| 摘要 |
PURPOSE:To offer a phase control circuit for endless phase shifter without deteriorating main signal by providing an integration circuit between a phase control circuit and the endless phase shifter in a diversity receiver. CONSTITUTION:A digital operating circuit OP compares the amplitude of a present synthesized wave detected by a detecting circuit DET with the amplitude of the synthesized wave before one step, and when the result is positive, the direction of phase change of the endless phase shifter EPS is decided in a prescribed direction, an ROM address before one step is extracted so as to shift the address by one step address in the designated direction and to be fed to the ROM. Since the ROM extracts the corresponding control signal from the address information and applies it to a D/A CON-1 and D/A CON-2, X and Y analog control voltages to the endless phase shifter EPS are obtained from the converter. In applying this control voltage to integration circuits In-1, In-2, the voltage is delayed by the time constant's share of the integration circuit in reaching the final value of this control voltage. Since the delayed control signal is applied to the infinite phase shifter EPS, the rate of phase change in the reception wave slows down. |
