27 results about "Linearizer" patented technology

An artificial intelligence (AI) driven linearizer for a transmitter, comprising an input interface for inputting linearizer signals comprising information carrying signals, and operating conditions parameter signals, other than the information carrying signal, wherein the operating conditions parameter signals represent metrics affecting transfer characteristics of the transmitter, over a selected operating range of the transmitter, and a predistortion actuator circuit configured with an AI predistortion model for predistorting at least part of the information carrying signal to produce predistorted signals, the predistortion model being configured to be operable for adaptation to said characteristics of the transmitter using a single set of model coefficients that are unchanged over said entirety of said selected operating range.

The present invention relates to a technique for compensating the non-linear distortion of an electroacoustic transducer T, based on post-processing applied to the electrical signal delivered by the transducer by means of a harmonic non-linearizer component M disposed downstream of it. Figure for the abstract: Figure 2

An apparatus is disclosed for frequency-based predistortion signal generation. In an example aspect, the apparatus includes a predistortion linearizer circuit configured to be coupled to an input of an amplifier. The amplifier has non-linearities associated with multiple frequencies. The multiple frequencies include a first subset of frequencies and a second subset of frequencies. The predistortion linearizer circuit is also configured to accept an input signal. The predistortion linearizer circuit is additionally configured to generate, based on the input signal, a compensation signal to attenuate the non-linearities existing within the first subset of frequencies more than the non-linearities existing within the second subset of frequencies. The predistortion linearizer circuit is further configured to generate a pre-distorted signal based on the input signal and the compensation signal.

A capacitive gyroscope includes a vibrating structure, a primary drive transducer configured to oscillate the structure in a primary mode of motion, a primary pick off transducer to detect oscillation of the structure in the primary mode of motion. The gyroscope may also include a secondary pick off transducer configured to detect oscillation of the structure in a secondary mode of motion, a secondary drive transducer configured to null oscillation of the structure in the secondary mode of motion, a divider configured to determine an angular rate of rotation of the capacitive gyroscope based on an output from the primary pick off transducer and an output indicative of a secondary drive signal for the secondary drive transducer. The gyroscope may also include a linearizer linearize the output from the primary pick off transducer based on at least one higher order harmonic of the output from the primary pick off transducer.

The present invention discloses a field effect transistor adjustable predistortion linearizer, which specifically adopts a series transmission structure and is cascaded by front and rear stage nonlinear generators. The first part is a front stage common gate structure, which adopts the connection mode of the common gate of the field effect transistor. The radio frequency signal is input from the source stage of the field effect transistor, and the drain stage outputs and enters the rear stage. The second part is a rear stage common source structure, which adopts the connection mode of the common source of the field effect transistor. The radio frequency signal is input from the gate stage of the field effect transistor, and the drain stage outputs. The front stage and the rear stage are connected by a matching microstrip line. The field effect transistor as a nonlinear generating device operates in the variable resistance region, and its predistortion characteristics are changed by adjusting the gate voltage; by separately changing the front stage bias voltage, the independent adjustment of the AM-PM characteristic is realized; by separately changing the rear stage bias voltage, the independent adjustment of the AM-AM characteristic is realized, thereby reducing the amplitude correlation; and the adopted circuit structure is based on the superposition principle, greatly simplifying the adjustable linearizer circuit and being easy to adjust.

Embodiments of a linearization system and method of operation thereof are disclosed. In one embodiment, a method of operation of a linearization system for a radio node for a wireless network comprises obtaining a plurality of input signals (x 1 , …,x P ) for P input dimensions, respectively, for a P-dimensional LUT for compensating for non-linear characteristics of one or more components of the radio node, wherein P is an integer value that is greater than 1. The method further comprises generating a compensation signal based on the plurality of input signals (x 1 , …,x P ) and a plurality of 1-dimensional (1-D) Look-Up Tables (LUTs) that directly model the P-dimensional LUT. The method further comprises applying the compensation signal to a particular signal to provide a compensated signal for further processing by the radio node.

A wideband power amplifier (PA) linearization technique is proposed. A current interpolation technique is proposed to linearize power amplifiers over a wide bandwidth. The wideband power amplifier linearization technique employs a novel transconductance Gm linearizer using a current interpolation technique that achieves improvement in the third order intermodulation over wide bandwidth for a sub-micron CMOS differential power amplifier. By using a small amount of compensating bias into an opposite phase differential pair, linearization over wide bandwidth is achieved and can be optimized by adjusting the compensating bias.

