| 摘要 |
PURPOSE:To compensate the voltage fluctuation of a multiplier caused by a temperature variation by inserting an inverting circuit for negating a temperature fluctuation into one input terminal of the multiplier for multiplying an imaginary number component. CONSTITUTION:An inverter 111 is inserted into an input side of a multiplier 108 for inputting and multiplying a real number component R1 of a first input signal S1 and an imaginary number component of a second input signal S2, and a subtracter 110 is provided as an arithmetic means for sending out a result of operation of outputs of a multiplier 107 and 108 to an output terminal 113 for outputting an output signal I of an imaginary number component. An output of a multiplier 105, and an output of a multiplier 106 are R1.R2+ V (in this regard, V denotes a temperature drift voltage on an output side of the multiplier), and I1.I2+ V, respectively. Accordingly, by an output of a subtracter 109, the voltage V is cancelled. On the other hand, an output of the multiplier 107, and an output of the multiplier 108 are I1.R2+ V, and the inverse of R1.I2+ V, respectively. Accordingly, by an output of the subtract er 110, the voltage V is cancelled. |
