19 results about "Balanced amplifier" patented technology

This invention provides an unmanned aerial vehicle (UAV) image transmission system and image transmission method. The system includes: a radio frequency (RF) transceiver, a balanced amplifier circuit, a low-noise amplifier, and an RF switch. The balanced amplifier circuit includes at least two parallel power amplifiers configured to superimpose the amplified signals from each power amplifier in phase to synthesize the output power. The RF transceiver generates a time-division duplex control signal to synchronously control the switching of each component between transmit and receive modes. By employing a balanced amplifier circuit, this invention enables each power amplifier to operate in a region with better linearity, thereby improving transmit power while ensuring the signal quality required for high-order modulation, thus balancing long-distance transmission and high-definition image quality.

To improve the power efficiency of a power amplifier.SOLUTION: The power amplifier 100,101 includes a balanced amplifier BA and a control amplifier 5. The balanced amplifier BA includes a first amplifier 1 and a second amplifier 2 that amplify input power. A load modulation balanced amplifier is formed by a control amplifier 5 and a balanced amplifier BA and a control signal including a harmonic component of input power is fed to the balanced amplifier BA. The control amplifier 5 is a class AB amplifier or a class B amplifier. Each of the first amplifier 1 and the second amplifier 2 is a class C amplifier.SELECTED DRAWING: Figure 2

A power amplifier includes a balanced type amplifier and a control amplifier. The balanced type amplifier includes a first amplifier and a second amplifier and is configured to amplify an input power. The control amplifier is configured to form a load modulated balanced amplifier together with the balanced type amplifier and output a control signal including a fundamental wave component or a harmonic component of the input power to each of the first amplifier and the second amplifier. The control amplifier is disposed between the first amplifier and the second amplifier.

The invention provides an emission driving system and nuclear magnetic resonance equipment, and relates to the technical field of magnetic resonance. The emission driving system comprises a load modulation balance amplifier, a switching module and a control module. The first end of the load modulation balance amplifier is connected with the body coil; the first end of the switching module is connected with the second end of the load modulation balanced amplifier, the second end of the switching module is connected with the third end of the load modulation balanced amplifier, and the third end of the switching module is connected with the local coil; the control module is configured to control the switching module to be in the first conduction state or the second conduction state. The emission driving system aims at solving the problems that in the prior art, the cost of a body coil and local coil emission mode switching scheme of magnetic resonance imaging equipment is high, and the size is large due to the fact that a power amplifier cannot be reused.

According to an aspect of the present disclosure, the balanced amplifier of the PD-LMBA module comprises one or more first semiconductor dies mounted on the substrate and on which a first power transistor and a second power transistor are integrated. The balanced amplifier further comprises a first matching network, a second matching network, and a transmission line-based directional coupler. The first and second matching network each comprise a shunt capacitive element of which a non-grounded terminal is connected to the relevant port of the directional coupler and a connection connecting the output of the relevant power transistor to this port.

Balanced topology multi-signal duplex synthesis and power amplifier and amplification method based on, belong to communication technical field, include: the two ports of the input side of first stage 90 DEG electric bridge receive a frequency point signal respectively, the two ports of the output side of first stage 90 DEG electric bridge are connected the input end of two power amplifiers of two branches respectively, and the output end of two amplifiers is connected to the two ports of the input side of secondary 90 DEG electric bridge respectively.The present application has the advantages of balanced amplifier power synthesis and high stability, and also has the function of double-band signal duplex synthesis and power amplifier, avoids the problem of amplifier gain decline caused by the insertion loss of duplexer or combiner.Compared with the traditional balanced amplifier, the method realizes duplex synthesis, filtering and power amplification with extremely simple topology, effectively improves the efficiency of the amplifier, and effectively reduces the number of hardware and improves the performance of the amplifier.

A parallel e-fuse device including: a first e-fuse to receive an input voltage and transfer a first fuse current to an output terminal; and a second e-fuse to receive the input voltage and transfer a second fuse current to the output terminal, the first e-fuse includes: a power transistor to control the first fuse current according to a gate voltage; a clamp amplifier to provide a charging current to charge a gate of the power transistor, the charging current being obtained by monitoring a feedback voltage; a balance amplifier to provide a first sinking current to discharge the gate of the power transistor, the first sinking current being obtained by comparing a current sensing signal with a current monitoring signal, wherein the clamp amplifier generates the charging current according to a differential voltage between the feedback voltage and a reference voltage.

