摘要:
A wireless communication apparatus includes a power-supply apparatus configured to supply electric power to a load that is intermittently operated by using a battery as a power supply; and a control unit configured to control the power-supply apparatus, wherein the power-supply apparatus includes a capacitor; a switching unit capable of selectively forming a first path through which charging is performed from the battery to the capacitor and a second path through which the battery is connected in series with the capacitor, and wherein the control unit controls the switching unit so that the first path is formed during a period in which the load is idle and the second path is formed during a period in which the load is not idle, and thereby supplies the voltage of the sum of the battery voltage and the charged voltage of the capacitor in a non-idle period.
摘要:
A power amplifying apparatus includes an input terminal configured to receive an input signal, a first power amplifier biased for class A or class AB operation which is configured to amplify the input signal, an output terminal connected to an output of the first power amplifier, a second power amplifier biased for class C operation which is configured to receive and amplify a part of the input signal, and a switch connected between an output of the second power amplifier and the output terminal.
摘要:
Disclosed is a distortion compensating and power amplifying apparatus including: a transistor to power amplifies an input signal; a branch circuit to branch the input signal into two signals; distortion compensation means for generating a second harmonic of a fundamental wave for one of branched signals and adding the generated second harmonic to the other branch signal from said branch circuit for input to an input terminal of said transistor; and a termination circuit connected to an output terminal of said transistor and grounding the second harmonic.
摘要:
An apparatus and method for distortion compensation of a high frequency power amplification section wherein a finite difference between envelopes of input and output signals of an amplifier of an object of distortion compensation is detected, and variation of a temperature and other parameters is suppressed using a component which originates from an offset of the finite difference. Further, a component of the finite difference which originates from the distortion is added to the input signal of the amplifier to effect distortion compensation.
摘要:
A semiconductor amplifying apparatus and a communication terminal apparatus to satisfy a standard value for adjacent channel power and amplify the power at a high efficiency. The value of an impedance viewed from an input terminal side of an impedance circuit network connected to an input terminal of a transistor is set at a value which causes a characteristic curve for a mutual modulation distortion component included in output power of the transistor to form, in the middle thereof, a curve section in which an inclination angle of a tangential line to this characteristic curve once becomes smaller, or a curve section which protrudes downwardly.
摘要:
A power amplifier is provided which operates in a quasi-microwave band between 0.8 GHz and 2 GHz with a high output, a small size and low power consumption. Junction type GaAs FETs are connected in a multi-stage manner to form an amplification circuit. An impedance matching/phase adjusting circuit is provided between the respective stages. An input impedance matching circuit, an output impedance matching circuit and bypass capacitors for a power source terminal are provided. Further, a gain control terminal and gate bias terminals for setting operating points of the JFETs are provided, thereby forming an entire arrangement as a semiconductor integrated circuit.
摘要:
A power amplification apparatus that performs an inverse fast Fourier transformation on data allocated to a plurality of sub-carriers, converts time-domain data output in parallel from the inverse fast Fourier transformation into a time-domain analog signal, performs a power amplification on the time-domain analog signal, wherein a saturation output level of the power amplification is adjustable in accordance with a switching signal. The power amplification apparatus also compares an amplitude of a signal in each time slot of the time-domain analog signal with a predetermined threshold and switches the saturation output level of the power amplification based on an output of the comparing.
摘要:
A power amplifying apparatus includes an input terminal configured to receive an input signal, a first power amplifier biased for class A or class AB operation which is configured to amplify the input signal, an output terminal connected to an output of the first power amplifier, a second power amplifier biased for class C operation which is configured to receive and amplify a part of the input signal, and a switch connected between an output of the second power amplifier and the output terminal.
摘要:
Disclosed is a digital signal processing portion that amplifies a high frequency signal resulting from digitally modulating data to be transmitted. An envelope detection portion (DETenv) generates the high frequency signal's envelope voltage. A comparator compares this envelope voltage with reference voltage Vref to generate two-state output. According to this two-state output, a power converter circuit converts power supply voltage Vbatt into power and outputs power supply voltage Vpa for a power amplifier. While the envelope voltage is larger than the reference voltage Vref, for example, the power supply voltage Vpa is changed from voltage V1 to V2 (larger than V1). In this manner, there are provided a high frequency power amplifier and a transmitter capable of decreasing distortion of transmission signals by means of a relatively simple technique.
摘要:
One divided signal divided into two by a dividing circuit is inputted to a gate of a source grounded FET through a first matching circuit. In a drain of the FET, a second harmonic having a phase and an amplitude in accordance with an impedance of the first matching circuit is generated and extracted in a band pass filter and then the amplitude is adjusted in an attenuation circuit to input to an addition circuit through a second matching circuit. In the addition circuit, the output of the second matching circuit is added to another divided signal of the dividing circuit and inputted to a power amplifier. The impedance in the first matching circuit affecting the phase of the second harmonic generated from the FET is set so that a distortion component generated in the power amplifier is compensated for by the second harmonic inputted in the addition circuit.