44 results about "Balanced amplifier" patented technology

A hybrid coupler has a first port, a second port, a third port, and a fourth port to which a load is connected. An input signal distributor distributes a first input signal that is a radio frequency signal into a second input signal and a third input signal. The second input signal is inputted to a balanced amplifier. The balanced amplifier outputs two amplified radio frequency signals with a phase difference of 90° from each other from two output ends, one of which is coupled to the first port and another one of which is coupled to the second port. The control amplifier amplifies the third input signal and outputs the amplified third input signal from an output end. The output end of the control amplifier is coupled to the third port without any circuit component affecting impedance matching disposed in between.

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.

The invention provides a high-frequency power amplifier which can realize miniaturization and broadband. The input signal distributor distributes a high-frequency first input signal into a second input signal and a third input signal. A second input signal is input to the balanced amplifier. And two output ends of the balanced amplifier for outputting two amplified high-frequency signals with a phase difference of 90 degrees are respectively coupled with the first port and the second port. And the control amplifier amplifies the third input signal and outputs the amplified signal from the output end. The output of the control amplifier is coupled to the third port without via a circuit component that affects impedance matching. The balanced amplifier and the control amplifier are supplied with a common power supply voltage. The voltage level of the first input signal when the current output from the control amplifier rises is higher than the voltage level of the first input signal when the current output from the balance amplifier rises. The hybrid coupler varies a load impedance of a balanced amplifier coupled to the first and second ports in accordance with a current level of a high-frequency signal input from the control amplifier to the third port.

A power amplifier and a method of controlling a power amplifier are described. The power amplifier (300) comprises a hybrid combiner (310) comprising a first input port and a second input port, an isolated port and an output port, wherein the hybrid combiner (310) delivers an output power at the output port. A balanced amplifier arrangement (320) is comprised, the balanced amplifier arrangement (320) comprising a main amplifier arrangement, a first peaking amplifier and a second peaking amplifier, wherein the output of the main amplifier arrangement and the outputs of the first and second peaking amplifiers are coupled to the first and second input ports of the hybrid combiner (310) to provide the output power at the output port. A third peaking amplifier (330) has an output coupled to the isolated port of the hybrid combiner (310). A peaking signal distribution circuit distributes a peaking amplification signal to the input ports of the first, second and third peaking amplifiers.

The invention relates to a load modulation balanced power amplifier with low loss and high rollback efficiency, and the power amplifier comprises a signal distribution module which is used for dividing an input signal into three paths of signals; the control power amplifier module is used for amplifying the first path of signals and outputting the signals through a 3dB quadrature coupler of the balance power amplifier module before the amplitudes of the second path of signals and the third path of signals reach threshold values respectively; after the amplitudes of the second path of signal and the third path of signal respectively reach threshold values, inputting the amplified first path of signal into a balanced amplifier module so as to control the output impedance of the balanced amplifier module; and the balanced power amplifier module is used for amplifying the second-path signal and the third-path signal with different amplitudes and phases after the amplitudes of the second-path signal and the third-path signal respectively reach threshold values, and coupling and outputting the first-path signal, the second-path signal and the third-path signal through a 3dB orthogonal coupler.

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.

The present application relates to the technical field of radio frequency chip power amplifiers, and specifically to a high-gain load-modulated balanced amplifier, comprising: an RF input connected to the input end of a power divider, a first output end of the power divider connected to the input end of a phase shifter, a second output end of the power divider connected to the input end of an input coupler, an output end of the phase shifter connected to a control power amplifier, and an output end of the control power amplifier connected to an isolation end of the input coupler; a through-end of the input coupler connected to the input end of a first sub-balanced amplifier, a coupling end of the input coupler connected to the input end of a second sub-balanced amplifier, and an output end of the first sub-balanced amplifier connected to a coupling end of an output coupler; an output end of the second sub-balanced amplifier connected to a through-end of an output coupler; an isolation end of an output coupler connected to a reactance load, the other end of the reactance load being grounded; and an input end of the output coupler connected to an RF output, so that only a very low-power control signal is required to meet the requirements.

