| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption in performing common mode feedback operation in a fully-differential amplifier circuit. SOLUTION: The fully-differential amplifier circuit includes: a differential amplifier configured to differentially amplify first and second input signals forming an input differential pair to generate first and second intermediate signals forming a pair; and first and second class AB amplifiers configured to amplify the first and second intermediate signals to generate first and second output signals, respectively. The first and second output signals form an output differential pair, the first class AB amplifier amplifies the first intermediate signal based on a reference voltage adjusted by a first feedback signal that is a common mode component of the first output signal and the second output signal. The second class AB amplifier amplifies the second intermediate signal based on a reference voltage adjusted by a second feedback signal that is a common mode component of the first output signal and the second output signal. COPYRIGHT: (C)2011,JPO&INPIT
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