Smarter Microelectronics (Guang Zhou) Co., Ltd.

Zhenfei Peng

Qiang Su

Baiming Xu

Kun Xiang

Jiangtao Yi

Dajie Dai

Xuwen Ni

A bias circuit includes a control loop, configured to output a bias current to the input end of the RF power amplifier; a regulation circuit, configured to adjust loop bandwidth of the control loop based on Miller effect when it is determined that the bias current output by the control loop can meet a first condition, so that stability and noise suppression degree of the control loop can meet a second condition.

Bias circuit and RF power amplifier

A compensation circuit includes a power amplifier, a current bias circuit, a power detection circuit and a current control circuit; the power detection circuit is configured to detect the voltage amplitude of the radio frequency input signal of the power amplifier and output a reference current when the voltage amplitude meets a preset condition; the current control circuit is configured to receive a reference current and output a compensation current to the current bias circuit based on the reference current; the current bias circuit is configured to receive the compensation current and generate the direct-current bias current, and output the compensation current and the direct-current bias current to the power amplifier; and the power amplifier is configured to receive the compensation current and the direct-current bias current, and amplify the power of the radio frequency input signal based on the compensation current and the direct-current bias current.

Compensation circuit

A bias circuit of a power amplifier includes a first part circuit, a second part circuit and a power supply, in which the power supply is connected with a power supply end of the first part circuit; two ends of the first part circuit are connected in parallel with two ends of the second part circuit, and after parallel connection one end of a parallel circuit is connected with a gate of the first transistor of the power amplifier in a signal amplification circuit; the first part circuit is configured to provide a first bias voltage, and the second part circuit is configured to provide a second bias voltage; the two bias voltages are superimposed to provide a stable bias voltage; and an impedance of the bias circuit is in a preset range of the impedance.

Bias circuit of power amplifier, device and equipment

An amplifier includes an amplification circuit, a power supplying circuit and an input circuit. A first end of the amplification circuit is connected with a first end of the input circuit; a second end of the amplification circuit is connected with the power supplying circuit; and a third end of the amplification circuit is connected with a second end of the input circuit. The power supplying circuit is at least configured to supply power to the amplification circuit so that the amplification circuit operates in an amplification region. The input circuit is at least configured to receive an input signal; the amplification circuit is configured to obtain an amplification gain in case of operating in the amplification region, and amplify the input signal by using the obtained amplification gain.

Amplifier and amplification method

In a radio frequency power amplifier with harmonic suppression, one end of an input matching circuit is connected with a radio frequency input end; and another end is connected with a base of a power amplification transistor having a collector connected with a power supply voltage through a first matching branch, and an emitter connected with a first connection point on a package substrate. The collector of the power amplification transistor is connected with a radio frequency output end through a second matching branch that is connected with the package substrate. A harmonic control circuit has a first end connected with the collector of the power amplification transistor, and a second end connected with a second connection point on the package substrate.

Radio frequency power amplifier with harmonic suppression

A radio frequency power amplifier circuit includes a controllable attenuation circuit, an input matching circuit, a drive amplification circuit, an inter-stage matching circuit, a power amplification circuit and an output matching circuit connected in sequence, and respectively configured to switch between a negative gain mode and a non-negative gain mode of the radio frequency power amplifier circuit based on a mode control signal, match the impedance between the controllable attenuation circuit and the drive amplification circuit, amplify a signal, configured to match the impedance between the drive amplification circuit and the power amplification circuit, amplify a signal, and match the impedance between the radio frequency power amplifier circuit and a post-stage circuit. A feedback circuit is connected across the drive amplification circuit, and is configured to adjust a gain.

Radio frequency power amplifier circuit and gain control method

An overvoltage protection and gain bootstrap circuit of a power amplifier includes a power amplification transistor, and a diode reversely connected with a gate of the power amplification transistor. A negative electrode of the diode is connected with the gate of the power transistor, and a positive electrode of the diode is connected with a constant voltage source, such that a function of overvoltage protection and gain bootstrap of the circuit is realized by controlling a turn-on state of the diode. By adding a diode device to the circuit, gate-drain overvoltage protection for the power amplification transistor can be provided, and the gain of the amplifier can be improved before power compression, thereby improving linearity of the power amplifier. The structure of the circuit can be simple, with reduced occupied area hardware cost.

Overvoltage protection and gain bootstrap circuit of power amplifier

A circuit for processing radio frequency signal includes a first path and at least one other second path; herein the first path includes at least one radio frequency amplification device; a first radio frequency current generated by parasitic capacitance of the at least one radio frequency amplification device flows through the at least one second path; the circuit for processing the radio frequency signal further includes at least one resonance module, a first end of each of the at least one resonance module is connected with the first path, and a second end of each of the at least one resonance module is connected with at least a part of second paths of the at least one second path; and the at least one resonance module is configured to generate a resonance current opposite to the first radio frequency current.

Circuit for processing radio frequency signal

A power control circuit includes: a voltage-current converter and a programmable current amplifier; the voltage-current converter is configured to detect an inputted output power control signal, and to convert the output power control signal to a control current and output same; and the programmable current amplifier is configured to receive the control current and output the amplified control current as a bias current of the power amplifier connected to the power control circuit.

Power control circuit and power amplification circuit

A signal amplifier includes one or more driver stage amplifiers and a power stage amplifier. The one or more driver stage amplifiers are connected in series. The one or more driver stage amplifiers and the power stage amplifier are connected to the same power supply, such that each of the at least one driver stage amplifier forms a loop with the power stage amplifier. The signal amplifier can further include a wave trap unit configured to block an oscillation frequency in the loop. One terminal of the wave trap unit is connected to the loop. The other terminal of the wave trap unit is grounded.

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Guangzhou, China

Zhenfei Peng