123 results about "Radio frequency power transmission" patented technology

An electrode is exposed to a plasma generation volume and is defined to transmit radiofrequency power to the plasma generation volume, and includes an upper surface for holding a substrate in exposure to the plasma generation volume. A gas distribution unit is disposed above the plasma generation volume and in a substantially parallel orientation to the electrode. The gas distribution unit includes an arrangement of gas supply ports for directing an input flow of a plasma process gas into the plasma generation volume in a direction substantially perpendicular to the upper surface of the electrode. The gas distribution unit also includes an arrangement of through-holes that each extend through the gas distribution unit to fluidly connect the plasma generation volume to an exhaust region. Each of the through-holes directs an exhaust flow from the plasma generation volume in a direction substantially perpendicular to the upper surface of the electrode.

A radio frequency (RF) amplifier system includes an RF power amplifier having an input and an output, and a typical gain of 1000 or more between the input and the output. An adaptive feedback channel is coupled between the input and the output of the RF power amplifier. The adaptive feedback channel receives as inputs audio signals for modulation of the input of the RF power amplifier, a frequency command word indicative of a desired frequency and phase of the RF amplifier system, and a control word indicative of a desired power level of the output of the RF power amplifier and of a mode of operation of the RF amplifier system. In response to the inputs, the adaptive feedback channel provides as an output a degenerative feedback signal to the input of the RF power amplifier.

An amplitude component and a phase component among modulating signals are supplied into a radio frequency wave input terminal and a power supply terminal of a radio frequency power amplifier, respectively, and an original modulated wave is obtained from an output of the radio frequency power amplifier. The output of the radio frequency power amplifier is detected by an output detecting section, correction data to a detection voltage closest to the detection voltage among correction datatables which have been measured in various temperature environments and stored in advance are selected by a selector, and correction of an amplitude component and a phase component is performed by phase-amplitude correction means. Thereby enabling EER operation without spectrum degradation.

A method and a supply modulator (SM) are provided for supplying power from a wireless transmitter to a radio frequency (RF) power amplifier. A power control signal input from a modem is received. A reference voltage is determined. An operating mode of the SM is changed by controlling a level of the reference voltage. A voltage is determined based on the level of a reference voltage. When the operating mode of the SM is an ET mode, a first output signal from a linear regulator and a second output signal from a switching regulator are combined to obtain a combined result, and the combined result is output. The first output signal is based on the voltage. When the operating mode of the SM is an APT mode, the voltage based on the reference voltage is output.

The invention provides a radio frequency front-end circuit structure, which comprises a receiver radio frequency front-end and a transmitter radio frequency front-end. A first switching tube is joined between a low noise amplifier in the receiver radio frequency front-end structure and an impedance matching network, a second switching tube is joined between the low noise amplifier and a power supply, a third switching tube is joined between a radio frequency power amplifier in the transmitter radio frequency front-end structure and the impedance matching network, and a fourth switching tube is joined between the radio frequency power amplifier and the power supply. Enablement of all the above-mentioned switching tubes is controlled by enable signals generated by a digital baseband, and the low noise amplifier and the radio frequency power amplifier employ the same off-chip inductor, which is connected with a receiving antenna. The radio frequency front-end circuit structure in the invention is simple without a duplexer and guarantees the proper functioning of a transceiver in two states; has only one off-chip inductor instead of two, thereby reducing the cost and area of passive devices; and guarantees all the performances of the transceiver.

The invention discloses a self-adaptive digital pre-distortion linear system of a radio frequency power amplifier, comprising a base band processing module, a digital pre-distortion compensation module and a radio frequency power amplifier; the digital pre-distortion compensation module is connected to the middle of the base band processing module and the radio frequency power amplifier and used for bettering the distortion caused by the nonlinearly amplification of the radio frequency power amplifier. The invention provides the complete and optimized self-adaptive digital pre-distortion linear system structure of the radio frequency power amplifier capable of supporting various pre-distortion models; the invention has the advantages of being wide in applicable range, simple in structure and lower in implement cost at the fixed point.

The invention provides an envelope tracking radio frequency power amplifier which comprises an input direction coupler, an envelope signal detection circuit, an envelope signal amplifier, a delay component, a clamping circuit and a radio frequency power amplifier body. Input signals are divided into two parts through the input direction coupler; one part of input signals pass through the envelope signal detection circuit, the envelope signal amplifier and the clamping circuit and then provide bias for the radio frequency power amplifier body; the other part of input signals pass through the delay component, so that the bias voltage of the radio frequency power amplifier body and the input signals are completely synchronous; finally, real-time envelope tracking is achieved. The envelope signal amplifier amplifies the envelope signals, so that the envelope signals are large enough to provide bias for the radio frequency power amplifier body. The clamping circuit limits the amplitude value of the amplified signals amplified by the envelope signal amplifier, and reduces the distortion of the envelope tracking radio frequency power amplifier. All the components of the envelope tracking radio frequency power amplifier can be designed to work at wide frequency, and can meet multiple wireless communication standards.