The invention provides an active load modulation balanced radio frequency power amplifier. The active load modulation balanced radio frequency power amplifier comprises a high-pass filter, a phase shifter and an attenuator, the isolation end of the output 3dB coupler is sequentially connected with a high-pass filter, a phase shifter and an attenuator; the output end of the attenuator is respectively connected with the two input matching networks; the two input matching networks are connected with the input 3dB coupler and the group of balanced power amplifiers. According to the application, the characteristics of an active load modulation balanced amplifier are utilized, fundamental waves and second harmonics are isolated through the high-pass filter, the phase of the second harmonics is adjusted through the phase shifter, the amplitude of the second harmonics is adjusted through the attenuator, then the second harmonic signals are injected into the power amplifier, active devices are not needed in the harmonic injection process, and the harmonic injection efficiency is improved. The harmonic injection circuit is realized only by using a low-cost passive circuit, so that the cost is effectively reduced, and the circuit area is reduced.

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.

This power amplifier is provided with a carrier amplifier module (5), a balanced amplifier module (4), a first delay line (80), and a second delay line (81). The thermal resistance in the first amplifier (10) from the active element (12) to the back side of the package is less than the thermal resistance from the active element (22) of the second amplifier (20) and the active element (32) of the third amplifier (30) to the back side of the package. The sum of the electrical length from the input terminal (2) to the first internal output terminal (90) and the electrical length from the first internal input terminal (91) to the output terminal (3) is equal to the sum of the electrical length from the input terminal (2) to the second internal output terminal (92) and the electrical length from the second internal input terminal (93) to the output terminal (3). The first delay line (80) and the second delay line (81) have the same electrical length.

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.

The invention discloses a bidirectional amplifier structure with a low noise coefficient and high output power. According to the amplifier, the functions of a power amplifier and a low noise amplifier in a duplex system are realized by utilizing the structure of a load modulation balanced amplifier. Multiple coupling transformers are introduced into a control circuit input and output matching network, so that redundant loss caused by a quadrature coupler is avoided, and excellent noise coefficient and gain performance of an LNA mode are realized under the condition of ensuring high output power and high efficiency of a PA mode. According to the circuit, the input / output network of a control circuit is improved on the basis of the original architecture, so that better performance of the bidirectional amplifier is realized.

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.

Aspects of this disclosure relate to a multi-stage pseudo-Doherty load modulated balanced amplifier that includes a control stage and balanced stages. The balanced stages can each include a balanced amplifier biased in class C. The balanced stages can each include an output coupler having a port driven by another stage of the multi-stage pseudo-Doherty load modulated balanced amplifier. In certain embodiments, two or more stages of the multi-stage pseudo-Doherty load modulated balanced amplifier are driven by separate drive signals.

A multiple-mode RF power amplifier includes two power amplifiers, output combiner circuitry, and a switchable impedance circuit. The power amplifiers receive first and second input RF signals and produce first and second amplified RF signals. The output combiner circuitry combines the amplified RF signals to produce a combined amplified RF signal. The switchable impedance circuit has an input terminal coupled to an isolated port of the output combiner circuitry. When the switchable impedance circuit is in a first state, the isolated port is coupled through the switchable impedance circuit to a first impedance to configure the multiple-mode RF power amplifier as a balanced amplifier. When the switchable impedance circuit is in a second or third state, the isolated port is coupled through the switchable impedance circuit to a second or third impedance to configure the multiple-mode RF power amplifier as a first or second type of Doherty power amplifier.

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.

The invention discloses a low-temperature-drift-coefficient voltage reference source with load driving capacity. The low-temperature-drift-coefficient voltage reference source comprises a temperature negative correlation circuit, an unbalanced amplifier, a time domain amplifier and a voltage superposition main branch. According to the invention, the temperature negative correlation circuit and the improved unbalanced amplifier are combined, so that the nonlinear term related to the temperature in the output voltage is greatly reduced, a very small temperature coefficient is achieved, and an additional starting circuit is not needed. In addition, by adopting the stacked NMOS structure, the output voltage is effectively reduced along with process deviation; by adopting the time domain amplifier, high gain, low power consumption and 20mA load driving capability are realized under the lowest low power supply voltage of 0.9 V.

The utility model provides a radio frequency power amplification circuit based on a balanced power amplification structure, which comprises a first orthogonal coupler, a second orthogonal coupler, a third orthogonal coupler and a fourth orthogonal coupler, the first balance amplification module receives one path of orthogonal radio frequency signal and outputs a first amplification signal; the second balance amplification module is used for receiving the other path of orthogonal radio frequency signal and outputting a second amplification signal; a second quadrature coupler receiving the first amplified signal and the second amplified signal which are orthogonal and generating a single-ended radio frequency output; wherein the first quadrature coupler comprises an input transformer comprising a first winding and a second winding, an input capacitor and an input resistor, the first winding is connected between the single-ended radio frequency input and the input end of the first balanced amplification module, and the input capacitor is connected between the single-ended radio frequency input and the input end of the second balanced amplification module. One end of the second winding is connected between the input capacitor and the input end of the second balance amplification module, and the other end of the second winding is grounded through the input resistor.

