Abstract: A temperature sensor circuit for sensing the temperature of an electronic component is disclosed. The temperature sensor circuit comprises a first transistor configured to be thermally isolated from the electronic component and being configured to sense an ambient temperature and a second transistor configured to be thermally linked to the electronic component and being configured to sense a temperature at the electronic component. The temperature sensor circuit is a differential circuit having a first path and a second path with the first and second transistors being arranged on the first and second paths of the differential circuit, respectively, such that the temperature sensor circuit generates an output voltage inversely proportional to a temperature difference between the ambient temperature and the temperature at the electronic component. The temperature sensor circuit also comprises a shut-off switch configured to activate or deactivate the temperature sensor circuit.

Abstract: A variable attenuator circuit is disclosed. The variable attenuator circuit comprises a plurality of varactor diodes configured to attenuate an RF signal between an RF input and an RF output; a reference voltage input, and a control voltage input configured to vary the attenuation of the variable attenuator circuit based upon a control voltage. A radio frequency module and wireless device comprising said variable attenuator are also provided.

Abstract: A temperature controlled attenuator circuit is disclosed. The temperature controlled attenuator circuit comprises a temperature sensor circuit for sensing the temperature of an electronic component and generating a control voltage inversely proportional to a difference in temperature between an ambient temperature and the temperature of the electronic component and a variable attenuator circuit configured to vary its attenuation based upon the control voltage to provide an attenuation based upon the difference in temperature between the ambient temperature and the temperature of the electronic component. A radio frequency module and wireless device comprising said temperature controlled attenuator circuit are also provided.

Abstract: According to at least one example, an amplifier circuit includes an amplifier and a temperature sensor circuit. The temperature sensor circuit includes a first transistor thermally isolated from the amplifier and being configured to sense an ambient temperature, and a second transistor thermally linked to the amplifier and being configured to sense a temperature at the amplifier, the temperature sensor circuit being a differential circuit having a first path and a second path with the first and second transistors being arranged on the first and second paths of the differential circuit respectively. The temperature sensor circuit is configured to generate an output voltage inversely proportional to a temperature difference between the ambient temperature and the temperature at the amplifier.

Abstract: According to one aspect, embodiments of the invention provide a distortion detection circuit comprising an input configured to be coupled to an output stage of an amplifier and to receive an RF signal from the output stage of the amplifier, an output configured to be coupled to a module of the amplifier, at least one peak detection circuit coupled to the input and configured to monitor the RF signal and output a first signal based on positive voltage peaks of the RF signal, and a differential amplifier having an input coupled to the at least one peak detection circuit and configured to monitor the first signal and provide a second signal to the output in response to a voltage of the first signal exceeding a threshold level indicative of distortion in the RF signal.

Abstract: A radio-frequency (RF) module includes a first transistor having a base, a collector, and an emitter, a radio-frequency output transmit path coupled to the collector of the first transistor at a first end and to a radio-frequency output port at a second end, and an output matching network disposed in the radio-frequency output transmit path, the output matching network including a shunt arm coupled to ground, the shunt arm including a switch that is controllable to modify an impedance of the output matching network.

Abstract: A temperature compensation circuit comprises a temperature coefficient circuit that generates a temperature coefficient that is temperature dependent and a compensation circuit that generates a compensation signal based on an indication of temperature of an amplifier and the temperature coefficient, and based on the compensation signal, a gain of the amplifier is adjusted to improve amplifier linearity during data bursts.

Abstract: According to one aspect, embodiments of the invention provide a distortion detection circuit comprising an input configured to be coupled to an output stage of an amplifier and to receive an RF signal from the output stage of the amplifier, an output configured to be coupled to a module of the amplifier, at least one peak detection circuit coupled to the input and configured to monitor the RF signal and output a first signal based on positive voltage peaks of the RF signal, and a differential amplifier having an input coupled to the at least one peak detection circuit and configured to monitor the first signal and provide a second signal to the output in response to a voltage of the first signal exceeding a threshold level indicative of distortion in the RF signal.

Abstract: A temperature compensation circuit comprises a temperature coefficient circuit that generates a temperature coefficient that is temperature dependent and a compensation circuit that generates a compensation signal based on an indication of temperature of an amplifier and the temperature coefficient, and based on the compensation signal, a gain of the amplifier is adjusted to improve amplifier linearity during data bursts.

Abstract: A bias circuit provides additional bias current for power amplifiers during data bursts to compensate for the gain droop caused by a rise in the power amplifier temperature during the data burst. A bias circuit includes a difference amplifier and switches coupled to the difference amplifier. The switches operate the bias circuit in a first mode when a transmit data burst is detected and operate the bias circuit in a second mode after the bias circuit has operated in the first mode for a predetermined period of time. In the first mode, the bias circuit charges a storage capacitor and sets an output current to zero. In the second mode, the bias circuit outputs the output current that increases above the initial value of zero as the PA warms up, where the excursion of this increase of current is determined by a register. The switches disable the bias circuit when the transmit data burst ends.