The invention relates to a power amplifier. The power efficiency of the power amplifier is improved. A power amplifier (100, 101) is provided with a balanced amplifier (BA) and a control amplifier (5). A balanced amplifier (BA) includes a first amplifier (1) and a second amplifier (2) that amplify input power. The control amplifier (5) forms a load modulation balanced amplifier together with the balanced amplifier (BA), and supplies a control signal including a harmonic component of the input power to the balanced amplifier (BA). The control amplifier (5) is a class AB amplifier or a class B amplifier. The first amplifier (1) and the second amplifier (2) are respectively class-C amplifiers.

Suppresses oscillation in power amplifiers. [Solution] The power amplifier comprises a balanced amplifier and a control amplifier. The balanced amplifier includes a first amplifier and a second amplifier and amplifies the input power. The control amplifier, together with the balanced amplifier, forms a load-modulated balanced amplifier and outputs a control signal containing the fundamental wave component or harmonic component of the input power to each of the first and second amplifiers. The control amplifier is positioned between the first and second amplifiers.

Methods and apparatuses for providing a reduction in output power of a balanced amplifier configuration are presented. According to one aspect, reduction of the output power is provided by deactivating one of the two amplification paths of the balanced amplifier. According to another aspect, impedances seen at ports of input and output couplers of the balanced amplifier configuration part of a deactivated amplification path are selectively switched in dependence of operation according to the reduced output power or according to normal output power. In addition, or in the alternative, impedance seen at an isolated / terminated port of the input and / or the output coupler is selectively switched in dependence of the operation. When operating according to the reduced output power, values of the switched impedances can be adjusted to tune a frequency response of the balanced amplifier.

A balanced amplifier is provided with: a signal distribution circuit (2) that distributes a signal to be amplified in two paths, outputs a first signal as one of the two paths of distributed signals, and outputs a second signal as the other of the two paths of distributed signals; a first amplifier (3) that amplifies the first signal output from the signal distribution circuit (2); a second amplifier (6) that amplifies a second signal output from the signal distribution circuit (2); and a combining circuit (7) that combines the first signal amplified by the first amplifier (3) and the second signal amplified by the second amplifier (6). Furthermore, the first amplifier (3) of the balanced amplifier has a first matching circuit for matching the output impedance of the first amplifier (3) to a first impedance, and the first impedance is different from the impedance of a load connected to the output side of the synthesis circuit (7). A second amplifier (6) of the balanced amplifier has a second matching circuit for matching the output impedance of the second amplifier (6) with a second impedance, and the second impedance is different from the impedance of the load. Either the first impedance or the second impedance is higher than the impedance of the load, and the other is lower than the impedance of the load.

A symmetrical amplifier is configured to include: a signal divider circuit (2) to divide a gain target signal into two signals, output a first signal as one of the two divided signals, and output a second signal as another of the two divided signals; a first amplifier (3) to amplify the first signal output by the signal divider circuit (2); a second amplifier (6) to amplify the second signal output by the signal divider circuit (2); and a synthesis circuit (7) to synthesize the first signal, which is amplified by the first amplifier (3), and the second signal, which is amplified by the second amplifier (6).Furthermore, the first amplifier (3) of the balanced amplifier includes a first matching circuit to match the output impedance of the first amplifier (3) to a first impedance that differs from the impedance of a load connected to an output side of the synthesis circuit (7). The second amplifier (6) of the balanced amplifier includes a second matching circuit to match the output impedance of the second amplifier (6) to a second impedance that differs from the impedance of the load. One of the first and second impedances is higher than the impedance of the load, and the other of the first and second impedances is lower than the impedance of the load.

A power amplifier of the present disclosure includes a balanced type amplifier and a control amplifier. The balanced type amplifier includes a first amplifier and a second amplifier to amplify input power. The control amplifier forms a load modulated balanced amplifier together with the balanced type amplifier, and supplies a control signal including a harmonic component of the input power to the balanced type amplifier. The control amplifier is a Class-AB amplifier or a Class-B amplifier. Each of the first amplifier and the second amplifier is a Class-C amplifier.

