150results about "Phase-splitters" patented technology

Apparatus and methods for reconfigurable power amplifiers are disclosed. In certain embodiments, a mobile device includes a transceiver configured to generate a first radio frequency signal of a first frequency band and a second radio frequency signal of a second frequency band, and a front-end system including a push-pull power amplifier configured to selectively amplify one of the first radio frequency signal or the second radio frequency signal based on a band control signal. The push-pull power amplifier includes an input balun, an output balun, and a pair of amplifiers coupled between the input balun and the output balun. The band control signal is operable to control an output capacitance of the pair of amplifiers.

The invention discloses a high-voltage power amplifier with an over-temperature and over-current protection circuit, and relates to the technical field of integrated circuits. The high-voltage operational amplifier comprises a high-voltage operational amplifier core unit and a self-adaptive protection circuit unit, the high-voltage operational amplifier core unit comprises a rail-to-rail input stage, a gain amplification stage and an AB type push-pull output stage which are sequentially cascaded, and the AB type push-pull output stage comprises a PMOS upper power tube and an NMOS lower power tube; the self-adaptive protection circuit unit comprises a PMOS (P-channel Metal Oxide Semiconductor) current-limiting protection circuit, an NMOS (N-channel Metal Oxide Semiconductor) current-limiting protection circuit and an over-temperature protection circuit; the PMOS current-limiting protection circuit is used for generating a high-voltage domain over-current control signal when the power tube on the PMOS is over-current; the NMOS current-limiting protection circuit is used for generating a low-voltage domain overcurrent control signal when the NMOS lower power tube is in overcurrent; the over-temperature protection circuit is used for generating high-voltage domain over-temperature turn-off signals and low-voltage domain over-temperature turn-off signals when the amplifier is over-temperature; and finally, carrying out logic synthesis on the corresponding over-current control signal and the over-temperature turn-off signal to generate a gate clamping signal.

An amplifier circuit including a first amplifier having a first amplifier input and a first amplifier output and a transformer including a first transformer component having a first primary winding in series with the first amplifier output and a first secondary winding coupled to the first amplifier input. The first primary winding and the first secondary winding are arranged such that a portion of a first magnetic field generated by the first primary winding couples to the first secondary winding through a first magnetically coupled feedback loop. The transformer further includes a second transformer component having a second primary winding in series with an output of a second amplifier and a second secondary winding coupled to an input of the second amplifier input. A portion of a second magnetic field generated by the second primary winding couples to the second secondary winding through a second magnetically coupled feedback loop.

Apparatus and methods for reconfigurable power amplifiers are disclosed. In certain embodiments, a mobile device includes a transceiver configured to generate a first radio frequency signal of a first frequency band and a second radio frequency signal of a second frequency band, and a front-end system including a push-pull power amplifier configured to selectively amplify one of the first radio frequency signal or the second radio frequency signal based on a band control signal. The push-pull power amplifier includes an input balun, an output balun, and a pair of amplifiers coupled between the input balun and the output balun. The band control signal is operable to control an input capacitance of the pair of amplifiers.

The invention belongs to the technical field of integrated circuits, and particularly relates to an open-loop residual amplifier circuit applied to a pipelined successive approximation type ADC. Comprising a differential input circuit, a tail current circuit, a third PMOS (P-channel Metal Oxide Semiconductor) tube Mp3, a fourth PMOS tube Mp4, a third NMOS (N-channel Metal Oxide Semiconductor) tube Mn3 and a fourth NMOS tube Mn4, the third PMOS tube Mp3, the fourth PMOS tube Mp4, the third NMOS tube Mn3 and the fourth NMOS tube Mn4 are all connected with the differential input circuit; the tail current circuit is connected with the third NMOS tube Mn3 and the fourth NMOS tube Mn4; a high open-loop gain does not need to be designed, a complex common-mode voltage detection circuit is not needed, the circuit structure is simple, the circuit design difficulty is reduced, the circuit is a dynamic circuit, the circuit power consumption is greatly reduced, and the circuit is suitable for low-power-consumption ADC design; the analog-to-digital converter adopts a push-pull input mode, greatly improves the input transconductance, has the characteristic of large bandwidth, and is suitable for high-speed ADC (Analog-to-Digital Converter) design.

