A distortion compensating apparatus used in a wireless communication device such as a portable phone. An information measuring unit (11a) measures a distortion component and an electric power component based on a radiation signal. A compensation coefficient calculating unit (11b) calculates a compensation coefficient based on the distortion component and the electric power component. A signal transmitting unit (11c) outputs a signal corrected by the compensation coefficient as a transmission signal. A signal converting unit (13) converts the transmission signal into a high frequency signal. An amplitude separating unit (15) amplifies the high frequency signal and separates a portion thereof as a signal to be fed back. A feeding-back unit (14) processes the separated portion and outputs the result as a feedback signal to the information measuring unit (11a). An electric power information extracting unit (16) outputs a portion of the high frequency signal as the radiation signal, extracts electric power information from the radiation signal, and directly outputs the electric power information to the information measuring unit (11a).

The present invention relates to an amplifying apparatus and has one of the objects to control (optimize), in an amplifier having a circuit constant determined so as to satisfy the condition of E-class operation, the circuit constant (e.g., the capacity of a capacitor) in accordance with an output power from the amplifier. For the above, the amplifying apparatus of the present invention includes an amplifier (20) having a circuit constant determined so as to satisfy a condition for E-class operation; power detecting means (17, and 18) which detects an output electricity from the amplifier; and controlling means (19) which controls the circuit constant in accordance with the output power detected by the power detecting means.

An RF amplification device comprises amplification elements Q11 and Q12 which amplify a radio frequency input signal Pin_LB in wireless radio communication, and transmission line transformers TLT11, TLT12, coupled to one of an input electrode and an output electrode of the amplification element. The TLT11, TLT12 comprise a main line Lout arranged between the input and the output, and a sub line Lin1 arranged between an AC ground point and one of the input and the output and coupled to the main line Lout. By applying an operating voltage Vdd different from the ground voltage level GND to the AC ground point, the operating voltage Vdd is supplied to the output electrodes of the amplification elements Q11, Q12 via the sub line Lin from the AC ground point. In realizing a high-performance load circuit in an RF amplification device, it is possible to avoid increase of a module height of an RF module, and at the same time, to avoid increase of an occupied area of a load circuit of a high-frequency amplifier which is formed over a semiconductor chip or a multilayer wiring circuit substrate.

A system and method for dynamic adjustment of drain or collector voltage of a power amplifier (PA), including a PA having a voltage input, a temperature sensor (616) measuring ambient temperature of the PA, and an adaptive PA control processor (608) that dynamically changes the input voltage based on the ambient temperature, achieving a desired peak power when the system is subjected to high temperatures. In a further embodiment, a power sensor (614) measures output power of the PA, and the control processor (608) dynamically changes the voltage based on output power when the system serves a large cell in a mobile communication infrastructure employing high power. In a further embodiment, a multistage PA and method include amplifier stages having drain or collector voltage inputs, wherein a voltage applied to the inputs are set so as to be proportional to the peak power requirements of each stage, enhancing overall efficiency.

Disclosed is an adaptive control apparatus having an error calculation unit for calculating the difference between a reference signal and a feedback signal, and an adaptive controller for applying adaptive control so as to diminish the difference and causing the result of adaptive control to be reflected in the reference signal. The adaptive control apparatus has a delay unit for delaying at least one of the reference signal and feedback signal by a set delay time in such a manner that the reference signal and feedback signal will be input simultaneously to the arithmetic unit; a frequency-component detecting unit for detecting a frequency component of the reference signal; a delay-time acquisition unit for acquiring delay time conforming to the frequency component; and a delay-time setting unit for setting the acquired delay time in the delay unit.

Disclosed is an adaptive control apparatus having an error calculation unit for calculating the difference between a reference signal and a feedback signal, and an adaptive controller for applying adaptive control so as to diminish the difference and causing the result of adaptive control to be reflected in the reference signal. The adaptive control apparatus has a delay unit for delaying at least one of the reference signal and feedback signal by a set delay time in such a manner that the reference signal and feedback signal will be input simultaneously to the arithmetic unit; a frequency-component detecting unit for detecting a frequency component of the reference signal; a delay-time acquisition unit for acquiring delay time conforming to the frequency component; and a delay-time setting unit for setting the acquired delay time in the delay unit.