Abstract: A bias circuit provides additional bias current for power amplifiers during data bursts to compensate for the gain droop caused by a rise in the power amplifier temperature during the data burst. A bias circuit includes a difference amplifier and switches coupled to the difference amplifier. The switches operate the bias circuit in a first mode when a transmit data burst is detected and operate the bias circuit in a second mode after the bias circuit has operated in the first mode for a predetermined period of time. In the first mode, the bias circuit charges a storage capacitor and sets an output current to zero. In the second mode, the bias circuit outputs the output current that increases above the initial value of zero as the PA warms up, where the excursion of this increase of current is determined by a register. The switches disable the bias circuit when the transmit data burst ends.

Abstract: A temperature compensation circuit comprises a temperature coefficient circuit that generates a temperature coefficient that is temperature dependent and a compensation circuit that generates a compensation signal based on an indication of temperature of an amplifier and the temperature coefficient, and based on the compensation signal, a gain of the amplifier is adjusted to improve amplifier linearity during data bursts.

Abstract: A temperature compensation circuit comprises a temperature coefficient circuit that generates a temperature coefficient that is temperature dependent and a compensation circuit that generates a compensation signal based on an indication of temperature of an amplifier and the temperature coefficient, and based on the compensation signal, a gain of the amplifier is adjusted to improve amplifier linearity during data bursts.

Abstract: A bias circuit provides additional bias current for power amplifiers during data bursts to compensate for the gain droop caused by a rise in the power amplifier temperature during the data burst. A bias circuit includes a difference amplifier and switches coupled to the difference amplifier. The switches operate the bias circuit in a first mode when a transmit data burst is detected and operate the bias circuit in a second mode after the bias circuit has operated in the first mode for a predetermined period of time. In the first mode, the bias circuit charges a storage capacitor and sets an output current to zero. In the second mode, the bias circuit outputs the output current that increases above the initial value of zero as the PA warms up, where the excursion of this increase of current is determined by a register. The switches disable the bias circuit when the transmit data burst ends.

Abstract: A bias circuit provides additional bias current for power amplifiers during data bursts to compensate for the gain droop caused by a rise in the power amplifier temperature during the data burst. A bias circuit includes a difference amplifier and switches coupled to the difference amplifier. The switches operate the bias circuit in a first mode when a transmit data burst is detected and operate the bias circuit in a second mode after the bias circuit has operated in the first mode for a predetermined period of time. In the first mode, the bias circuit charges a storage capacitor and sets an output current to zero. In the second mode, the bias circuit outputs the output current that increases above the initial value of zero as the PA warms up, where the excursion of this increase of current is determined by a register. The switches disable the bias circuit when the transmit data burst ends.

Abstract: A temperature compensation circuit comprises a temperature coefficient circuit that generates a temperature coefficient that is temperature dependent and a compensation circuit that generates a compensation signal based on an indication of temperature of an amplifier and the temperature coefficient, and based on the compensation signal, a gain of the amplifier is adjusted to improve amplifier linearity during data bursts.

Abstract: A bias circuit provides additional bias current for power amplifiers during data bursts to compensate for the gain droop caused by a rise in the power amplifier temperature during the data burst. A bias circuit includes a difference amplifier and switches coupled to the difference amplifier. The switches operate the bias circuit in a first mode when a transmit data burst is detected and operate the bias circuit in a second mode after the bias circuit has operated in the first mode for a predetermined period of time. In the first mode, the bias circuit charges a storage capacitor and sets an output current to zero. In the second mode, the bias circuit outputs the output current that increases above the initial value of zero as the PA warms up, where the excursion of this increase of current is determined by a register. The switches disable the bias circuit when the transmit data burst ends.

Abstract: A radio-frequency (RF) module includes a first transistor having a base, a collector, and an emitter, a radio-frequency output transmit path coupled to the collector of the first transistor at a first end and to a radio-frequency output port at a second end, and an output matching network disposed in the radio-frequency output transmit path, the output matching network including a shunt arm coupled to ground, the shunt arm including a switch that is controllable to modify an impedance of the output matching network.

Abstract: A circuit and method are provided for detecting a power of a signal amplified in a power amplifier. A diode and a voltage bias source are used to shift a voltage of the signal taken at a base of an amplifying transistor of the power amplifier, to generate a positive signal. The positive signal is provided to a base input of an emitter follower exhibiting high input impedance to generate a power detector output which follows the positive signal.

Abstract: A dual band amplifier is provided comprising a first matching circuit disposed in a first radiofrequency path between an input port and a first amplifier and a second matching circuit disposed in a second radiofrequency path between the input port and a second amplifier. The first matching circuit transforms a first input impedance of the first amplifier to a predetermined input port impedance when the radiofrequency signal is in a first frequency range and transmits the first input impedance to the input port when the radiofrequency signal is in the second frequency range. The second matching circuit transforms the second input impedance to the input port impedance when the input signal is in the second frequency range and transmits the second input impedance to the input port when the radiofrequency signal is in the first frequency range.