| 摘要 |
PROBLEM TO BE SOLVED: To provide a circuit and a method for stabilizing D/S converter, with which the saturation of output characteristics from power amplifiers on the final stage of a D/S converter can be suppressed. SOLUTION: Concerning the stabilizing circuit for D/S converter, with which a reference voltage (Vref) supplied to a transformer (1) is converted and inputted to a quadrant circuit (3) and the output of the quadrant circuit (3) is supplied through a SIN multiplier (4A) and a COS multiplier (4B) to power amplifiers (5A and 5B) on the final stage, this circuit is provided with an AGC circuit (10), which is installed between the transformer (1) and the quadrant circuit (3), for converting the voltage supplied from the transformer (1) to a constant voltage value (V) and supplying it to the quadrant circuit (3) so that sine wave outputs (V0) from the power amplifiers (5A and 5B) on the final stages can not be saturated.
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