The invention relates to a method for operating a power supply system (2), the power supply system (2) having a power converter (3) which generates an HF power signal and is connected to a load (6) in order to supply power to a plasma or gas laser process, the power converter (3) comprising at least one amplifier stage (40) which is designed as a balanced amplifier having a first and a second amplifier unit (42a, 43a) which each have the following components: i. a base-load amplifier (103) configured to provide a base-load amplifier power; ii. a peak-load amplifier (104) configured to provide a peak-load amplifier power; and iii. a power coupler (107) for combining the base-load amplifier power and the peak-load amplifier power at the output of the respective first and second amplifier unit to form an amplifier output power (Pout), the method comprising the following method steps: - in order to generate a power increase above the continuous-operation power of the power supply system (2), an amplitude and / or phase relationship between the base-load amplifier (103) and the peak-load amplifier (104) of at least one of the first and second amplifier units is set in such a way that the amplifier output power (Pout) of the amplifier unit is greater than a continuous-operation power of the amplifier unit (42a, 43a).

The invention discloses a dual-polarization amplifying circuit structure which is based on balanced amplifier topology, a single-pole double-throw switch is arranged in front, input and output ports are switched through the single-pole double-throw switch, and then the coupling characteristic between the ports of a Lange bridge is utilized to achieve dual-polarization output. Compared with a traditional dual-polarization amplification circuit structure, the circuit structure avoids introduction of a polarization switch in final-stage matching of the amplifier, switch loss is omitted, and the efficiency of the amplifier is improved; moreover, the natural high isolation characteristic between the Lange bridge output port and the isolation port reduces the mutual interference between the dual-polarization channels, eliminates the cross polarization leakage, and greatly improves the performance of the dual-polarization amplifier.

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.

Method for operating a power supply system (2), wherein the power supply system (2) comprises a power converter (3) generating an RF power signal, which is connected to a load (6) for supplying power to a plasma or gas laser process, wherein the power converter (3) comprises at least one amplifier stage (40) configured as a balanced amplifier with a first and second amplifier unit (42a, 43a), each comprising: i. a base-load amplifier (103) configured to provide base-load amplifier power; ii. a peak-load amplifier (104) configured to provide peak-load amplifier power; and iii. a power coupler (107) for combining the base-load amplifier power and the peak-load amplifier power at the output of the respective first and second amplifier units.second amplifier unit to an amplifier output power (Pout) wherein the method comprises the following process steps: - to generate a power boost above the rated power of the power supply system (2) an amplitude and / or phase relationship between the base load amplifier (103) and the peak load amplifier (104) of at least one of the first and second amplifier units is set such that the amplifier output power (Pout) of the amplifier unit is greater than a rated power of the amplifier unit (42a, 43a).

A method and apparatus are disclosed for providing therapeutic electric current to a treatment site of a patient. The steps of the method comprise generating a first and second signal having a frequency difference between 1 Hz and 300 Hz, wherein each signal has a frequency of at least 1 KHz and are amplified by Class D switching amplifiers, minimizing the DC component of the first and second signals using balanced amplifiers; operatively coupling a first electrode of at least one pair of electrodes to a patient's body on or beneath a first epidermal or mucous membrane surface; operatively coupling a second electrode of at least one pair of electrodes to a patient's body on or beneath a second epidermal or mucous membrane surface; forming a therapeutic signal configured to reduce pain at a treatment site by simultaneously sending a first signal from the first electrode to the second electrode and sending a second signal from a second electrode to the first electrode, and then simultaneously sending the first signal from the second electrode back to the first electrode and the second signal from the first electrode back to the second electrode, wherein the first and second signals are linearly independent off phase alternating current signals; and adjusting the therapeutic signal utilizing a feedback system based on impedance changes within the patient's body.

A dual-amplifier system is provided that may comprise a balanced amplifier or a load-modulated balanced amplifier. The dual-amplifier system includes a first amplifier for amplifying a first RF signal into an amplified first RF signal and includes a second amplifier for amplifying a second RF signal into an amplified second RF signal. An impedance-transforming quadrature hybrid combiner is configured to receive the amplified first RF signal and the amplified second RF signal to combine them into an RF output signal.

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.