| 摘要 |
PROBLEM TO BE SOLVED: To provide a feedforward amplifier that can surely and quickly lead a characteristic value to an optimum point, regardless of the input variation. SOLUTION: The feedforward amplifier is composed by adding a detection circuit 33 that detects the input signal of a signal line 2 for outputting a DC component, a subtraction circuit 26 that carries out subtraction of the output and the output signal and an addition circuit 19, an A/D converter 27 for converting an analog signal into a digital signal, a table 29 that stores a nominal control value in advance, a D/A converter 30 for converting the digital signal from a CPU 28 to the analog one, and an A/D converter 34 for converting the DC voltage of the detection circuit 33 into a digital value to a transmitter due to conventional feedforward control. COPYRIGHT: (C)2003,JPO
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