Transmission/reception circuit, communication apparatus, and method of controlling transmission/reception circuit

A communication apparatus comprising:

• a transmission circuit that modulates a transmission information signal and supplies the transmission information signal, as a transmission signal, to an antenna;
• the antenna that transmits the transmission signal and receives a reception signal;
• a loop-back test signal generation circuit that modulates a predetermined signal to be modulated and supplies the predetermined signal to be modulated as a loop-back test signal;
• a selection unit that selects one of the reception signal from the antenna or the loop-back test signal, and supplies the selected signal as a signal to be demodulated;
• a reception circuit that demodulates the signal to be demodulated and acquires a reception information signal;
• and
• a test circuit that compares the reception information signal and the predetermined signal to be modulated.

A method of controlling a transmission/reception circuit, comprising:

• a transmission step of modulating a transmission information signal and supplying the transmission information signal, as a transmission signal, to an antenna;
• a loop-back test signal generation step of modulating a predetermined signal to be modulated and supplying the predetermined signal to be modulated as a loop-back test signal;
• a selection step of selecting one of a reception signal from the antenna or the loop-back test signal, and supplying the selected signal as a signal to be demodulated;
• a reception step of demodulating the signal to be demodulated and acquiring a reception information signal;
• and
• a test step of comparing the reception information signal and the predetermined signal to be modulated.