摘要:
PROBLEM TO BE SOLVED: To maintain successful ACP characteristics even when the number of carriers changes with time. SOLUTION: Radio communication equipment transmits a transmission signal in a predetermined frequency band, and includes: a power amplifier for amplifying a multicarrier transmission signal; a storage part which preliminarily stores bias setting data showing correspondence relation between a transmission output setting value of the transmission signal set based on adjacent channel leakage power characteristics and a bias voltage setting value of the power amplifier, and carrier number correction data showing correspondence relation between the number of subcarriers for transmitting the transmission signal and a carrier number correction value of the transmission output setting value; and a control part which obtains a carrier number correction value corresponding to the number of subcarriers which attempt to transmit the transmission signal from the carrier number correction data, corrects the transmission output setting value using the obtained carrier number correction value, and determines the bias voltage setting value corresponding to the transmission output setting value after correction by the carrier number correction value based on the bias setting data. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a wireless communication device and a transmission control method which allow an optimum ACP to be always maintained in transmitting each transmission output. SOLUTION: A transmission output acquiring section 13 acquires the transmission output when modulating signals amplified by a power amplifier are transmitted. A storage section 15 stores a bias setting table which associates bias voltage of the power amplifier set up based on an ACP property with the transmission output. A control section 14 controls to set up the bias voltage corresponding to the acquired transmission output using the bias setting table stored in the storage section 15, when a transmission output value is acquired by the transmission output acquiring section 13. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a communication apparatus, wherein oscillation of a power amplifier that is a new problem caused by provision of a conductor for suppressing the effects of noise on a chip antenna. SOLUTION: The communication apparatus, wherein the chip antenna 2 for acquiring a radio wave with a desired frequency, an RF circuit 3 for down-converting the frequency of the received signal from the chip antenna 2, and a digital circuit 4 for applying demodulation processing to the down-converted received signal received from the RF circuit 3 are mounted on a printed wiring board 1, includes a conductor 5, extended between the chip antenna 2 and the digital circuit 4 to a position of a prescribed height from the printed wiring board 1, and one end of which is connected to a ground conductor of the printed wiring board 1; and a radio wave absorbing body 13 attached to the conductor 5. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To flatten a frequency-gain characteristic in a used band of an output signal in a band limiting circuit including an operational amplifier and a band pass filter. SOLUTION: The band limiting circuit 1 includes the operational amplifier 2 for amplifying a signal, and the band pass filter 4 for limiting passing of a frequency component other than the used band of the frequency component of the signal. The circuit 1 changes a gain increase/decrease rate for the frequency of the used band in the operational amplifier 2 in response to a signal to be output from the circuit 1. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To suppress degradation of signal quality while significantly suppressing vicinity spurious.SOLUTION: Radio equipment 100 can connect a spurious attenuation filter 140. The spurious attenuation filter 140 removes vicinity spurious included in a transmission signal. The radio equipment 100 includes a storage section 114, a temperature detection section 130, and a correction processing section 112. The storage section 114 stores a filter characteristic correspondingly to temperatures. The filter characteristic relates to a phase delay corresponding to a frequency of the spurious attenuation filter 140. A correction processing section 112 corrects a transmission signal on the basis of the filter characteristic stored in the storage section 114.
摘要:
PROBLEM TO BE SOLVED: To provide radio communication equipment capable of maintaining successful ACP (adjacent channel leakage power) characteristics without depending on a transmission frequency and suppressing the deterioration of signal quality. SOLUTION: The radio communication equipment transmits a transmission signal in a predetermined frequency band, and is provided with: a power amplifier which amplifies the transmission signal; a storage part which preliminarily stores bias setting data showing a correspondence relation between a transmission output setting value and a bias voltage setting value set based on adjacent channel leakage power characteristics and frequency correction data showing a correspondence relation between a transmission frequency setting value and a frequency correction value of the transmission output setting value; and a control part which acquires the frequency correction value corresponding to the present transmission frequency setting value from the frequency correction data, corrects the present transmission output setting value using the acquired frequency correction value, and determines a bias voltage setting value corresponding to the transmission output setting value after correction based on the bias setting data. COPYRIGHT: (C)2011,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an AGC (Automatic Gain Control) circuit performing stable temperature control by reducing errors, caused by the temperature correction for gain characteristics of AGC amplifiers. SOLUTION: The AGC circuit 11 includes a plurality of AGC amplifiers 12, 13 arrayed in series and controls in parallel gains of the plurality of AGC amplifiers 12, 13 in accordance with a common AGC voltage. The AGC circuit 11 further includes a linearity correction circuit 14 for correcting the AGC voltage in such a way that output characteristics from the plurality of AGC amplifiers 12, 13 become linear with respect to the AGC voltage. COPYRIGHT: (C)2010,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide electronic apparatus equipment which inhibits the radiation of an unnecessary electromagnetic wave in a projection member and noise generation by an unnecessary electromagnetic wave from the outside by suppressing a signal current leaked from an electronic part by a simple structure. SOLUTION: The electronic apparatus equipment configured by mounting the electronic part 1 in a conductive housing 10 has a conductive projection member 11 which projects and is formed on the external surface of the housing 10; and a conductive counter member 12 which is electrically connected at one end with the projection member 11 and arranged opposite to the other end to the projection member 11 in a state of a movable end, and can generate an electric field between the projection member 11 in cooperating with the projection member 11. The counter member 12 constitutes so that electric field strength in the movable end of the other end may be maximum when the electric field is formed between it and the projection member 11. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide an electronic apparatus which improves the shielding against noise caused by electromagnetic waves.SOLUTION: An electronic apparatus includes: a circuit board 10 on which electronic components 11, 12 are mounted; and a shield case 20 attached to the circuit board 10. The shield case 20 includes: a frame member 210 which is attached to the circuit board 10 so as to enclose the electronic components 11, 12; and a lid member 220 that is attached to the frame member 210 so as to cover the side opposite to the circuit board 10. The frame member 210 includes: an outer wall part 211 enclosing the electronic components 11, 12; and a bridge part 212 partitioning an internal region of the outer wall part 211. In the lid member 220, an opening 221 is formed at a region corresponding to the bridge part 212.