| 摘要 |
A novel amplifier circuit having a wide output signal amplitude range and a small current consumption is disclosed. A signal conversion circuit converts the input signal thereof into a first current signal. A current calculation circuit calculates the difference between a predetermined current value and the first current signal. A current amplifier circuit amplifies the difference current. Since the difference current calculated by the current calculation circuit is amplified, the dynamic range of the output can be widened with a small current flowing in the signal conversion circuit and the current calculation circuit. Further, this amplifier circuit, if designed to supply no output current under no load, can reduce the current consumption since the only steady current that flows under that condition is the small one flowing in the signal conversion circuit and the current calculation circuit.
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