A radio frequency (RF) power amplifier based on transformer matching is provided. The RF power amplifier includes: a first-stage amplification circuit configured with an input terminal and an output terminal, wherein the output terminal of the first-stage amplification circuit is configured to be connected to one terminal of a main coil of a first transformer; the first transformer configured to include the main coil and a secondary coil, wherein one terminal of the secondary coil is grounded and the other terminal of the secondary coil is connected to a medium-low power mode input terminal of a power switch; the second-stage amplification circuit configured with an input terminal for receiving the amplified RF signal from the first-stage amplification circuit, wherein an output terminal of the second-stage amplification circuit is configured to be connected to a high power mode input terminal of the power switch.

Embodiments of the present disclosure include adaptive bias control of cascode drivers in envelope tracking power amplifier devices, systems, and methods. In some aspects, a wireless communication device is disclosed that includes a power amplifier. The power amplifier may include a driver stage configured to receive a variable voltage supply signal, and a power amplifier stage following the driver stage. In some embodiments, the driver stage includes a cascode gate bias circuit configured to receive a first signal that is based on the variable voltage supply signal; and a cascode amplifier stage comprising a first field effect transistor (FET) and a second FET in a stacked configuration. The cascode gate bias circuit may be further configured to adaptively convert the first signal into a bias signal for a gate of the first FET. The power amplifier stage may be configured to generate an amplified signal based on the intermediate output.

The present technology relates to an electronic circuit, a solid-state imaging device, and a readout circuit that make it possible to reduce power consumption. An electronic circuit comprises a push-pull buffer circuit, the push-pull buffer circuit including a switch for performing intermittent signal output and a bypass current circuit for forming a bypass current path when the signal output is temporarily halted. The present technology can be applied to solid-state imaging devices.

To suppress the surge voltage of the first surge voltage caused by square waves and the second surge voltage caused by harmonic frequency components, to broaden the frequency characteristics of the output of the switching amplifier and to make the output frequency variable.SOLUTION: A switching amplifier in push-pull configuration with narrow bandwidth filter on the output side comprises a partial resonance circuit to suppress the first surge voltage caused by square waves and a LCR series resonator to suppress the second surge voltage caused by harmonic frequency components, and the waveform shape of the drain-source voltage Vds of the switching element is a trapezoidal waveform.SELECTED DRAWING: Figure 1

To provide a push-pull output circuit capable of suppressing increase in the number of components and complication of wiring, and of preventing a transistor from being in saturated with certainty.SOLUTION: A push-pull output circuit 10 comprises: a diode-connected bipolar transistor Q1 that configures a current mirror circuit; a bipolar transistor Q2 whose base terminal is connected with a base terminal of the bipolar transistor Q1; a constant current source Io; a diode D4 whose anode terminal is connected with a collector terminal of the bipolar transistor Q1 and whose cathode terminal is connected with the constant current source; and a lateral bipolar transistor Q3 whose base terminal is commonly connected with the base terminal of the bipolar transistor Q1 and the base terminal of the bipolar transistor Q2, one of whose emitter and collector terminals is connected with the cathode terminal of the diode, and the other of whose emitter and collector terminals is connected with a collector terminal of the bipolar transistor Q2.SELECTED DRAWING: Figure 1

The present application provides a kind of power amplifier circuit and semiconductor device.Power amplifier circuit has the 1st amplifier of signal distribution from input signal is amplified, the 2nd amplifier of signal with different phase is amplified, the 3rd amplifier, the 4th amplifier and matching circuit, matching circuit has: the 1st wiring, with the output terminal of the 1st amplifier is connected with the 1st end and the input terminal of the 3rd amplifier is connected with the 2nd end;The 2nd wiring, with the input terminal of the 3rd amplifier is connected with the 1st end and the 2nd end of power supply is connected, and with the 1st wiring is electromagnetically coupled;The 3rd wiring, with the output terminal of the 2nd amplifier is connected with the 1st end and the input terminal of the 4th amplifier is connected with the 2nd end;And the 4th wiring, with the input terminal of the 4th amplifier is connected with the 1st end and the 2nd end of power supply is connected, and with the 3rd wiring is electromagnetically coupled.

