| 摘要 |
PROBLEM TO BE SOLVED: To provide an OTA circuit which has high linearity with its circuit scale reduced and achieves high output current efficiency. SOLUTION: The OTA circuit comprises a first pair of transistors (M1, M2) to which a differential input signal is applied, a second pair of transistors (M3, M4) to which a common-mode voltage of the differential input signal is applied and which are parallel-connected to an output of the first pair of the transistors (M1, M2) and further whose sources are connected to each other, a third pair of transistors (M5, M6) to which the differential input signal is applied and which are cascade-connected to the second pair of the transistors (M3, M4), and a fourth pair of transistors (M5, M6) to which the differential input signal is applied and which are cascade-connected to the third pair of the transistors (M5, M8) so that input signals input to gates of the pair transistors (M7, M8) are allowed to be mutually reverse in phase. Then, common sources of the first and fourth pairs of transistors (M1, M2, M7, M8) are driven by a constant-current power supply I<SB>0</SB>. COPYRIGHT: (C)2008,JPO&INPIT
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