| 摘要 |
<p>PURPOSE:To make it possible to constitute a compact transceiver module housing an automatic phase controlling circuit at a low cost by receiving the input signal of a preamplifier and the monitoring signal obtained by amplifying the input signal with two mixers by changing over switches, and detecting the transmitting signal. CONSTITUTION:The input and output signals of a transmitting system and a receiving system are inputted into two mixers 3 with the phase being shifted by 90 degrees by changing three switches 4-6. Detected digital signals 3a and 3b are converted into the digital signals with A/D converters 11 and 12. In a ROM 113, tan-1 ¦3b/3a¦ is operated based on the digital signals, and the phase correcting data are outputted. A switching signal 21 of transmitting/receiving phase monitor is inputted to the highest bit of the input address of the ROM 113. Thus, the phase operating expressions of the transmitting system and the receiving system are switched.</p> |
