The invention relates to a method for adapting the applied volume gain in an amplifier controlling at least one loudspeaker of an enclosure according to the desired volume gain selected by a user on a scale increased by a maximum desired volume gain, including the following steps: determining (204) the effective intensity applied to at least one loudspeaker, calculating (206, 208) a maximum volume gain from: the desired volume gain, the effective intensity applied to the loudspeaker, thermal characteristics of the loudspeaker, the maximum desired volume gain, calculating (210) an increasing monotonic function providing an variable applied volume gain according to the desired volume gain such that the image of the maximum desired volume gain by the monotonic function is equal to the maximum volume gain, applying (212), to the amplifier, as applied volume gain, the minimum of the maximum volume gain and the variable applied volume gain for the desired volume gain.

The invention relates to a method for adapting the applied volume gain in an amplifier controlling at least one loudspeaker of an enclosure according to the desired volume gain selected by a user on a scale increased by a maximum desired volume gain, including the following steps: determining (204) the effective intensity applied to at least one loudspeaker, calculating (206, 208) a maximum volume gain from: the desired volume gain, the effective intensity applied to the loudspeaker, thermal characteristics of the loudspeaker, the maximum desired volume gain, calculating (210) an increasing monotonic function providing an variable applied volume gain according to the desired volume gain such that the image of the maximum desired volume gain by the monotonic function is equal to the maximum volume gain, applying (212), to the amplifier, as applied volume gain, the minimum of the maximum volume gain and the variable applied volume gain for the desired volume gain.

Radio frequency amplifiers with overload protection are provided herein. In certain configurations, an RF amplifier system includes an RF amplifier that receives an RF signal from an input terminal and that generates an amplified RF signal at an output terminal, and an overload detection circuit that generates a detection signal indicating a detected signal level of the RF amplifier. The RF amplifier includes an amplification device that amplifies the RF signal and a degeneration circuit that provides degeneration to the amplification device. Additionally, the detection signal is operable to control an amount of degeneration provided by the degeneration circuit so as to protect the RF amplifier from overload.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

A method is provided for adapting an applied volume gain in an audio amplifier controlling at least one loudspeaker of an enclosure according to a desired volume gain selected by a user on a scale increased by a maximum desired volume gain, including determining effective intensity applied to the loudspeaker, calculating maximum volume gain from the desired volume gain, an effective intensity applied to the at least one loudspeaker, thermal characteristics of the loudspeaker, and the maximum desired volume gain, then calculating a variable applied volume gain according to an increasing monotonic function providing a variable applied volume gain according to the desired volume gain such that the image of the maximum desired volume gain by the monotonic function is equal to the maximum volume gain, and applying to the amplifier as applied volume gain, the minimum of the desired volume gain and the variable applied volume gain.

A method is provided for adapting an applied volume gain in an audio amplifier controlling at least one loudspeaker of an enclosure according to a desired volume gain selected by a user on a scale increased by a maximum desired volume gain, including determining effective intensity applied to the loudspeaker, calculating maximum volume gain from the desired volume gain, an effective intensity applied to the at least one loudspeaker, thermal characteristics of the loudspeaker, and the maximum desired volume gain, then calculating a variable applied volume gain according to an increasing monotonic function providing a variable applied volume gain according to the desired volume gain such that the image of the maximum desired volume gain by the monotonic function is equal to the maximum volume gain, and applying to the amplifier as applied volume gain, the minimum of the desired volume gain and the variable applied volume gain.

A device for processing an input signal, including a local oscillator, designed to generate an oscillator signal; a subtracting unit, designed to subtract an amplified correction signal from the input signal in order to generate a corrected input signal; a downmixer, designed to mix the corrected input signal downward to an intermediate frequency using the oscillator signal in order to generate a difference signal; a first amplifier unit, designed to amplify the difference signal in order to generate and output an output signal; a correcting unit, designed to suppress a predefined frequency range of the output signal in order to generate a correction-difference signal; an upmixer, designed to mix the correction-difference signal upward using the oscillator signal in order to generate a correction signal; and a second amplifier unit, designed to amplify the correction signal in order to generate the amplified correction signal.

An amplifier circuit includes an input terminal used to receive an input signal, an output terminal used to output an output signal, an amplification unit, and a phase adjustment unit. The amplification unit includes an input terminal coupled to the input terminal of the amplifier circuit, an output terminal coupled to the output terminal of the amplifier circuit, a first terminal coupled to a first voltage terminal, and a second terminal coupled to a second voltage terminal. The phase adjustment unit is coupled to the amplification unit. When the amplifier circuit is operated in a first mode, the output signal has a first phase, and when the amplifier circuit is operated in a second mode, the output signal has a second phase. A difference between the first phase and the second phase is within a predetermined range.

A radio frequency (RF) power amplifier circuit includes an input and an output. A power amplifier transistor has a first terminal connected to the input, a second terminal connected to the output, and a third terminal defined by a degeneration inductance. A first capacitor is connected to the third terminal of the power amplifier transistor, along with a negative capacitance circuit connected in series with the first capacitor. The negative capacitance and the first capacitor define a series resonance at a predefined operating frequency band, which shunts the degeneration inductance of the third terminal.