| 摘要 |
PURPOSE: A base station transmitter circuit of a wireless communication network is provided to sense whether a transmission path is normal by using the single transmitter circuit, thereby measuring a standing-wave ratio of a transmission antenna, sensing a transmission output, and automatically controlling an output of a transmitter. CONSTITUTION: A frequency converter(12) converts a frequency of an inputted baseband signal. A band filter 1(22) filters a transmission band of the signal. Amplifiers 1 and 2(32,52) amplify the signal. A variable attenuator(42) variably attenuates signal strength. A local oscillator(102) oscillates a certain frequency, and applies the oscillated frequency to the frequency converter(12). A controller(112) controls an output. A multi-point switch(122), a band filter 2(132), and an RSSI(142) are comprised. An amplifier 3(72), a band filter 3(82), and a directional coupler(10) are comprised on a path connected to a transmission antenna(80) from outside of a transmitter circuit.
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