| 摘要 |
PURPOSE: To prevent a malfunction by switching the control of a DC offset. CONSTITUTION: Two kinds of signals which are capable of detecting the location deviation of the input signals of A/D) conversion circuits 105 and 115 are obtained from data buses 110 and 120 and are outputted to switch circuits 106 and 116. The circuits 106 and 116 select the one signal of the two kinds of signals by the switch signal from a terminal 112, output the signal to LPF 107 and 117, smooth the signal, extract control signals and output the signals to amplifier circuits 109 and 119. With the comparison voltage inputted in terminals 108 and 118 as a center, the control signals are amplified and outputted to arithmetic circuits 104 and 114. An I axis side is the circuit connected with a bus 110 and a Q axis side is the circuit connected with a bus 120, and the input signals of the circuits 105 and 115 are made optimum locations. I2 and Q2 are connected on the A side of the switch circuits 106 and 116, I-1 and Q-1 are connected on the B side, and the A side and the B side are selected and switched when I and Q axes side DC offsets are large and when the offsets are small, respectively. |
