Abstract: A wireless communication device includes: a transmitting circuit that is connected to an antenna and includes a power amplifier that amplifies an input signal; a receiving circuit that is connected to the antenna and includes a switch that switches as to whether or not a signal is received; and a processor that executes a process including: acquiring timing information that indicates timing of a guard period when no signal is transmitted or received by the antenna; turning on the power amplifier and turning on the switch in the guard period based on the acquired timing information to input a noise signal of the transmitting circuit that is amplified by the power amplifier to the receiving circuit; measuring electrical power of a signal that is output from the receiving circuit in the guard period; and determining abnormality of the receiving circuit based on the measured electrical power.

Abstract: A wireless apparatus including: an amplification circuit configured to generate a second signal by amplifying power of a first signal, a calculation circuit configured to calculate a deviation amount of phase deviation of the second signal from the first signal, and a correction circuit configured to correct the phase deviation using a correction method that is selected from a plurality of correction methods based on the deviation amount, the plurality of correction methods among which each power consumption is higher as each correction amount corresponding to each power consumption is greater.

Abstract: A wireless apparatus including: an amplification circuit configured to generate a second signal by amplifying power of a first signal, a calculation circuit configured to calculate a deviation amount of phase deviation of the second signal from the first signal, and a correction circuit configured to correct the phase deviation using a correction method that is selected from a plurality of correction methods based on the deviation amount, the plurality of correction methods among which each power consumption is higher as each correction amount corresponding to each power consumption is greater.

Abstract: A gain temperature compensation circuit producing a relatively small loss of power, and enabling modification of a variation width of the attenuation amount in a predetermined temperature range is provided. A gain temperature compensation circuit includes a circulator and a thermistor. The circulator outputs a signal being input to a first port to a second port, and outputs the signal being input to the second port to a third port. The thermistor being connected to the second port reflects the signal being output from the second port by varying the power of the signal according to temperature, so as to input to the second port, in order to adjust the attenuation amount of the signal.

Abstract: A gain temperature compensation circuit producing a relatively small loss of power, and enabling modification of a variation width of the attenuation amount in a predetermined temperature range is provided. A gain temperature compensation circuit includes a circulator and a thermistor. The circulator outputs a signal being input to a first port to a second port, and outputs the signal being input to the second port to a third port. The thermistor being connected to the second port reflects the signal being output from the second port by varying the power of the signal according to temperature, so as to input to the second port, in order to adjust the attenuation amount of the signal.

Abstract: To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (30) and its phase and amplitude are adjusted by a vector adjusting circuit (32), and then the thus adjusted reflected wave is vector-summed with the feedback signal in a vector sum circuit (34).

Abstract: To cancel a reflected wave reflected from a connecting portion (22) and leaking into a feedback signal when a non-matched component is connected, the reflected wave is extracted by a circulator (30) and its phase and amplitude are adjusted by a vector adjusting circuit (32), and then the thus adjusted reflected wave is vector-summed with the feedback signal in a vector sum circuit (34).

Abstract: A phase correction amplifier according to the present invention includes; a GaAs field effect transistor; and a Si field effect transistor or a Si bipolar transistor; wherein the GaAs field effect transistor and the Si field effect transistor or the Si bipolar transistor are cascade-connected each other through a variable attenuator.

Abstract: A phase correction amplifier according to the present invention includes; a GaAs field effect transistor; and a Si field effect transistor or a Si bipolar transistor; wherein the GaAs field effect transistor and the Si field effect transistor or the Si bipolar transistor are cascade-connected each other through a variable attenuator.

Abstract: The present invention relates to a feed-forward amplifying device suitable for radio communication systems such as digital automobile telephone.