| 摘要 |
To provide a transmitter wherein even in a case of sharing a detector circuit between or among a plurality of transmitting circuits, a high degree of detection accuracy can be achieved without increasing the signal power supplied to the detector circuit. In a transmitter including a detector circuit shared by transmitting circuits and that deal with signals of different frequency bands, a capacitor C1, which constitutes an RF coupler disposed on an output signal line of the transmitting circuit, is directly connected to the input terminal of the detector circuit, while series coils L1 and L2 are inserted between a capacitor C2, which makes up an RF coupler disposed on an output signal line of the transmitting circuit which deals with signals of a lower frequency band than the transmitting circuit, and the input terminal of the detector circuit. |
| 主权项 |
1. A transmitter comprising:
a first transmitting circuit which corresponds to a signal of a first frequency band;a second transmitting circuit which corresponds to a signal of a second frequency band; having a lower frequency band than the first frequency band;
a first coupler which, disposed on an output signal line of the first transmitting circuit, branches and outputs part of an output signal from the first transmitting circuit; a second coupler which, disposed on an output line of the second transmitting circuit, branches and outputs part of an output signal from the second transmitting circuit; and a detector circuit detecting an input signal whose input terminal is coupled to a branched output terminal of the first coupler and a branched output terminal of the second coupler, wherein a first filter circuit which, arranged between the input terminal and the branched output terminal of the first coupler, passes a signal of the first frequency band, and a second filter circuit which, arranged between the input terminal and the branched output terminal of the second coupler, passes a signal of the second frequency band.
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