A linear amplifying device and a linear amplifying method are related to the linear amplifying device including an amplifying circuit, an attenuator, a linearizer, and a phase shifter. The attenuator, the linearizer and the phase shifter are connected in series and in order between an input terminal of the amplifying circuit and an output terminal of the amplifying circuit. The linear amplifying method includes receiving an input signal, generating an output signal according to the input signal and a gain, attenuating the output signal, generating a non-linear carrier wave in the attenuated output signal; adjusting a phase of the non-linear carrier wave to generate a feedback signal; and generating another output signal according to the input signal, the feedback signal, and the gain.

An amplifier (Trc,Trp) uses a GaN HEMT. A diode linearizer (LNZ) and a variable attenuator (VATT) are connected in series to an input of the amplifier (Trc, Trp). A peak detector (DET) detects a peak value of a drain voltage of the amplifier (Trc,Trp). A controller (CTL) makes the diode linearizer (LNZ) function as a linearizer to reduce an attenuation amount of the variable attenuator (VATT) if the peak value exceeds a threshold.

The present application provides an amplifier device which is downsized. The amplifier device includes: an RF signal input terminal to which an RF signal is input; a buffer circuit having an input terminal connected to the RF signal input terminal, the RF signal being input to the input terminal; a linearizer; a power amplifier; and a control circuit. The linearizer includes a transistor provided at an input of the linearizer and having a control terminal. The control circuit outputs a first gate voltage which causes the transistor to operate in class B to the control terminal when a level of the RF signal input to the RF signal input terminal is a first level, and outputs a second gate voltage which causes the transistor to operate in class AB to the control terminal when the level of the RF signal is a second level higher than the first level. An output impedance of the buffer circuit viewed from an input side of the linearizer is set such that a reflection loss of the RF signal input from the buffer circuit to the linearizer becomes equal to or less than a predetermined level.

An artificial intelligence (AI) driven transmission system, having a deployed transmitter including a linearizer and power amplifier wherein the deployed transmitter is deployed in an operational configuration in an operational environment. The system includes a processor configured with an input interface to input digitized linearizer signals, the linearizer signals including information carrying signals, and operating conditions parameter signals, other than the information carrying signal representing metrics affecting transfer characteristics of the deployed transmitter over an entirety of the deployed transmitter operating range. The system further including a digital model of the transmitter, for processing the input digitized linearizer signals and for outputting digital model output signals.

The present disclosure relates to a radio frequency circuit comprising a linearizer circuit. The linearizer circuit may comprise a first capacitor and a second capacitor arranged in parallel. The first capacitor may have a positive third order derivative of charge with respect to voltage. The second capacitor may have a negative third order derivative of charge with respect to voltage. Related radio frequency modules and wireless communication devices are also disclosed.

A method of identifying the presence of a first gas, such as methane, within a sample, the first gas comprising, for example, natural gas. A detector is provided having a sensor responsive to a first wavelength, a sensor responsive to a second wavelength, and a sensor for collecting reference readings. The gas sample is analyzed to obtain a first absorption reading corresponding to the first wavelength, a second absorption reading corresponding to the second wavelength, and a reference reading. A first absorption number is calculated using the first absorption reading and the reference reading, and a second absorption number is calculated using the second absorption reading and the reference reading. A linearizer function is applied to each of the first and second absorption numbers to calculate first and second concentration numbers. The sensor for each wavelength is calibrated for detecting the first gas so that the data collected at each wavelength gives the same reading when only the first gas is present in the sample. A ratio of the first concentration number to the second concentration number is then calculated and used to identify whether only the first gas is present in the sample.

A wireless device may include a plug that is shared by high speed data, analog audio signals, and power. Switches may be included on wires between the plug and the circuits that provide the high-speed data, analog audio signals and power to isolate those circuits from overvoltage conditions. Linearizer circuits may be included to provide gate driving signals to the switches, e.g., during transmission of analog audio signals. The linearizer circuits may include digital-to-analog converters to apply a gain factor to analog audio signals.