The invention discloses a power control circuit. The invention relates to control on power of a power amplifier and in particular relates to control on current of a power amplifier under different power requirements. The common power control circuits are only regulated by power control signals generated by basebands and can not optimize the current due to different power requirements, therefore the fixed bias circuits designed to meet the high power requirement can lead to unnecessary current consumption under low power requirement. The invention provides a method for dynamically regulating the current according to difference of the output power of the power amplifier. In principle, the method relates to a system which comprises a power supply control circuit and a power amplifier, wherein the power supply control circuit comprises an error amplifier, two voltage stabilizers and a current detection circuit; the detection circuit detects the current flowing through the power amplifier and generates a detection signal; the signal can be a voltage or a current; in one embodiment, the current flowing through the power amplifier can be copied and reduced to a scale; the copied current is further modulated by an input power control signal and is fed back to the error amplifier; and then the error amplifier generates an output voltage to control a base on the power amplifier, thus achieving the aims of dynamically controlling the base voltage and further optimizing the current. The power control circuit is mainly used for controlling the power of the radio frequency power amplifiers.

The application provides a power supply control method and device of a radio frequency power amplifier, terminal equipment and medium. The method comprises the following steps: acquiring a mapping relation table corresponding to a reference channel of the radio frequency (RF) power amplifier, acquiring an adjacent frequency channel leakage ratio when the RF power amplifier works under the non-reference channel with the reference power supply voltage and the reference RF gain index and transmits the preset power; determining a first voltage compensation value corresponding to the non-referencechannel according to the adjacent frequency channel leakage ratio and the target adjacent frequency channel leakage ratio, and compensating the reference power supply voltage according to a first voltage compensation value to obtain the power supply voltage of the non-reference channel. Therefore, the power supply voltage of the non-reference channel is compensated according to the adjacent frequency channel leakage ratio of the non-reference channel working with the working parameter of the reference channel, thereby guaranteeing that the adjacent frequency channel leakage ratio satisfies therequirement and the power consumption of the RF power amplifier achieves the best when the RF power amplifier works at the non-reference channel.

The invention is applicable to the field of radio frequency communication, and provides a harmonic power amplifying circuit with high efficiency and a wide bandwidth and a radio frequency power amplifier. The circuit comprises an input matching network, a transistor and an output matching network; a grid electrode of the transistor is connected with an output end of the input matching network, a drain electrode of the transistor is connected with an input end of the output matching network, and a source electrode of the transistor is grounded; the output matching network causes a lower sideband of the harmonic power amplifying circuit to work in a continuous inverse F amplification mode and causes an upper sideband of the harmonic power amplifying circuit to work in a continuous F amplification mode; and the output matching network and a parasitic network of the transistor form a low pass filter. According to the harmonic power amplifying circuit provided by the invention, due to the transition from the continuous inverse F power amplifier working mode to the continuous F power amplifier working mode, the efficiency of a continuous harmonic control power amplifier is effectively improved to be higher than 60%, a relative bandwidth is improved to be higher than 80%, and the harmonic impedance is simple to match and easy to realize.

A resonant power converter for ultra-efficient radio frequency transmission and associated methods. In one exemplary embodiment, the invention is digitally actuated and uses a combination of a noise-shaped encoder, a charging switch, and a high-Q resonator coupled to an output load, typically an antenna or transmission line. Energy is built up in the electric and magnetic fields of the resonator, which, in turn, delivers power to the load with very little wasted energy in the process. No active power amplifier is required. The apparatus can be used in literally any RF signal application (wireless or otherwise), including for example cellular handsets, local- or wide-area network transmitters, or even radio base-stations.

The invention provides a flyback type multi-level output direct current power supply for quick tracking reference. The power supply can be used for occasions where power supply voltage requires to be changed, for example, power supplies of a radio frequency power amplifier and a sound power amplifier can effectively improve power of the power amplifiers and reduce consumption. The direct current power supply increases auxiliary side winding number on the base of a flyback type switch power supply, connects outputs of each auxiliary side in series, and is matched with control of an auxiliary side output switch tube to achieve variation of output levels. Connection and disconnection of the auxiliary side output switch tube are controlled by input reference, so that the output levels can track input reference signals. Two-stage control strategy of the primary side switch tube control and the auxiliary side switch tube control are adopted in control, system response speed is increased, and anti-jamming capability is improved.

A radio frequency power amplifier module that brings sufficient attenuation to a radio frequency signal in a bias supply line connecting a bias control part and a radio frequency power amplifier part without increasing module substrate area is aimed. At least one bonding pad 106 having a capacitance component to a ground and stitch structure inductances 108, 109 composed of a bonding wire 105 provided via the bonding pad are provided in the bias supply line connecting the bias control part and the radio frequency power amplifier part.

The invention discloses a system and method for testing a radio frequency power amplifier in a mobile terminal. The system is composed of a signal module, a computer, a single-chip microcomputer, a radio frequency power amplifier, and a testing unit. The signal module is used for generating an original signal that is not processed; the computer is used for downloading a compiled testing code to the single-chip microcomputer by a serial interface; the single-chip microcomputer is used for controlling the radio frequency power amplifier to carry out amplification processing on the original signal according to the testing code; and the testing unit is used for testing whether the original signal after the amplification processing reaches the strength for antenna transmission. Therefore, the radio frequency power amplifier is tested by a relatively simple and high-speed way and the testing efficiency of the radio frequency power amplifier is improved.