4 results about "Automatic gain controller" patented technology

The application relates to a D-class audio power amplifier capable of self-adapting to improve light-load efficiency and reduce static current, which comprises an audio input module, an operational amplifier unit, a pulse width modulator and a power control module connected in sequence, wherein the operational amplifier unit and the power control module are connected with an automatic gain controller, and the pulse width modulator is connected with an oscillator; the power control module comprises a driving circuit, an adaptive power supply connected with the driving circuit and a full-bridge power tube; the driving circuit is connected with the pulse width modulator, and the full-bridge power tube is connected with the automatic gain controller. The adaptive power supply adjusts the power supply voltage of the driving circuit and the full-bridge power tube according to the size requirement of the audio output power, adaptively changes the gate voltage size of the full-bridge power tube, and reduces the power consumption of the circuit in the light load. The driving circuit adaptively adjusts the parallel number of the full-bridge power tube by detecting the size of the input voltage and the load power, reduces the static current, and improves the light-load efficiency.

The application discloses a kind of gain calculator and automatic gain control system.The gain calculator includes: gain calculation unit, for generating initial gain coefficient according to the gain signal corresponding to the output signal of variable gain amplifier;Polarity judging unit, for generating polarity signal according to the feedback signal of digital automatic gain controller;Hysteresis control unit, for generating gain coefficient adjustment value according to polarity signal;Gain adjustment unit, for generating gain coefficient according to initial gain coefficient and gain coefficient adjustment value.The technical scheme of the embodiment, by adding polarity judging unit, hysteresis control unit and gain adjustment unit, to generate corresponding gain coefficient adjustment value to correct gain coefficient when detecting that the signal strength of gain signal is abnormal, so as to adjust the signal strength of gain signal, which can realize effective correction of gain coefficient, and can ensure that the signal strength of gain signal is located in the working interval supported by digital automatic gain controller.

An automatic gain controller includes multiple resistors, multiple switches, a buffer, a charge pump circuit and a voltage level shifter. The resistors are connected in series between an input terminal for receiving an input signal and an inverting input terminal of an operational amplifier. Each of the switches has a first terminal coupled to a corresponding one of the resistors, and a second terminal coupled to the inverting input terminal. The switches are respectively controlled by multiple switching signals so as to be turned on or turned off. The buffer generates a buffer signal according to the voltage at the inverting input terminal. The charge pump circuit generates a boost voltage according to the buffer signal and a clock signal. The voltage level shifter converts voltage levels of multiple control signals according to the buffer signal and the boost voltage to generate and respectively output the switching signals to the switches.

A method (100) for a multi-antenna transmitter and receiver arrangement, MATARA, (300), the MATARA (300) comprising two or more antennas (301, 302,..., 316), two or more transceiver front ends (320, 321,..., 328) each comprising two or more transceivers, and two or more automatic gain controllers, AGCs, (330, 331,..., 338) and wherein the MATARA (300) is comprisable in a wireless device, WD, (397), the method comprising: receiving (110) a first plurality of radio signals comprising a first signal transmitted from a remote TNode (398, 399); obtaining (120) a signal power estimate for each of the first plurality of radio signals; obtaining (130) information about correlation between characteristics of the radio signals received by the transceivers; grouping (140) transceivers together in groups of transceivers in accordance with the obtained information; and configuring (150) the AGCs in accordance with the obtained signal power estimates and in accordance with the groups of transceivers. Corresponding computer program product, multi-antenna transmitter and receiver arrangement, control unit, wireless device, and chips are also disclosed.