Circuits and methods for achieving good amplifier AM-AM and AM-PM metrics while achieving good power, PAE, linearity, and EVM performance. Embodiments compensate for a non-linear distortion profile (e.g., an AM-PM and / or AM-AM profile) in an amplifier by pre-processing an input signal, such as a radio-frequency signal, to alter the non-linear distortion profile of the input signal so as to compensate for the non-linear distortion profile imposed by a coupled device, such as an amplifier. An inventive aspect includes linearizing an output from an amplifier having a first non-linear distortion profile, including passing an input signal having a second non-linear distortion profile through a reflective hybrid coupler to a non-linear termination circuit, and reflecting a modified input signal from the non-linear termination circuit back through the reflective hybrid coupler as an output signal, the output signal having a third non-linear distortion profile shaped to compensate for the first non-linear distortion profile.

There is provided mechanisms for enabling linearization of a non-linear electronic device. A method is performed by a linearizer device. The method comprises receiving an input signal destined to be input to the non-linear electronic device. Input-output characteristics of the non-linear electronic device is represented by a model. The model is defined by a mathematical expression, and wherein input-output characteristics of the linearizer device is given by the linearization function. The linearization function is determined by applying a function recursion to the mathematical expression of the model. The method comprises obtaining an output signal by subjecting the input signal to the linearization function. The method comprises providing the output signal, instead of the input signal, as input to the non-linear electronic device, thereby enabling linearization of the non-linear electronic device.

A method of operating a load-modulated linearizer is described for linearizing the output signal of a nonlinear power amplifier. The load-modulated linearizer comprises a first and second hybrid coupler and at least two control amplifiers, connected to different ports of the hybrid couplers. The at least two control power amplifiers are configured for providing an identical signal response in use. The first hybrid coupler comprises a control signal input and the second hybrid coupler comprises a linearization port for providing the linearized output signal. For performing the linearization the method comprises generating, by a signal generator, the control signal. This generating comprises receiving, at an input port of the signal generator, a main input signal to be amplified by the nonlinear power amplifier; and generating, by the signal generator, a mimicked output signal wherein the mimicked output signal is a representation of the output signal of the nonlinear power amplifier. The generating of the control signal further comprises generating, by the signal generator and based on the mimicked output signal, said control signal for the at least two control power amplifiers.

A concurrent multi-band linearized transmitter (CMLT) has a concurrent digital multi-band predistortion block (CDMPB) and a concurrent multi-band transmitter (CMT) connected to the CDMPB. The CDMPB can have a plurality of digital baseband signal predistorter blocks (DBSPBs), an analyzing and modeling (A&M) stage, and a signal observation feedback loop. Each DBSPB can have a plurality of inputs, each corresponding to a single frequency band of the multi-band input signal, and its output corresponding to a single frequency band; each output connect corresponding to an input of the CMLT. The A&M stage can have a plurality of outputs connected to and updating the parameters of the DBSPBs, and a plurality of inputs connected to either both outputs of the signal observation loop or the output of the subsampling loop and to outputs of the DBSPBs. The A&M stage can perform signals' time alignment, reconstruction of signals and compute parameters of DBSPBs.

The invention discloses a high-linearity millimeter wave broadband power amplifier based on a cross cold field effect transistor pair, which belongs to the technical field of wireless communication, and comprises a linearizer consisting of a self-adaptive double-voltage path biasing circuit and a cross cold field effect transistor pair, a driving stage module and a power stage module, an input matching network, an inter-stage matching network and an output matching network; the broadband OP1dB performance of the millimeter wave power amplifier can be improved by a linearizer technology combining a self-adaptive dual-voltage path biasing circuit and a cross cold field effect transistor pair and by adjusting the gain pole positions of an input matching network, an inter-stage matching network and an output matching network; and good broadband OP1dB performance can be realized in both small signal performance and large signal performance.

The invention discloses a linear amplification device and a linear amplification method thereof. The invention relates to a linear amplification device. The linear amplification device comprises an amplification circuit, an attenuator, a linear device and a phase shifter, one end of the attenuator is electrically connected to the output end of the amplifying circuit. The input end of the linear device is electrically connected to the other end of the attenuator. One end of the phase shifter is electrically connected to the output end of the linear device, and the other end of the phase shifter is electrically connected to the input end of the amplifier. The linear amplification method comprises the following steps: receiving an input signal; generating an output signal according to the input signal and a gain; attenuating the output signal; generating a nonlinear carrier in the attenuated output signal; adjusting the phase of the nonlinear carrier to generate a feedback signal; and generating another output signal according to the input signal, the feedback signal and the gain.

