| 摘要 |
PURPOSE:To accurately control an output of an amplifier to a prescribe level by applying temperature compensation calculation to an amplifier output data processed by a digital signal based on a temperature data and applying analog processing to the calculated current control data so as to generate a current control signal based on side analog signal. CONSTITUTION:A signal inputted to an amplifier 1 is amplified to a prescribed output by a preset gain. A detector 2 detects the signal and outputs a voltage signal 2a to an A/D converter 3. The converter 3 outputs an output data 3a being the result of A/D conversion of the signal 2a to a control section 4. The control section 4 executes a prescribed temperature compensation arithmetic calculation based on temperature information 5a from the temperature detector 5 to calculate the current control data 4a and to give an output to a D/A converter 6. The converter 6 output a current control signal 6a processed as an analog signal to a power supply current control circuit 7. Then the circuit 7 controls the power current impressed to the amplifier 1 based on the signal 6a.
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