This invention belongs to the field of analog integrated circuit technology, specifically to a Class-AB output stage bias circuit with low mismatch and stable output current, suitable for fully differential circuits. This invention provides a bias circuit for the Class-AB output stage with extremely low current mirror mismatch, overcoming the mismatch caused by channel length modulation. Furthermore, when the output common mode changes, the bias circuit can adapt accordingly, providing a new bias, thereby minimizing the impact of common-mode voltage changes on the output stage's quiescent current.

The radio-frequency power supply device of the present invention comprises: a radio-frequency amplification unit that carries out radio-frequency amplification by the switching operation of amplifying elements; and a gate drive unit that inputs a gate signal to the gate terminals of the amplifying elements in the radio-frequency amplification unit to drive the amplifying elements. The amplifying elements in the radio-frequency amplification unit are LDMOSFETs, and the switching elements in the gate drive unit are GaNFETs. By utilizing LDMOSFETs as the amplifying elements, a high-output / high-frequency radio-frequency is output, and by utilizing GaNFETs as the switching elements, individual differences in propagation delay in the switching elements are reduced, and the fluctuation in the dead time DT and pulse width Ton of the gate signal for carrying out PWM control are suppressed to improve accuracy and reproducibility, to improve high-speed response characteristics, and to suppress high-frequency resonance.

The application discloses a kind of low noise and high gain bandwidth product operational amplifier circuit, it is related to the technical field of electronic circuit, it solves the technical problem of the low noise and high gain bandwidth product operational amplifier circuit urgently needed at present.The circuit includes input stage, bias stage and output stage connected in turn;The output stage is push-pull structure, the bias stage is used to provide bias for the output stage;Feedback loop is arranged between the bias stage and the output stage, for determining the current of the output stage;Phase compensation stage is arranged between the feedback loop and the output stage, for providing phase compensation for output stage.The application not only can reduce the noise of circuit output stage, but also can improve the gain bandwidth product of operational amplifier.

The application discloses a push-pull power amplifier circuit and a radio frequency front end module. The push-pull power amplifier circuit comprises a first bias circuit, a second bias circuit, a first push-pull power amplifier branch, a second push-pull power amplifier branch and an impedance adjusting circuit. The output end of the first bias circuit is coupled to the input end of the first push-pull power amplifier branch. The output end of the second bias circuit is coupled to the input end of the second push-pull power amplifier branch. One end of the impedance adjusting circuit is coupled to the output end of the first bias circuit, and the other end of the impedance adjusting circuit is coupled to the output end of the second bias circuit. The technical scheme can improve the linearity of the push-pull power amplifier circuit.

Disclosed is an amplifier having a carrier amplifier configured as a common-emitter carrier power stage and a peaking amplifier configured as a common-emitter peaking power stage. Further included is power adaptive biasing circuitry coupled between the carrier amplifier and the peaking amplifier, wherein the power adaptive biasing circuitry is configured to sense direct current base voltages of the common-emitter carrier power stage and to generate control currents that debias the common-emitter carrier power stage in response to the current base voltages of the common-emitter carrier power stage.

The invention belongs to the technical field of semiconductor hybrid integrated circuits, and discloses a broadband high-voltage transconductance derivative amplifier which comprises a component carrier, a two-stage amplifier is arranged on the component carrier, and a shell is arranged on the outer side of the component carrier. The two-stage amplifier comprises a first-stage common-emitter amplifying circuit topological structure and a second-stage push-pull output topological structure, the first-stage common-emitter amplifying circuit topological structure comprises a transistor for amplifying an input signal, and the transistor is connected with a bias circuit; the second-stage push-pull output topological structure receives an electrode signal amplified by the transistor, then carries out power amplification and outputs the signal to an output end, and a feedback circuit is connected between the first-stage common-emitter amplification circuit topological structure and the second-stage push-pull output topological structure, so that the amplifier has the characteristics of wide bandwidth and high voltage output; meanwhile, the working stability and reliability are guaranteed, and the requirements of the aerospace field for the performance and structure of the amplifier are met.

