel to the acoustic resonator and configured to present multiple negative capacitances to cancel (or at least reduce) the electrical capacitance at the operating frequencies. As a result, it is possible to improve the performance of the acoustic filter circuit across a broader frequency bandwidth.

A differential double balanced duplexer (dDBD) includes a transmitter and a first balun coupled to a first impedance tuner that produces a first impedance that blocks received signals at a first frequency range from travelling across the first balun and into the transmitter, and a second impedance that passes transmitted signals at a second frequency range to travel across the first balun to the antenna. The dDBD also includes a receiver and a second balun coupled to a second impedance tuner that produces a first impedance that allows the received signals at the first frequency range to travel across the second balun and into the receiver, and a second impedance that blocks the transmitted signals at the second frequency range from travelling across the second balun and into the receiver. As such, the dDBD allows for increased isolation and decreased insertion loss.

Embodiments disclosed herein include an impedance matching network. In one embodiment, the impedance matching network includes an input and a first matrix adjustment element on a first branch from the input, the first matrix adjustment element having a variable capacitance. In one embodiment, the impedance matching network further includes a transformer on a second branch from the input, the transformer having at least a first tap, a second matrix adjustment element on the first tap, and the second matrix adjustment element having a variable capacitance. In one embodiment, the impedance matching network further includes a third matrix adjustment element on the second branch after the transformer, the third matrix adjustment element having a variable capacitance. In one embodiment, the impedance matching network further includes an output on the second branch after the third matrix adjustment element.