The present invention provides an RF power amplifier architecture which with dynamic digital control of the amplification by incorporating digitized RF input and output signal envelope data and environmental temperature sensor(s) readings into an arbitrary control algorithm implemented on a digital processor. Via the combination of digitally controlled DC/DC converter and a D/A converter, the quiescent bias of the power FET of the RF output stage can become a realization of virtually any function of the feedback and input data.

A power amplifier circuit includes a power amplifier that amplifies the power of a high frequency signal, a power amplifier temperature detector circuit that includes a temperature detection element, the temperature detection element being thermally coupled with the power amplifier, a bias control signal generator circuit that generates a bias control signal for the power amplifier based on a temperature detection signal outputted from the power amplifier temperature detector circuit, and a regulator circuit that stabilizes the temperature detection signal. The power amplifier, the power amplifier temperature detector circuit, and the regulator circuit are formed in a first integrated circuit, and the bias control signal generator circuit is formed in a second integrated circuit. The substrate material (for example, GaAs) of the first integrated circuit has a higher cutoff frequency than the substrate material (for example, SOI) of the second integrated circuit.

There is disclosed an amplifier circuit comprising: an amplifier having input and output terminals; a temperature dependent variable impedance unit comprising: a first terminal, a second terminal and a variable impedance unit control terminal; a transistor comprising a transistor control terminal coupled to the variable impedance unit control terminal; a first resistor coupled in parallel with the conduction channel; a capacitor coupled in series with the conduction channel between the conduction channel and one of: the first terminal; and the second terminal; and wherein: the first terminal is coupled to one of: the input terminal and the output terminal; the second terminal is for coupling to a reference node; and the variable impedance unit control terminal is configured to receive a control signal that is based on a measured temperature indicative of a temperature of the amplifier circuit and thereby provide a temperature dependent variable impedance for the amplifier circuit.

A radio-frequency module includes a module substrate, a power amplifier, and a control circuit configured to control the power amplifier. The control circuit includes a temperature sensor. The power amplifier and the control circuit are stacked one on top of another on a principal surface of the module substrate.

A temperature compensation circuit for a power amplifier is provided, wherein data of circuit configurations corresponding to specific temperatures (including data associated with an output terminal voltage, a bias voltage, an adaptive bias, and a matching impedance of the power amplifier) for the power amplifier is stored in a read-only memory. Therefore, the temperature compensation circuit is capable of reading the data according to a temperature sensing signal to adjust the circuit configuration of the power amplifier accordingly, thereby, in a case of a constant input power of the power amplifier, an output power variance of the power amplifier is within a second interval (e.g., −10%˜+10%) when an environment temperature varies within a first interval. Therefore, the power amplifier has a stable gain.

Disclosed is an operation amplification circuit and an over-current protection method therefor. The operation amplification circuit comprises: a control unit, configured to generate an output control signal according to an input signal and an output signal; an output unit, configured to generate an output current under control of the output control signal, wherein the output unit comprises an output capacitor which is charged or discharged by the output current to generate the output signal; an over-current protection unit, obtaining a temperature control current according to an operating temperature of the operation amplification circuit, wherein when the operating temperature is greater than or equal to a predetermined temperature, the temperature control current is positively correlated with the operating temperature, and the over-current protection unit adjusts the output control signal according to the temperature control current to limit the output current.

Embodiments of a method and a device are disclosed. In an embodiment, a method for operating a bias controller for an amplifier circuit involves obtaining temperature data corresponding to a temperature of the amplifier circuit, generating a proportional to absolute temperature (PTAT) bias voltage based on a first PTAT slope when the temperature is within a first range of temperatures or a second PTAT slope when the temperature is within a second range of temperatures, wherein the second PTAT slope is greater than the first PTAT slope, and biasing the amplifier circuit based on the generated PTAT bias voltage.

A device having device function circuitry configured to receive a device signal and output a modified device signal is disclosed. The device includes a device temperature sensor configured to generate a device temperature signal that is proportional to a temperature of the device function circuitry. The device function circuitry is further configured to maintain power dissipation of the device function circuitry to below a predetermined safe power dissipation level in response to a control signal that is generated based upon the device temperature signal.

An integrated cinema amplifier comprises a power supply stage that distributes power over a plurality of channels for rendering immersive audio content in a surround sound listening environment. The amplifier automatically detects maximum and net power availability and requirements based on audio content by decoding audio metadata and dynamically adjusts gains to each channel or sets of channels based on content and operational/environmental conditions. A power supply stage provides power to drive a plurality of channels corresponding to speaker feeds to a plurality of speakers. The amplifier has a front panel having an LED array with each LED associated with a respective channel or group of channels of the multi-channel amplifier, and a control unit configured to light the LEDs according to display patterns based on operating status or error conditions of the amplifier.

A second member is joined in surface contact with a first surface of a first member including a semiconductor region made from an elemental semiconductor. The second member includes a radio-frequency amplifier circuit made from a compound semiconductor. A conductive protrusion projects from the second member toward a side opposite to the first member. The first member includes a temperature measurement element that detects a temperature.