The invention discloses a low-noise and high-gain-bandwidth-product operational amplifier circuit, relates to the technical field of electronic circuits, and solves the technical problem that the low-noise and high-gain-bandwidth-product operational amplifier circuit is urgently needed at present. The circuit comprises an input stage, a bias stage and an output stage which are connected in sequence, the output stage is of a push-pull structure, and the bias stage is used for providing bias for the output stage; a feedback loop is arranged between the bias stage and the output stage and is used for determining the current of the output stage; and a phase compensation stage is arranged between the feedback loop and the output stage and is used for providing phase compensation for the output stage. Noise of the circuit output stage can be reduced, and the gain bandwidth product of the operational amplifier can be improved.

Implementations and methods of an audio amplifier having a special function of driving a speaker without generating electro-acoustic noise are described herein. The phenomenon is inherent in an analog circuit, and is caused by the propagation of sound and heat when an audio signal acts on a circuit element material. The structure which is more resistant to electromechanical stress is not easy to generate such noise, and the appropriate circuit can also eliminate the residual effect. Compared with the prior art, the tone quality is greatly improved, and a music player has a greater degree of freedom in the aspect of tone research and can play music more easily. Similar improvements are also obtained when the invention is used for driving loudspeakers of music making studios and all applications requiring optimal sound quality.

A push-pull radio frequency power amplifier includes a coupling feedback circuit, a drive stage circuit and a power output stage circuit, in which the coupling feedback circuit is connected with the drive stage circuit and / or the power output stage circuit; the coupling feedback circuit is configured to generate an alternating voltage at an input end of a first transistor and / or an input end of a push-pull transistor; when the alternating voltage and a voltage at the input end are in a same direction, a positive feedback of an input signal at the input end is achieved; and the first transistor represents a transistor in the drive stage circuit and the push-pull transistor represents a second transistor and a third transistor that form a push-pull structure in the power output stage circuit.

The invention relates to the field of semiconductor integrated circuit design, in particular to an output current boosting circuit based on a complementary push-pull output structure, which comprises an output-stage core circuit, a fan-out current boosting circuit and an injection current boosting circuit, and is characterized in that the fan-out current boosting circuit is used for boosting the fan-out current capability of the output-stage core circuit; the injection current boosting circuit is used for boosting the injection current capability of the output-stage core circuit; based on a bipolar process, the invention provides the output current boosting circuit based on the complementary push-pull output structure, and the output current can be boosted by about 6 times with extremely low power consumption on the premise of not influencing the amplitude of the output voltage and basically not increasing extra power consumption.

The power mode is switched without providing a switch for switching the power mode. The power amplifier circuit includes: a first differential power amplifier including a first power amplifier and a second power amplifier; a first balun provided on the input side of the first differential power amplifier; a second balun provided on the output side of the first differential power amplifier; and a bias circuit that supplies a bias to the first differential power amplifier, the first balun includes a primary winding and a secondary winding that are electromagnetically coupled to each other, and a midpoint of the primary winding and the secondary winding of the first balun that is close to the secondary winding of the first differential power amplifier is connected to a reference potential. The bias circuit supplies bias to both the first power amplifier and the second power amplifier in a high-power mode, and supplies bias to one of the first power amplifier and the second power amplifier and does not supply bias to the other in a low-power mode.

An electronic tube-transistor hybrid output stage is characterized by the fact that both a tube and a transistor system simultaneously perform the amplification of a signal.

