7 results about "Linearizer" patented technology

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.

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.

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.

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