Circuits, systems, and methods to compensate for non-linearities associated with a switching circuit are discussed herein. For example, a switch circuit can include a switch arm and a linearizer arm. The switch arm can have a first transistor connected between an input node and an output node. The switch arm can be configured to receive a radio-frequency signal. The linearizer arm can have a second transistor connected to at least one of a gate or a body of the first transistor. The linearizer arm can be configured to compensate a non-linearity effect generated by the switch arm.

The wireless device may include a plug shared by high speed data, analog audio signals, and power. A switch may be included on a wire between the plug and the circuitry providing the high speed data, analog audio signal, and power to isolate these circuitry from overvoltage conditions. A linearizer circuit may be included to provide a gate drive signal to the switch, for example, during transmission of an analog audio signal. The linearizer circuit may include a digital-to-analog converter to apply a gain factor to the analog audio signal.

To provide a linearizer that compensates for the frequency dependency of distortion components of power amplifiers for transmission waves in high frequency bands of 100 GHz or more and wide bands of several GHz or more.SOLUTION: A linearizer 1, which compensates for the nonlinear characteristics of a power amplifier 900, includes N predistorters 12 and N filters 14 connected one-to-one to the N predistorters 12. The i-th predistorter 12-i of the N predistorters 12 compensates for the frequency dependency of a distortion component contained in a radio signal in the i-th divided bandwidth among N divided bandwidths obtained by dividing the bandwidth of a radio signal in the sub-terahertz band of 100 GHz or higher by N in the frequency domain. The i-th filter 14-i of the N filters 14 passes the radio signal from the i-th predistorter 12-i in the i-th divided bandwidth.SELECTED DRAWING: Figure 1

There is provided mechanisms for enabling linearization of a non-linear electronic device. A method is performed by a linearizer device. The method comprises receiving an input signal destined to be input to the non-linear electronic device. Input-output characteristics of the non-linear electronic device is in the linearizer device represented by a linearization function defined by a LUT based model of base functions. The linearizer device is configured to in a greedy pursuit framework select the base functions according to a signal reconstruction criterion. The method comprises obtaining an output signal by subjecting the input signal to the linearization function. The method comprises providing the output signal, instead of the input signal, as input to the non-linear electronic device, thereby enabling linearization of the non-linear electronic device.

FIELD: radio engineering.SUBSTANCE: device for digital linearization of a power amplifier is proposed, comprising a power amplifier, a linearizer, a digital-to-analogue converter connected to the first output of the linearizer, for converting a digital linearized signal for setting the power amplifier into an analogue signal for adjusting the gain of the power amplifier. A digital frequency synthesizer is introduced, the input of which is connected to the second output of the linearizer, and the output is connected to the input of a power amplifier, to the output of which an attenuator, a signal conversion device that converts a high-frequency signal into a low-frequency analogue signal, and an analogue-to-digital converter, the output of which is connected to the input of the linearizer, are connected in series, and the linearizer records the value corresponding to the specified power at the output of the power amplifier, which is then compared with the current values of the power of the power amplifier, supplied to the linearizer from the output of the analogue-to-digital converter.EFFECT: simplification of the digital linearization device of a power amplifier.3 cl, 2 dwg

The present disclosure relates to a radio frequency circuit comprising a linearizer circuit. The linearizer circuit may comprise a first capacitor and a second capacitor arranged in parallel. The first capacitor may have a positive third order derivative of charge with respect to voltage. The second capacitor may have a negative third order derivative of charge with respect to voltage. Related radio frequency modules and wireless communication devices are also disclosed.

The invention discloses an efficient linear radio frequency Doherty power amplifier which comprises a power division unit, a pre-distortion unit, a power amplification unit and a combining unit. According to the Doherty power amplifier, the pre-distortion unit is added between the power division unit and the power amplification unit, so that the problem of segmented nonlinear characteristics of the Doherty power amplifier is solved, gain compensation is carried out on two times of gain compression of the Doherty power amplifier, and the linearity of the Doherty power amplifier is improved; according to the Doherty power amplifier, the main path and the auxiliary path of the pre-distortion unit and the power amplifier unit are cascaded, the problem that a linearizer is difficult to be directly applied to the Doherty power amplifier is solved, the brought-in loss is low, the influence on the overall performance of the Doherty power amplifier is small, and the contradiction between the efficiency and the linearity of the Doherty power amplifier is balanced.