| 摘要 |
PROBLEM TO BE SOLVED: To provide a phase shifting circuit which is small in the number of elements and inexpensive and can make a phase shift of 0 to -2π. SOLUTION: A current operational amplifier 12 outputs an output current 3I which is three times as large as an input current and an output current -2I which is -2 times. The time constant current constituted by connecting a resistance 21 and a capacitor 22 in series supplies part of the output current 31 to the ground side and a resistance 23 leads the remaining current which does not flow to the time constant current to an output terminal 40. Further, a capacitor 31 supplies part of the output current -2I to the ground side and a resistance 32 leads the remaining current which does not flow to this capacitor 31 to the output terminal 40. The resistance 23 has a resistance value which is twice as large as that of the resistance 21 and the time constant based upon the capacitor 31 and resistance 32 is much smaller than the time constant based upon the resistance 21 and capacitor 22.
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