Apparatuses, systems and methods for operating a power amplifier are described. A controller can drive a power amplifier chain with first input bias voltages to operate the power amplifier chain in a first operation mode that implements a Doherty amplifier. The controller can drive the power amplifier chain with second input bias voltages to operate the power amplifier chain in a second operation mode that implements a balanced amplifier. The controller can tune the termination circuit in accordance with an operation mode of the power amplifier chain.

This invention discloses a single-input broadband load-modulated balanced amplifier and its design method. By employing a single-input configuration, it achieves fully automatic modulation of the load impedance of the load-modulated balanced amplifier, eliminating the need for manual adjustment and testing compared to traditional load-modulated balanced amplifiers. The addition of a dual-impedance pre-matching network brings the transistor load impedance closer to its optimal value, eliminating the need for manual adjustment to the optimal impedance and improving amplifier back-off efficiency. This invention offers advantages over traditional load-modulated balanced amplifiers, including superior performance, ease of application, and convenient measurement.

The invention discloses a wide-backoff load modulation balanced power amplifier based on full-automatic analog amplitude regulation and control, which is characterized in that a full-automatic analog power division ratio regulation and control power divider in the wide-backoff load modulation balanced power amplifier based on full-automatic analog amplitude regulation and control has a first power distribution characteristic; the power division ratio of the two output ends can be automatically adjusted along with power changes, under the low power level, namely before a power amplifier rollback point, only the carrier amplifier works, at the moment, most of power is distributed to the carrier amplifier, under the high power level, namely in a power amplifier rollback area, the carrier amplifier is saturated, and the balance amplifier is not saturated, so that the balance amplifier is not saturated. At the moment, most of the power is distributed to the balance amplifier, the overdrive problem of the carrier amplifier is relieved, the overdrive problem of the carrier amplifier is relieved by reasonably regulating and controlling the power input to the two amplifiers and adopting an asymmetric drain electrode bias mode, and the rollback range of the power amplifier is widened. The method is widely applied to the technical field of wireless communication.

Methods and apparatus are provided. In an example aspect, a method of operating an amplifier circuit is provided. The amplifier circuit comprises a first amplifier configured to receive a first signal, a balanced amplifier comprising second and third amplifiers and configured to receive a second signal, and a first directional coupler. An output of the first amplifier is connected to a transmitted port of the first directional coupler, an output of the second amplifier is connected to an input port of the first directional coupler, an output of the third amplifier is connected to an isolated port of the first directional coupler, and a coupled port of the first directional coupler is connected to an output of the amplifier circuit. The method comprises operating the amplifier circuit in a first output peak amplitude range of the amplifier circuit wherein, in the first output peak amplitude range, the first signal is based on a signal to be amplified and has an amplitude that increases across the first output peak amplitude range from substantially zero to a first amplitude, and the second signal is substantially zero, and operating the amplifier circuit in a second output peak amplitude range of the amplifier circuit, wherein the second output peak amplitude range is higher than the first output peak amplitude range and wherein, in the second output peak amplitude range, the first signal is based on the signal to be amplified and has an amplitude that decreases across the second output peak amplitude range from the first amplitude to a second amplitude, and the second signal is based on the signal to be amplified and has an amplitude that increases across the second output peak amplitude range from a third amplitude to a fourth amplitude.

The present disclosure suppresses oscillations in a power amplifier. The power amplifier includes a balanced amplifier and a control amplifier. The balanced amplifier includes a first amplifier and a second amplifier, and amplifies input power. The control amplifier forms a load modulation balanced amplifier together with the balanced amplifier, and outputs a control signal including a fundamental component or a higher harmonic component of the input power to the first amplifier and the second amplifier, respectively. The control amplifier is disposed between the first amplifier and the second amplifier.

The present invention relates to a RF amplifier circuit arrangement for amplifying at least one RF input signal to an output signal for delivery to a load. The RF amplifier circuit arrangement uses a simple and low-cost RF clipping circuit within a load modulated balanced amplifier arrangement which passes RF input signals to output linearly up to the signal input reaches a predefined amplitude. Beyond that predefined amplitude the clipping circuit clips excess amplitudes. The present invention further relates to an electronic device.