A power amplifier system for amplifying a radio frequency signal can have a driver transistor coupled to a radio frequency signal input. The system can also have a transformer balun with a main primary coil connected between the driver transistor and a voltage supply node of the power amplifier system, a secondary coil magnetically coupled to the main primary coil, and an additional primary coil configured to generate a feedback signal related to a signal induced in the main primary coil. A neutralization diode can be configured to use the feedback signal to reduce a gain variation resulting from variations in a voltage supplied from the voltage supply node of the power amplifier system. The neutralization diode can be connected between the additional primary coil and the driver transistor. Through envelope tracking, voltage supplied through the voltage supply node can change in relation to an envelope of the radio frequency signal.

A radio frequency circuit includes a transmit power amplifier, a differential transmit signal path having first and second paths, and first and second baluns. The first balun can be configured to convert a single ended transmit signal into a differential transmit signal, and the second balun can be configured to convert the differential transmit signal back to a single ended transmit signal. The circuit can also include a pair of transmit filters between the first and second baluns and including a first transmit filter connected in the first path and a second transmit filter connected in the second path. The second balun cancels harmonic noise generated by the pair of transmit filters.

Provided is a differential amplification device that enables downsizing of the device. A differential amplification device (1) includes: an input matching circuit (MN1) that is an input balun of a signal input at an input terminal; an output matching circuit (MN2) that is an output balun of a signal output to an output terminal; a first amplifier (11) and a second amplifier (12) that are connected in parallel between the input balun and the output balun and output a differential signal; a first diode (D1) that is provided between a path between the input balun and the first amplifier and a reference potential; a second diode (D2) that is provided between a path between the input balun and the second amplifier and the reference potential; and a bias circuit (21) that applies a bias to the first diode and the second diode, with the cathode of the first diode and the cathode of the second diode connected to the reference potential side.

The present invention discloses a push-pull power amplifier circuit, comprising a first differential amplifier transistor and a second differential amplifier transistor, a first LC resonant circuit, a second LC resonant circuit, a third capacitor, a fourth capacitor and a first balun; the output end of the first differential amplifier transistor is coupled to the first input end of the first balun through the third capacitor, the output end of the second differential amplifier transistor is coupled to the second input end of the first balun through the fourth capacitor, the first end of the first LC resonant circuit is connected to the output end of the first differential amplifier transistor, the second end of the first LC resonant circuit is connected to the ground end, the first end of the second LC resonant circuit is connected to the output end of the second differential amplifier transistor, and the second end of the second LC resonant circuit is connected to the ground end; thereby improving the working efficiency and linearity of the push-pull power amplifier circuit, and optimizing the overall performance of the push-pull power amplifier circuit in the entire working frequency band.

The invention belongs to the field of integrated circuits, and particularly relates to a JFET (Junction Field Effect Transistor) input operational amplifier suitable for high-speed weak current detection, which comprises a first biasing circuit, a second biasing circuit, a third biasing circuit, a fourth biasing circuit, a fifth biasing circuit and a sixth biasing circuit, the product of the gain of the differential input stage circuit and the gain of the intermediate amplification stage circuit is used as the gain of the amplifier, the complementary push-pull output stage circuit and the intermediate amplification stage circuit adopt a folded common-emitter common-base structure with emitter feedback, and the intermediate amplification stage circuit converts two differential signals output by the differential input stage circuit into single-ended signals. The complementary push-pull output stage circuit further converts the single-ended signal into an output signal of the amplifier. The problems of a trans-impedance amplifier with high gain bandwidth product, high slew rate, low noise and low input bias current required during high-speed weak current detection in the prior art are solved.

Described is a noise-cancellation amplifier (200), comprising a first inductor system with a first inductor (L1) and a second inductor (L2); a second inductor system with a third inductor (L3) and a fourth inductor (L4); a first transistor (T1) being coupled with the third inductor (L3); a second transistor (T2) being coupled with the fourth inductor (L4); and a third inductor system with a fifth inductor (L5) and a sixth inductor (L6), the fifth inductor (L5) being coupled with a gate of the first transistor (T1) and the sixth inductor (L6) being coupled with a gate of the second transistor (T2); wherein the first inductor system is inductively coupled with the second inductor system and the second inductor system is inductively coupled with the third inductor system. In this way, a noise cancellation effect of the noise cancellation amplifier (200) may be improved.