| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for effectively suppressing an in-phase component of a differential signal. SOLUTION: A differential signal SIN is supplied to an input terminal 321 and an input terminal 322 of a signal processing circuit 30. A differential amplifier 42 includes a non-inverted input terminal PIN1, an inverted input terminal PIN2, an inverted output terminal POUT1, and a non-inverted output terminal POUT2. Resistors R1 to R4 are connected to the differential amplifier 42. A control circuit 46 controls a resistance value of at least one of the resistors R1 to R4, in response to a potential of at least one of the inverted output terminal POUT1 and the non-inverted output terminal POUT2, in such a way that a resistance ratio R2/R1 of the resistors R1 and R2 comes closer to a resistance ratio R4/R3 of the resistors R3 and R4. An in-phase setting section 44 sets the input terminal 321 and the input terminal 322 to the equal potential when operating the control circuit 46. COPYRIGHT: (C)2011,JPO&INPIT
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